EMH-54/3-Q48N-C Series www.murata-ps.com Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters ORDERING GUIDE SUMMARY Model Vout Range Iout Range Vin Range Ripple/Noise Efficiency EMH-54/3-Q48 54V 0.2-3A 18-72V 250mVp-p 91.5% INPUT CHARACTERISTICS Parameter Typ. @ 25°C, full load Notes Voltage Range 18-72 Volts 48V nominal Input Current, full power 3.67 Amps VIN = 48V Turn On/start-up threshold 17.5 Volts Typical units Undervoltage Shutdown 17 Volts No load Input Current 40mA VIN = 48V OUTPUT CHARACTERISTICS Parameter Typ. @ 25°C, full load Notes Voltage 54 Volts ±2% Current 0.2 to 3 Amps 0.2A min load required Power Output 162 Watts Ripple & Noise 250mVp-p 20MHz bandwidth Line and Load Regulation ±0.125%/±0.2% Overcurrent Protection 4 Amps With hiccup auto-restart Overtemperature Protection +135°C FEATURES Efficiency (minimum) 89.5% „„ Industry-Standard “Half-Brick” footprint Efficiency (typical) 91.5% „„ 162W output power @ 24-72Vin GENERAL SPECIFICATIONS „„ Up to 91.5% Efficiency at 54V output (typical) Parameter Typ. @ 25°C, full load Notes Dynamic Load Response 300μsec 50-75-50% step to ±1 of final value „„ On/Off Control (Negative logic) Operating Temperature Range –40 to +85°C With baseplate, see derating curve „„ Monotonic startup into pre-bias output conditions Absolute Operating Temperature „„ Over-current, Output & Over-temperature –40 to +105°C Measured at Thermistor, see derating Range protection UL 60950-1, 2nd edition „„ Low output ripple and noise Safety Features CSA-C22.2 No.60950-1 and „„ Strong thermal derating characteristics IEC/EN60950-1 „„ Operational Temperature Range –40°C to +85°C PHYSICAL SPECIFICATIONS with baseplate Parameter Inches Millimeters „„ 2250V I/O isolation Open frame (no baseplate) 2.4 x 2.3 x 0.43 61 x 58.4 x 10.92 „„ Output short-circuit protection (hiccup technique) With baseplate 2.4 X 2.3 X 0.5 61.0 x 58.4 x 12.7 PRODUCT OVERVIEW The EMH-54/3-Q48N-C module offers 54V output at 3 The modules offer wide range input voltage of designed for demanding telecom, POE (power over amps in a Half Brick footprint DC/DC power converter. 18-72V. The EMH topology offers high efficiency up Ethernet), datacom, and networking applications. These compact modules measure 2.4˝ x 2.3˝ x 0.5˝ to 91.5%, good regulation, low ripple/noise, and a EMHs feature input filters, input under voltage, (61 x 58.4 x 12.7 mm) with baseplate and offer the fast dynamic load response. The module sup- output current limiting, short-circuit protection, and industry-standard Half-Brick footprint. The product is plies up to 162 Watts of power and isolation rated thermal shutdown. designed to fully comply with RoHS-6 directive. at 2250V for basic insulation. EMH models are For full details go to www.murata-ps.com/rohs www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 1 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters PERFORMANCE SPECIFICATIONS SUMMARY AND ORDERING GUIDE Output Input Dimensions Efficiency with IOUT IIN, no IIN, full Power R/N (mV pk-pk) Regulation (Max.) VOUT VIN Nom. Range baseplate (Amps, load load (Volts) (Volts) (Volts) Root Model ➀ (Inches) (Watts) Typ. Max. Line Load Min. Typ. Max.) (mA) (Amps) EMH-54/3-Q48 54 3 162 250 350 ±0.125% ±0.2% 48 18-72 40 3.67 89.5% 91.5% 2.4x2.3x0.5 ➀ Please refer to the full part number structure for additional ordering part numbers and options. ➂ Full power continuous output requires baseplate installation. Please refer to the derating curves. ➁ All specifications are typical at nominal line voltage and full load, +25ºC. unless otherwise noted. Units are tested with a 1uF ceramic external output capacitor and a 100uf and 2.2uF external input capacitor. PART NUMBER STRUCTURE EMH - 54 / 3 Q48 N B Lx C - - Ethernet-Module RoHS Hazardous Materials compliance Half Brick Series C = RoHS-6 (no lead), standard, does not claim EU exemption 7b – lead in solder Nominal Output Voltage Pin length option Maximum Output Current Blank = standard pin length 0.180 in. (4.6 mm) in Amps L1 = 0.110 in. (2.79 mm)* L2 = 0.145 in. (3.68 mm)* Baseplate Input Voltage Range: Blank = No baseplate, standard Q48 = 18-72 Volts (48V nominal) B = Baseplate installed Note: Some model combinations may On/Off Control Logic not be available. Contact Murata Power N = Negative logic, standard Solutions for availability. Customer Configured Part Numbers: 1. EMH-31310-C (special version of the EMH-54/3-Q48NB-C) a. Includes conformal coating b. Isolation tested to 2,828Vdc Input-to-Output per IEEE 1613 c. Pin length of 0.180 inches ±0.02 (4.6mm ±0.508) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 2 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters FUNCTIONAL SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS Conditions ➀ Minimum Typical/Nominal Maximum Units Input Voltage, Continuous Full power operation 0 72 Vdc Isolation Voltage Input to output tested 2250 Vdc Input Reverse Polarity None, install external fuse None Vdc On/Off Remote Control Power on or off, referred to -Vin 0 15 Vdc Output Power 0 164.32 W Current-limited, no damage, Output Current 0.2 3 A short-circuit protected Storage Temperature Range Vin = Zero (no power) -55 125 °C Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those listed in the Performance/Functional Specifications Table is not implied nor recommended. INPUT Operating voltage range ➁ 18 48 72 Vdc Turn On/Start-up threshold Rising input voltage 16.5 17.5 18 Vdc Ambient temperature > 60°C 19 Vdc Turn Off/Undervoltage lockout Tested at 2.6A 15 17 17.5 Vdc Turn-On/Turn-Off Hysteresis 1.0 1.05 1.2 Vdc Reverse Polarity Protection None, install external fuse None Vdc Recommended External Fuse Fast blow 20 A Internal Filter Type L-C Input current Full Load Conditions Vin = nominal 3.67 3.83 A Low line input current Vin @ Min. @2.6A 8.52 8.84 A 2 Inrush Transient 0.1 A -Sec. Short Circuit Input Current 250 350 mA No Load Input Current Iout = minimum, unit=ON 40 80 mA Shutdown Mode Input Current (Off, UV, OT) 5 10 mA Reflected (back) ripple current ➂ Measured at input with specified filter 40 80 mA, p-p GENERAL and SAFETY Efficiency Vin = 48V, full load 89.5 91.5 % Vin = 24V, full load 89.5 91.5 % Vin = 18V, full load 89.5 91 % Isolation Isolation Voltage: no baseplate Input to output, continuous 2250 Vdc Input to output, continuous 2250 Vdc Isolation Voltage: with baseplate Input to Baseplate, continuous 1500 Output to Baseplate, continuous 750 Insulation Safety Rating basic Isolation Resistance 100 Mohm Isolation Capacitance 5,000 pF Safety (Designed to meet the following UL-60950-1, CSA-C22.2 No.60950-1, Yes requirements) IEC/EN60950-1, 2nd Edition Per Telcordia SR332, issue 1 class 3, ground 6 Calculated MTBF 1.8+ Hours x 10 fixed, Tambient=+25°C DYNAMIC CHARACTERISTICS Fixed Switching Frequency 387 430 473 KHz Power On to Vout regulated 10-90% Startup Time 40 60 mS (50% resistive load) Startup Time Remote ON to 10% Vout (50% resistive load) 30 50 mS 50-75-50% load step, settling time to within Dynamic Load Response 300 450 µSec ±2% of Vout Dynamic Load Peak Deviation same as above ±1000 ±1250 mV FEATURES and OPTIONS Remote On/Off Control ➃ “N” suffix: Negative Logic, ON state ON = Pin grounded or external voltage -0.7 0.8 V Negative Logic, OFF state OFF = Pin open or external voltage 5 15 V Control Current open collector/drain 1 2 mA Base Plate “B” suffix www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 3 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters FUNCTIONAL SPECIFICATIONS (CONT.) OUTPUT Total Output Power See Derating 0.0 161.1 164.32 W Voltage Nominal Output Voltage No trim 52.626 53.7 54.774 Vdc Setting Accuracy At 50% load -2 2 % of Vnom. Output Voltage Range User-adjustable ➅ N/A % of Vnom. Overvoltage Protection Via magnetic feedback 65 67 Vdc Current Output Current Range: 24-72 Vin 0.2 3 3 A Output Current Range: 18-24 Vin 0.2 2.6 2.6 A Minimum Load 0.2 98% of Vnom., after warmup 3.2 3.9 4.7 A Current Limit Inception ➄ Short Circuit Hiccup technique, autorecovery within ±1% of Short Circuit Current 0.5 1 A Vout, non-latching Short Circuit Duration Output shorted to ground, no damage Continuous (remove short for recovery) Short circuit protection method Current limiting Regulation ➅ Line Regulation Vin=min. to max. Vout=nom., 50% load ±0.125 % Load Regulation Iout=min. to max. Vin=48V. ±0.2 % Ripple and Noise 5 Hz- 20 MHz BW 250 350 mV pk-pk Temperature Coefficient At all outputs 0.02 % of Vnom./°C Maximum Capacitive Loading Low ESR, resistive load 0 3300 μF MECHANICAL (Through Hole Models) Outline Dimensions (open frame) 2.4 x 2.3 x 0.43 Inches 61.0 x 58.4 x 10.92 mm Outline Dimensions (with baseplate) 2.4 X 2.3 X 0.5 Inches LxWxH (Please refer to outline drawing) 61.0 x 58.4 x 12.7 mm Weight (with baseplate) 2.3 Ounces 67.13 Grams Through Hole Pin Diameter See mechanical drawing 0.04 & 0.080 Inches 1.016 & 2.032 mm Through Hole Pin Material Copper alloy TH Pin Plating Metal and Thickness Nickel subplate 50 µ-inches Gold overplate 5 µ-inches Case or Baseplate Material Aluminum ENVIRONMENTAL Operating Ambient Temperature Range With derating -40 85 °C Operating Ambient Temperature Range with Maximum baseplate temperature: Converter deliv- -40 100 °C Baseplate ers full rated power at max baseplate temp. Absolute Operating Temperature Range Measured @ Thermistor or in the middle of baseplate -40 105 Storage Temperature Vin = Zero (no power) -40 125 °C Thermal Protection/Shutdown 125 135 140 °C Electromagnetic Interference External filter required B Class Conducted, EN55022/CISPR22 Radiated, EN55022/CISPR22 B Class RoHS rating RoHS-6 Notes ➀ Unless otherwise noted, all specifications are at nominal input voltage, nominal output voltage ➂ Input (back) ripple current is tested and specified over 5 Hz to 20 MHz bandwidth. Input filtering and full load. General conditions are +25° Celsius ambient temperature, near sea level altitude, is Cbus = 220 µF, Cin = 33 µF and Lbus = 12 µF. natural convection airflow. All models are tested and specified with an external 1 µF multi-layer ➃ The Remote On/Off Control is referred to -Vin. ceramic output capacitor. The external input capacitors are 100uF and 2.2uF ceramic. All capaci- ➄ Over-current protection is non-latching with auto reovery (Hiccup) tors are low-ESR types wired close to the converter. These capacitors are necessary for our test ➅ Regulation specifications describe the output voltage changes as the line voltage or load current equipment and may not be needed in the user’s application. is varied from its nominal or midpoint value to either extreme. ➁ The module will operate when input voltage is within the 18-72V Operating Voltage Range. Output regulation at full load will be achieved only when Vin ≥ 18V. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 4 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Maximum Current Temperature Derating vs. Airflow Maximum Current Temperature Derating vs. Airflow (Vin = 18, airflow from Pin 1 to Pin 4 on PCB, no Baseplate) (Vin = 24V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate) 4 4 3 3 2 2 0.33 m/s (65 LFM) 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 1 1 2.0 m/s (400 LFM) 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating vs. Airflow Maximum Current Temperature Derating vs. Airflow (Vin = 36, airflow from Pin 1 to Pin 4 on PCB, no Baseplate) (Vin = 48V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate) 4 4 3 3 0.33 m/s (65 LFM) 0.33 m/s (65 LFM) 2 2 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 1 1 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating vs. Airflow Maximum Current Temperature Derating vs. Airflow (Vin = 60, airflow from Pin 1 to Pin 4 on PCB, no Baseplate) (Vin = 72V, airflow from from Pin 1 to Pin 4 on PCB, no Baseplate) 4 4 3 3 0.33 m/s (65 LFM) 2 2 0.5 m/s (100 LFM) 0.33 m/s (65 LFM) 1.0 m/s (200 LFM) 0.5 m/s (100 LFM) 1.5 m/s (300 LFM) 1.0 m/s (200 LFM) 2.0 m/s (400 LFM) 1.5 m/s (300 LFM) 1 1 2.0 m/s (400 LFM) 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 5 of 15 Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Maximum Current Temperature Derating vs. Airflow Maximum Current Temperature Derating vs. Airflow (Vin = 18, airflow from Pin 1 to Pin 4 on PCB, with Baseplate) (Vin = 24V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate) 4 4 3 3 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 2 0.33 m/s (65 LFM) 2 1.0 m/s (200 LFM) 0.5 m/s (100 LFM) 1.5 m/s (300 LFM) 1.0 m/s (200 LFM) 2.0 m/s (400 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 1 1 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating vs. Airflow Maximum Current Temperature Derating vs. Airflow (Vin = 36, airflow from Pin 1 to Pin 4 on PCB, with Baseplate) (Vin = 48V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate) 4 4 3 3 0.33 m/s (65 LFM) 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 0.5 m/s (100 LFM) 2 2 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 1 1 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) Maximum Current Temperature Derating vs. Airflow Maximum Current Temperature Derating vs. Airflow (Vin = 60, airflow from Pin 1 to Pin 4 on PCB, with Baseplate) (Vin = 72V, airflow from from Pin 1 to Pin 4 on PCB, with baseplate) 4 4 3 3 0.33 m/s (65 LFM) 0.33 m/s (65 LFM) 0.5 m/s (100 LFM) 2 2 0.5 m/s (100 LFM) 1.0 m/s (200 LFM) 1.0 m/s (200 LFM) 1.5 m/s (300 LFM) 1.5 m/s (300 LFM) 2.0 m/s (400 LFM) 2.0 m/s (400 LFM) 1 1 0 0 30 35 40 45 50 55 60 65 70 75 80 85 30 35 40 45 50 55 60 65 70 75 80 85 Ambient Temperature (°C) Ambient Temperature (°C) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 6 of 15 Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) Output Current (Amps) EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Efficiency vs Line Voltage and Load Current @ +25°C Startup Delay (Vin=48V, Iout=3A, Ta=+25°C) Trace 1=Vin, Trace 4=Vout. 92 91 90 89 88 87 86 Vin = 18V 85 Vin = 24V 84 Vin = 36V 83 Vin = 48V 82 Vin = 60V 81 Vin = 75V 80 79 78 77 76 75 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 2.2 2.4 2.6 2.8 3 Load Current (Amps) On/Off Enable Delay (Vin=48V, Iout=3A, Ta=+25°C) Trace 1=Enable, Trace 4=Vout. Stepload Transient Response (Vin=48V, Iout =50-75-50%, Ta=+25°C) Output Ripple and Noise (Vin=48V, Vout=nom, Iout=0A, Cload=1uF, Ta=+25°C) Output Ripple and Noise (Vin=48V, Vout=nom, Iout=3A, Cload=1uF, Ta=+25°C) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 7 of 15 Efficiency (%) EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters TYPICAL PERFORMANCE DATA Thermal image with hot spot at 2.9A with 25°C ambient temperature. Natural convention is used with no forced airflow. Identifiable and recommended maximum value to be verified in application. Vin=48V, T3 and Q12 max temp=128°C/IPC9592 guidelines. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 8 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters MECHANICAL SPECIFICATIONS – OPEN FRAME 1.900 [48.26] MOUNTING PLANE (PIN SHOULDERS) 1 9 0.700 0.700 [17.78] [17.78] 2.40 [60.96] C 1.400 L 0.300 [35.56] [7.62] 3 4 5 2x .080 PINS 5 & 9 3x .040 0.95 PINS 1, 3 & 4 2.300 [24.1] [58.42] C L TOP VIEW SIDE VIEW BOTTOM VIEW 0.43 [10.92] END VIEW Dimensions are in inches (mm shown for ref. only). INPUT/OUTPUT CONNECTIONS Pin Function Third Angle Projection 1 Negative Input 2 Omitted 3 Remote On/Off 4 Positive Input Tolerances (unless otherwise specified): 5 Positive Output .XX ± 0.02 (0.5) .XXX ± 0.010 (0.25) 6 Omitted Angles ± 2˚ 7 Omitted Components are shown for reference only. 8 Omitted 9 Negative Output MATERIAL: FINISH: (ALL PINS) .080 PINS: COPPER ALLOY .040 PINS: COPPER ALLOY FINISH: (ALL PINS) GOLD (5u”MIN) OVER NICKEL (50u” MIN) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 9 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters MECHANICAL SPECIFICATIONS – WITH BASEPLATE [58.4] Dimensions are in inches (mm shown for ref. only). 2.30 Third Angle Projection [61.0] 2.000 2.40 Tolerances (unless otherwise specified): TOP VIEW [50.8] .XX ± 0.02 (0.5) 0.112-40-UNC-2B .XXX ± 0.010 (0.25) 0.25 MIN DEEP (4 PLS) Angles ± 2˚ Components are shown for reference only. 1.900 [48.26] ALUMINUM BASEPLATE END VIEW 0.015 [.381] MIN [12.7±0.38] CLEARANCE 0.5±.015 MTG PLANE SIDE VIEW 0.071 .002 VENTED SHOULDER AT EACH 0.080±.002 0.040±.002 (PINS 5 & 9) (PINS 1, 3-4) 1.900 INPUT/OUTPUT CONNECTIONS [48.26] Pin Function PIN 9 1 Negative Input PIN 1 2 Omitted 3 Remote On/Off 4 Positive Input 5 Positive Output PIN 3 1.400 6 Omitted C 0.300 [35.56] L [7.62] 0.700 PIN 4 7 Omitted [17.78] 8 Omitted 9 Negative Output PIN 5 [24.1] 0.95 C L PIN 1 BOTTOM VIEW MATERIAL: .040 PINS: COPPER ALLOY .080 PINS: COPPER ALLOY FINISH: (ALL PINS) ISOMETRIC VIEW GOLD (5u"MIN) OVER NICKEL (50u" MIN) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 10 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters RECOMMENDED FOOTPRINT (VIEW THROUGH CONVERTER) Dimensions are in inches (mm shown for ref. only). TOP VIEW Third Angle Projection 58.9 2.32 FINISHED HOLE SIZES @ PINS 1, 3 AND 4 .150MIN (PER IPC-D-275, LEVEL C) @5 & 9 FOR PIN .048-.062 Tolerances (unless otherwise specified): SHOULDERS .XX ± 0.02 (0.5) (PRI) (SEC) .XXX ± 0.010 (0.25) Angles ± 2˚ Components are shown for reference only. 4 5 17.78 61.5 .700 2.42 7.62 3 .300 C C L L .100 MIN 35.56 @ 1, 3, AND 4 1.400 FOR PIN SHOULDERS 1 9 24.13 .950 FINISHED HOLE SIZES C L @ PINS 5 & 9 (PER IPC-D-275, LEVEL C) 48.26 .088-.102 1.900 IT IS RECOMMENDED THAT NO PARTS BE PLACED BENEATH CONVERTER STANDARD PACKAGING Each static dissipative polyethylene foam tray accommodates 9 converters in a 3 x 3 array Carton inside dimensions: 10" x 10" x 4.25" (4 trays of 9) www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 11 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters Sometimes only a small ceramic capacitor is sufficient. Since it is difficult to TECHNICAL NOTES totally characterize all applications, some experimentation may be needed. Input Fusing Note that external input capacitors must accept high speed switching currents. Certain applications and/or safety agencies may require fuses at the inputs of Because of the switching nature of DC/DC converters, the input of these power conversion components. Fuses should also be used when there is the converters must be driven from a source with both low AC impedance and possibility of sustained input voltage reversal which is not current-limited. For adequate DC input regulation. Performance will degrade with increasing input greatest safety, we recommend a fast blow fuse installed in the ungrounded inductance. Excessive input inductance may inhibit operation. The DC input input supply line. regulation specifies that the input voltage, once operating, must never degrade The installer must observe all relevant safety standards and regulations. For below the Shut-Down Threshold under all load conditions. Be sure to use safety agency approvals, install the converter in compliance with the end-user adequate trace sizes and mount components close to the converter. safety standard, i.e. IEC/EN/UL 60950-1. I/O Filtering, Input Ripple Current and Output Noise Input Reverse-Polarity Protection All models in this converter series are tested and specified for input reflected If the input voltage polarity is reversed, an internal diode will become forward ripple current and output noise using designated external input/output compo- biased and likely draw excessive current from the power source. If this source nents, circuits and layout as shown in the figures below. External input capacitors is not current-limited or the circuit appropriately fused, it could cause perma- (Cin in the figure) serve primarily as energy storage elements, minimizing line nent damage to the converter. voltage variations caused by transient IR drops in the input conductors. Users should select input capacitors for bulk capacitance (at appropriate frequen- Input Under-Voltage Shutdown and Start-Up Threshold cies), low ESR and high RMS ripple current ratings. In the figure below, the Cbus Under normal start-up conditions, converters will not begin to regulate properly and Lbus components simulate a typical DC voltage bus. Your specific system until the ramping-up input voltage exceeds and remains at the Start-Up configuration may require additional considerations. Please note that the values Threshold Voltage (see Specifications). Once operating, converters will not of Cin, Lbus and Cbus will vary according to the specific converter model. turn off until the input voltage drops below the Under-Voltage Shutdown Limit. Subsequent restart will not occur until the input voltage rises again above the Start-Up Threshold. This built-in hysteresis prevents any unstable on/off opera- TO tion at a single input voltage. CURRENT OSCILLOSCOPE PROBE Users should be aware however of input sources near the Under-Voltage +INPUT Shutdown whose voltage decays as input current is consumed (such as capac- LBUS + itor inputs), the converter shuts off and then restarts as the external capacitor – VIN CBUS CIN recharges. Such situations could oscillate. To prevent this, make sure the + operating input voltage is well above the UV Shutdown voltage AT ALL TIMES. – -INPUT Start-Up Time CIN = 33µF, ESR < 700mΩ @ 100kHz Assuming that the output current is set at the rated maximum, the Vin to Vout CBUS = 220µF, ESR < 100mΩ @ 100kHz Start-Up Time (see Specifications) is the time interval between the point when LBUS = 12µH the ramping input voltage crosses the Start-Up Threshold and the fully loaded regulated output voltage enters and remains within its specified accuracy band. Figure 1. Measuring Input Ripple Current Actual measured times will vary with input source impedance, external input capacitance, input voltage slew rate and final value of the input voltage as it In critical applications, output ripple and noise (also referred to as periodic appears at the converter. and random deviations or PARD) may be reduced by adding filter elements These converters include a soft start circuit, which limits the duty cycle of such as multiple external capacitors. Be sure to calculate component tem- the PWM controller at power up, thereby limiting the input inrush current. perature rise from reflected AC current dissipated inside capacitor ESR. Our The On/Off Remote Control interval from On command to Vout regulated Application Engineers can recommend potential solutions. assumes that the converter already has its input voltage stabilized above the Start-Up Threshold before the On command. The interval is measured from the Floating Outputs On command until the output enters and remains within its specified accuracy Since these are isolated DC/DC converters, their outputs are “floating” with band. The specification assumes that the output is fully loaded at maximum respect to their input. The essential feature of such isolation is ideal ZERO rated current. Similar conditions apply to the On to Vout regulated specification CURRENT FLOW between input and output. Real-world converters however do such as external load capacitance and soft start circuitry. exhibit tiny leakage currents between input and output (see Specifications). These leakages consist of both an AC stray capacitance coupling component Input Source Impedance and a DC leakage resistance. When using the isolation feature, do not allow These converters will operate to specifications without external components, the isolation voltage to exceed specifications. Otherwise the converter may assuming that the source voltage has very low impedance and reason- be damaged. Designers will normally use the negative output (-Output) as able input voltage regulation. Since real-world voltage sources have finite the ground return of the load circuit. You can however use the positive output impedance, performance is improved by adding external filter components. (+Output) as the ground return to effectively reverse the output polarity. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 12 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters sensing circuit will power down the unit, and the output voltage will decrease. After a time-out period, the PWM will automatically attempt to restart, causing the output voltage to ramp up to its rated value. It is not necessary to power 5 +OUTPUT down and reset the converter for this automatic OVP-recovery restart. If the fault condition persists and the output voltage climbs to excessive RLOAD levels, the OVP circuitry will initiate another shutdown cycle. This on/off cycling C1 SCOPE is referred to as “hiccup” mode. 9 -OUTPUT Output Fusing The converter is extensively protected against current, voltage and temperature extremes. However your output application circuit may need additional protec- C1 = 1µF CERAMIC tion. In the extremely unlikely event of output circuit failure, excessive voltage LOAD 2-3 INCHES (51-76mm) FROM MODULE could be applied to your circuit. Consider using an appropriate fuse in series Figure 2. Measuring Output Ripple and Noise (PARD) with the output. Output Current Limiting Thermal Shutdown As soon as the output current increases to its maximum rated value, the DC/DC To prevent many over temperature problems and damage, these converters converter will enter a power-limiting mode. The output voltage will decrease include thermal shutdown circuitry. If environmental conditions cause the proportionally with increases in output current, thereby maintaining a some- temperature of the DC/DC’s to rise above the Operating Temperature Range what constant power output. This is commonly referred to as power limiting. up to the shutdown temperature, an on-board electronic temperature sensor Current limiting inception is defined as the point at which full power falls will power down the unit. When the temperature decreases below the turn-on below the rated tolerance. See the Performance/Functional Specifications. Note threshold, the converter will automatically restart. There is a small amount of particularly that the output current may briefly rise above its rated value. This hysteresis to prevent rapid on/off cycling. The temperature sensor is typically enhances reliability and continued operation of your application. If the output located adjacent to the switching controller, approximately in the center of the current is too high, the converter will enter the short circuit condition. unit. See the Performance and Functional Specifications. Output Short Circuit Condition CAUTION: If you operate too close to the thermal limits, the converter may When a converter is in power-limit mode, the output voltage will drop as the shut down suddenly without warning. Be sure to thoroughly test your applica- output current demand increases. If the output voltage drops too low, the mag- tion to avoid unplanned thermal shutdown. netically coupled voltage used to develop primary side voltages will also drop, Temperature Derating Curves thereby shutting down the PWM controller. Following a time-out period, the The graphs in this data sheet illustrate typical operation under a variety of PWM will restart, causing the output voltage to begin ramping up to its appro- conditions. The derating curves show the maximum continuous ambient air priate value. If the short-circuit condition persists, another shutdown cycle will temperature and decreasing maximum output current which is acceptable initiate. This on/off cycling is called “hiccup mode”. The hiccup cycling reduces under increasing forced airflow measured in Linear Feet per Minute (“LFM”). the average output current, thereby preventing excessive internal tempera- Note that these are AVERAGE measurements. The converter will accept brief tures. A short circuit can be tolerated indefinitely. increases in temperature and/or current or reduced airflow as long as the aver- Remote On/Off Control age is not exceeded. Negative: Optional negative-logic devices are on (enabled) when the On/Off is Note that the temperatures are of the ambient airflow, not the converter grounded or brought to within a low voltage (see Specifications) with respect itself which is obviously running at higher temperature than the outside air. Also to –Vin. The device is off (disabled) when the On/Off is pulled high to +Vin with note that very low flow rates are similar to “natural convection,” that is, not respect to –Vin. using fan-forced airflow. Dynamic control of the On/Off function should be able to sink appropriate Murata Power Solutions makes characterization measurements in a closed signal current when brought low and withstand appropriate voltage when loop wind tunnel with measured airflow. We use both thermocouples and an brought high. Be aware too that there is a finite time in milliseconds (see infrared camera system to observe thermal performance. If in doubt, contact Specifications) between the time of On/Off Control activation and stable, Murata Power Solutions to discuss placement and measurement techniques of regulated output. This time will vary slightly with output load type and current suggested temperature sensors. and input conditions. CAUTION: If you routinely or accidentally exceed these Derating guidelines, There are two CAUTIONs for the On/Off Control: the converter may have an unplanned Over Temperature shut down. Also, these CAUTION: While it is possible to control the On/Off with external logic if you graphs are all collected at slightly above Sea Level altitude. Be sure to reduce carefully observe the voltage levels, the preferred circuit is either an open the derating for higher density altitude. drain/open collector transistor or a relay (which can thereupon be controlled by Output Overvoltage Protection logic). This converter monitors its output voltage for an over-voltage condition using CAUTION: Do not apply voltages to the On/Off pin when there is no input an on-board electronic comparator. If the output exceeds OVP limits, the voltage. Otherwise the converter may be permanently damaged. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 13 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters Soldering Guidelines Murata Power Solutions recommends the specifications below when installing these converters. These specifications vary depending on the solder type. Exceeding these +VIN +VCC specifications may cause damage to the product. Be cautious when there is high atmo- spheric humidity. We strongly recommend a mild pre-bake (100° C. for 30 minutes). Your production environment may differ; therefore please thoroughly review these guidelines with your process engineers. ON/OFF CONTROL Wave Solder Operations for through-hole mounted products (THMT) For Sn/Ag/Cu based solders: For Sn/Pb based solders: Maximum Preheat Temperature 115° C. Maximum Preheat Temperature 105° C. –VIN Maximum Pot Temperature 270° C. Maximum Pot Temperature 250° C. Maximum Solder Dwell Time 7 seconds Maximum Solder Dwell Time 6 seconds Figure 3. Driving the Negative Logic On/Off Control Pin Power Over Ethernet (PoE) Power over Ethernet (PoE) supports the implementation of the IEEE 802.3af and IEEE 802.3at standards; this implementation allows both data and electrical power to pass over a copper Ethernet LAN cable. PoE permits electric power, along with data, to be passed over a copper Ethernet LAN cable. Powered devices, such as voice-over-IP telephones, wireless access points, video cam- eras, and point-of-sale devices, that support PoE can receive power safely from the access ports that are used to connect personal computers to the network. IEEE 802.3at increases the amount of power to 30W. The PoE standard provides support for legacy PoE devices. An IEEE 802.af powered device can operate normally when connected to IEEE 802.at power sourcing equipment. Maximum Power Power range of Standard Class delivered by PoE port powered device 0 15.4 W 0.44 through 12.95 W IEEE 802.3af (PoE) 1 4 W 0.44 through 3.84 W and IEEE 802.3at (PoE +) 2 7.0 W 3.84 through 6.49 W 3 15.4 W 6.49 through 12.95 W IEEE 802.3at (PoE+) 4 30.0 W 12.95 through 25.5 W Table 1. Class of Powered Device and Power Levels www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 14 of 15 EMH-54/3-Q48N-C Series Isolated, 54Vout, 3A, Ethernet Power Half-Brick DC/DC Converters Vertical Wind Tunnel Murata Power Solutions employs a computer controlled custom-designed closed loop vertical wind tunnel, infrared video camera system, and test instrumentation for accurate airflow and heat dissipation analysis of power products. The system includes a precision low flow-rate anemometer, IR Transparent optical window variable speed fan, power supply input and load controls, Variable temperature gauges, and adjustable heating element. Unit under speed fan test (UUT) The IR camera monitors the thermal performance of the Unit Under Test (UUT) under static steady-state conditions. A IR Video special optical port is used which is transparent to infrared Camera wavelengths. Both through-hole and surface mount converters are soldered down to a host carrier board for realistic heat absorption and spreading. Both longitudinal and transverse airflow studies are possible by rotation of this carrier board Heating since there are often significant differences in the heat element dissipation in the two airflow directions. The combination of Precision adjustable airflow, adjustable ambient heat, and adjustable low-rate Input/Output currents and voltages mean that a very wide anemometer range of measurement conditions can be studied. 3” below UUT The collimator reduces the amount of turbulence adjacent to the UUT by minimizing airflow turbulence. Such turbu- lence influences the effective heat transfer characteristics Ambient and gives false readings. Excess turbulence removes more temperature heat from some surfaces and less heat from others, possibly sensor causing uneven overheating. Both sides of the UUT are studied since there are differ- Airflow ent thermal gradients on each side. The adjustable heating collimator element and fan, built-in temperature gauges, and no-contact IR camera mean that power supplies are tested in real-world conditions. Figure 4. Vertical Wind Tunnel This product is subject to the following operating requirements Murata Power Solutions, Inc. and the Life and Safety Critical Application Sales Policy: 11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A. Refer to: http://www.murata-ps.com/requirements/ ISO 9001 and 14001 REGISTERED Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without notice. © 2017 Murata Power Solutions, Inc. www.murata-ps.com/support MDC_EMH-54/3-Q48N-C.A06 Page 15 of 15