ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Input Range (Vdc) Model Number Vout Iout (Vdc) (A) Min Max ICF0184V1xC 9 36 12 84 ICF0442V1xC 9 36 24 42 ICF0536V1xC 9 36 28 36 ICF0621V1xC 9 36 48 21 ICF0719V1xC 9 36 53 19 Features
4:1 Input voltage range of 9-36V
Single outputs of 12V, 24V, 28V, 48V or 53V
2250Vdc Isolation voltage (Input-to-Output)
Industry Standard full brick package 4.7" x 2.5" x 0.52" (119mm x 64mm x 13.2mm)
Efficiency up to 96%
Excellent thermal performance
Over-Current and Short Circuit Protection
Over-Temperature protection
Monotonic startup into pre-bias loads
400kHz Fixed switching frequency
Remote On/Off control (Positive or Negative logic)
External Trim adjust and Remote Sense functions
Operating Temp. Range -40°C to +105°C
RoHS Compliant Product Overview for extended temperature operation. The 4:1 input voltage 1000 Watt single output ICF DC-DC converter provides a precisely regulated dc output. The output The converter’s high efficiency and high power density are voltage is fully isolated from the input, allowing the output to be accomplished through use of high-efficiency synchronous positive or negative polarity and with various ground rectification technology, advanced electronic circuit, connections. The enclosed full brick package meets the most packaging and thermal design thus resulting in a high rigorous performance standards in an industry standard reliability product. The converter operates at a fixed frequency footprint for process control (24Vin), and Commercial-Off-The- of 400kHz and follows conservative component derating Shelf (28Vin) applications. guidelines. The ICF Series includes an external TRIM adjust, Remote Product is designed and manufactured in the USA. Sense and remote ON/OFF control. Threaded through holes are provided to allow easy mounting or the addition of a heat sink Part Number Structure and Ordering Guide Description Part Number Structure Definition and Options Product Family I C IC= Industrial Class Form Factor F F = Full Brick Vout* 0 4 01 = 12Vout, 04 = 24Vout, 05 = 28Vout, 06 = 48Vout, 07 = 53Vout Output Current 4 2 Max Iout in Amps Vin Range V 1 V1 = 9 to 36V On/Off Control Logic P N = Negative, P = Positive (Standard) Specific Customer Configuration Customer Code, Omit for Standard X X RoHS Compliant C RoHS 6/6 Compliant *NOTE: Some part number combinations might not be available. Please contact the factory for non-standard or special order products. www.murata-ps.com/support MDC_ICF_A08 Page 1 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Electrical Specifications – All Models Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24VDC, unless otherwise specified. Specifications are subject to change without notice. A Parameter Notes Min Typ Max Units Absolute Maximum Ratings Input Voltage Continuous 0 40 V Transient (100ms) 50 V Operating Temperature (See Note 1) Baseplate (100% load) Standard model -40 105 °C Storage Temperature -55 125 °C Isolation Characteristics and Safety Isolation Voltage Input to Output 2250 Vdc Input to Baseplate & Output to Baseplate 1500 Vdc Isolation Capacitance 9000 pF Isolation Resistance 10 20 MΩ Insulation Safety Rating Basic Agency Approvals Designed to meet UL/cUL 60950, IEC/EN 60950-1 Feature Characteristics Fixed Switching Frequency 200 kHz Input Current and Output Voltage Ripple 400 kHz Output Voltage Trim Range Adjustable via TRIM (Pin 12) 60 110 % Between each SENSE input and its corresponding Remote Sense Compensation 1 V OUT pin Non-latching Output Overvoltage Protection 114 122 130 % Overtemperature Shutdown (Baseplate) Non-latching (Vin=9V; 12V, 24/36V) 108 112 115 °C Auto-Restart Period Applies to all protection features 1.7 2 2.3 s Time from UVLO to Vo=90%V (NOM) OUT 480 517 530 ms Turn-On Time from Vin Resistive load 20 27 35 ms ICF0442V1 and ICF0536V1 Turn-On Time from ON/OFF Control Time from ON to Vo=90%VOUT(NOM) Resistive load ICF0621V1 and ICF0719V1 20 35 50 ms 4 ICF0442V1 and ICF0536V1 7 11 ms Rise Time Vout from 10% to 90% ICF0621V1 and ICF0719V1 7 15 25 ms ON/OFF Control – Positive Logic ON state Pin open = ON or 2 12 V Control Current Leakage current 0.16 mA OFF state 0 0.8 V Control current Sinking 0.3 0.36 mA ON/OFF Control – Negative Logic ON state Pin shorted to – ON/OFF pin or 0 0.8 V OFF state Pin open = OFF or 2 12 V Thermal Characteristics Converter soldered to 5” x 3.5” x 0.07”, Thermal resistance Baseplate to Ambient 3.3 °C/W 4 layer/2Oz copper FR4 PCB. 1. A thermal management device, such as a heatsink, is required to ensure proper operation of this device. The thermal management medium is required to maintain baseplate < 105ºC for full rated power. www.murata-ps.com/support MDC_ICF_A08 Page 2 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Electrical Specifications - ICF0184V1xC Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s) and 0.9” heatsink, Vin = 14VDC, unless otherwise specified. Specifications are subject to change A without notice. Parameter Notes Min Typ Max Units Input Characteristics 9 14 36 V Operating Input Voltage Range Input Under Voltage Lockout Non-latching 8.2 8.5 8.8 V Turn-on Threshold 7.7 8.0 8.3 V Turn-off Threshold Lockout Hysteresis Voltage 0.4 0.55 0.7 V 89 A Maximum Input Current Vin = 9V, 80% Load 92 A Vin = 12V, 100% Load 600 Vin = 14V, Output Shorted mA RMS Input Stand-by Current Converter Disabled 2 4 mA Input Current @ No Load Converter Enabled 450 690 550 mA 1) Minimum Input Capacitance (external) See Table 1 1000 μF 2 Inrush Transient 0.19 A s A Input Terminal Ripple Current, iC 25 MHz bandwidth, 100% Load (Fig. 5) 3.65 RMS Output Characteristics Output Voltage Range 11.64 12.00 12.36 V Output Voltage Set Point Accuracy (No load) 11.90 12.00 12.10 V Output Regulation Vin = 9V to 36V Over Line 0.05 0.10 % Vin = 14V, Load 0% to 100% Over Load 0.05 0.150 % Temperature Coefficient 0.005 0.015 %/ºC 14 15.6 V Overvoltage Protection 120 mV 100% Load, PK-PK Output Ripple and Noise – 20 MHz bandwidth See Table 1 for external components 40 mVRMS 1) External Load Capacitance See Table 1 Vin = 12V – 36V 0 84 Output Current Range (See Fig. A) A 0 67.2 Vin = 9V A Vin = 12V – 36V 92.4 100.8 109.2 Current Limit Inception A 9V ≤ Vin < 12V 73.5 109.2 A Non-latching, Continuous 7 RMS Short-Circuit Current ARMS Dynamic Response Load Change 50%-100%-50%, di/dt = 0.5A/μs Co = 2 x 470 μF/70mΩ ±500 mV Settling Time to 1% of V 800 OUT μs Efficiency Vin = 14V 93.0 % 100% Load Vin = 12V 92.3 % Vin = 14V 95.4 % 50% Load Vin = 12V 95.0 % 1) Section “Input and Output Capacitance” www.murata-ps.com/support MDC_ICF_A08 Page 3 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Electrical Specifications - ICF0442V1xC Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24VDC, unless otherwise specified. Specifications are subject to change without notice. A Parameter Notes Min Typ Max Units Input Characteristics 9 24 36 V Operating Input Voltage Range Input Under Voltage Lockout Non-latching Turn-on Threshold 8.2 8.5 8.8 V 7.7 8.0 8.3 V Turn-off Threshold Lockout Hysteresis Voltage 0.4 0.55 0.7 V 89 A Maximum Input Current Vin = 9V, 80% Load 92 A Vin = 12V, 100% Load 350 Vin = 24V, Output Shorted mARMS Input Stand-by Current Converter Disabled 2 4 mA Input Current @ No Load Converter Enabled 330 530 420 mA 1) Minimum Input Capacitance (external) ESR < 0.1 Ω μF 1000 2 Inrush Transient 0.19 A s Input Terminal Ripple Current, i 3.65 A C 25 MHz bandwidth, 100% Load (Fig. 5) RMS Output Characteristics Output Voltage Range 23.62 24.00 24.36 V Output Voltage Set Point Accuracy (No load) 23.90 24.00 24.10 V Output Regulation Over Line Vin = 9V to 36V 0.05 0.10 % Vin = 24V, Load 0% to 100% Over Load 0.05 0.10 % Temperature Coefficient 0.005 0.015 %/ºC 27.36 31.2 V Overvoltage Protection 200 320 (Fig. 6) 100% Load, mV PK-PK Output Ripple and Noise – 20 MHz bandwidth See Table 1 for external components 50 80 mVRMS 1000 4700 μF 1) Full Load (resistive) C EXT External Load Capacitance (over operating temp range) ESR 10 100 mΩ Vin = 12V – 36V 0 42 Output Current Range (See Fig. A) A 0 33.5 Vin = 9V A Vin = 12V – 36V 46 50.2 54.6 Current Limit Inception A 9V ≤ Vin < 12V 37 49 54.6 A Non-latching, Continuous 2.0 3.1 6.5 RMS Short-Circuit Current A RMS Dynamic Response ±400 ±600 Load Change 50%-75%-50%, di/dt = 1A/μs Co = 2 x 470 μF/70mΩ mV ±700 Load Change 50%-100%-50%, di/dt = 1A/μs Co = 2 x 470 μF/70mΩ mV Settling Time to 1% of V 500 OUT μs Efficiency Vin = 24V 93.6 94.6 95.3 % 100% Load Vin = 12V 92.4 93.4 94.0 % Vin = 24V 95.0 96.0 96.4 % 50% Load Vin = 12V 94.7 95.7 96.3 % 1) Section “Input and Output Capacitance” www.murata-ps.com/support MDC_ICF_A08 Page 4 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Electrical Specifications - ICF0536V1xC Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24VDC, unless otherwise specified. Specifications are subject to change without notice. A Parameter Notes Min Typ Max Units Operating Input Voltage Range 9 24 36 V Input Under Voltage Lockout Non-latching Turn-on Threshold V 8.2 8.5 8.8 Turn-off Threshold 7.7 8.0 8.3 V Lockout Hysteresis Voltage 0.4 0.55 0.7 V Vin = 9V, 80% Load 89 Maximum Input Current A Vin = 12V, 100% Load 92 A Vin = 24V, Output Shorted 330 mARMS Input Stand-by Current Converter Disabled 2 4 mA Input Current @ No Load Converter Enabled 400 480 600 mA 1) Minimum Input Capacitance (external) ESR < 0.1 Ω 1000 μF 2 Inrush Transient 0.19 A s Input Reflected-Ripple Current, i 25 MHz bandwidth, 100% Load (Fig. 5) 2.5 A C RMS Output Characteristics 27.56 28.00 28.42 Nominal Output Voltage V Output Voltage Set Point Accuracy (No load) 27.90 28.00 28.10 V Output Regulation Over Line 0.05 0.10 Vin = 9V to 36V % Vin = 24V, Load 0% to 100% 0.05 0.10 Over Load % 0.005 0.015 Temperature Coefficient %/ºC 31.9 36.4 Overvoltage Protection V 220 360 mV PK-PK (Fig. 6) 100% Load, Output Ripple and Noise – 20 MHz bandwidth See Table 1 for external components 50 80 mV RMS 1000 4700 μF 1) Full Load (resistive) C EXT External Load Capacitance (over operating temp range) ESR mΩ 10 100 Output Current Range (See Fig. A) Vin = 12V – 36V 0 36 A 0 28.8 A Vin = 9V Vin = 12V – 36V 39.6 46.8 Current Limit Inception A 9V ≤ Vin < 12V 31.7 46.8 A RMS Short-Circuit Current Non-latching 1.7 2.5 6.4 A RMS Dynamic Response Load Change 50%-75%-50%, di/dt = 1A/μs ±330 ±430 See Table 1 for external components mV ±600 Load Change 50%-100%-50%, di/dt = 1A/μs See Table 1 for external components mV Settling Time to 1% of V 500 μs OUT Efficiency Vin = 24V 94.5 95.5 96.2 % 100% Load Vin = 12V 93.0 93.8 94.5 % Vin = 24V 95.5 96.2 97.0 % 50% Load Vin = 12V 94.3 95.4 96.2 % 1) Section “Input and Output Capacitance” www.murata-ps.com/support MDC_ICF_A08 Page 5 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Electrical Specifications - ICF0621V1xC Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24VDC, unless otherwise specified. Specifications are subject to change without notice. A Parameter Notes Min Typ Max Units Input Characteristics 9 24 36 V Operating Input Voltage Range Input Under Voltage Lockout Non-latching Turn-on Threshold 8.2 8.5 8.8 V 7.7 8.0 8.3 V Turn-off Threshold Lockout Hysteresis Voltage 0.4 0.55 0.7 V 89 A Maximum Input Current Vin = 9V, 80% Load 92 A Vin = 12V, 100% Load 400 Vin = 24V, Output Shorted mARMS Input Stand-by Current Converter Disabled 2 4 mA Input Current @ No Load Converter Enabled 370 560 470 mA 1) Minimum Input Capacitance (external) ESR < 0.1 Ω μF 1000 2 Inrush Transient 0.19 A s Input Terminal Ripple Current, i 0.9 A C 25 MHz bandwidth, 100% Load (Fig. 5) RMS Output Characteristics Output Voltage Range 47.28 48.00 48.92 V Output Voltage Set Point Accuracy (No load) 47.80 48.00 48.20 V Output Regulation Over Line Vin = 9V to 36V 0.05 0.10 % Vin = 24V, Load 0% to 100% Over Load 0.05 0.10 % Temperature Coefficient 0.005 0.015 %/ºC 54.7 62.4 V Overvoltage Protection 100 150 (Fig. 6) 100% Load, mV PK-PK Output Ripple and Noise – 20 MHz bandwidth See Table 1 for external components 25 50 mVRMS 470 3000 μF 1) Full Load (resistive) C EXT External Load Capacitance (over operating temp range) ESR 10 100 mΩ Vin = 12V – 36V 0 21 Output Current Range (See Fig. A) A 0 16.8 Vin = 9V A Vin = 12V – 36V 23.1 25.2 27.3 Current Limit Inception A 9V ≤ Vin < 12V 18.48 20.16 27.3 A Non-latching, Continuous 1.0 1.6 3.3 RMS Short-Circuit Current A RMS Dynamic Response ±480 ±560 Load Change 50%-75%-50%, di/dt = 1A/μs See Table 1 for external components mV ±880 ±1150 Load Change 50%-100%-50%, di/dt = 1A/μs See Table 1 for external components mV Settling Time to 1% of V 500 OUT μs Efficiency Vin = 24V 94.3 95.0 95.7 % 100% Load Vin = 12V 93.2 93.9 94.6 % Vin = 24V 95.3 96.0 96.7 % 50% Load Vin = 12V 94.9 95.6 96.3 % 1) Section “Input and Output Capacitance” www.murata-ps.com/support MDC_ICF_A08 Page 6 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Electrical Specifications - ICF0719V1xC Conditions: T = 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 24VDC, unless otherwise specified. Specifications are subject to change without notice. A Parameter Notes Min Typ Max Units Operating Input Voltage Range 9 24 36 V Input Under Voltage Lockout Non-latching Turn-on Threshold V 8.2 8.5 8.8 Turn-off Threshold 7.7 8.0 8.3 V Lockout Hysteresis Voltage 0.4 0.55 0.7 V Vin = 9V, 80% Load 89 Maximum Input Current A Vin = 12V, 100% Load 92 A Vin = 24V, Output Shorted 300 mARMS Input Stand-by Current Converter Disabled 2 4 mA Input Current @ No Load Converter Enabled 360 460 560 mA 1) Minimum Input Capacitance (external) ESR < 0.1 Ω 1000 μF 2 Inrush Transient 0.19 A s Input Reflected-Ripple Current, i 25 MHz bandwidth, 100% Load (Fig. 5) 0.8 A C RMS Output Characteristics 52.20 53.00 54.02 Nominal Output Voltage V Output Voltage Set Point Accuracy (No load) 52.78 53.00 53.22 V Output Regulation Over Line 0.05 0.10 Vin = 9V to 36V % Vin = 24V, Load 0% to 100% 0.05 0.10 Over Load % 0.005 0.015 Temperature Coefficient %/ºC 60.4 64.7 69.4 Overvoltage Protection V 70 140 mV PK-PK (Fig. 6) 100% Load, Output Ripple and Noise – 20 MHz bandwidth See Table 1 for external components 16 50 mV RMS 470 2200 μF 1) Full Load (resistive) C EXT External Load Capacitance (over operating temp range) ESR mΩ 10 100 Output Current Range (See Fig. A) Vin = 12V – 36V 0 19 A 0 15.2 A Vin = 9V Vin = 12V – 36V 20.9 22.8 24.7 Current Limit Inception A 9V ≤ Vin < 12V 16.7 18.2 24.7 A RMS Short-Circuit Current Non-latching 0.8 1.8 3.0 A RMS Dynamic Response Load Change 50%-75%-50%, di/dt = 1A/μs ±420 ±510 See Table 1 for external components mV ±850 ±1100 Load Change 50%-100%-50%, di/dt = 1A/μs See Table 1 for external components mV Settling Time to 1% of V 500 μs OUT Efficiency Vin = 24V 94.9 95.7 96.4 % 100% Load Vin = 12V 93.4 94.1 95.0 % Vin = 24V 95.3 96.2 96.9 % 50% Load Vin = 12V 95.1 95.4 96.5 % 1) Section “Input and Output Capacitance” www.murata-ps.com/support MDC_ICF_A08 Page 7 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Environmental and Mechanical Specifications NOTE: Specifications are subject to change without notice. Parameter Notes Min Typ Max Units Environmental Operating Humidity Non-condensing 95 % Storage Humidity Non-condensing 95 % See Murata Website http://www.murata-ps.com/en/support/rohs-compliance.html for the RoHS Compliance complete RoHS Compliance statement Shock and Vibration (See Note 1) Designed to meet MIL-STD-810G for functional shock and vibration. Water washability Not recommended for water wash process. Contact the factory for more information. Mechanical Ounces 8.55 Unit Weight Grams 242 0.079 0.081 0.083 Through Hole Pins Diameter Inches Pins 3, 3A, 4, 4A, 5, 6, 8 and 9 2.006 2.057 2.108 mm 0.038 0.04 0.042 Inches Pins 1, 2, 10, 11 and 12 0.965 1.016 1.667 mm Through Hole Pins Material Pins 3, 3A, 4, 4A, 5, 6 , 8 and 9 Copper Alloy Pins 1, 2, 10, 11 and 12 TB3 or “Eco Brass” Through Hole Pin Finish All pins 10μ” Gold over nickel 4.7 x 2.5 x 0.52 Inches Case Dimension 119.38 x 63.50 x 13.21 mm Plastic: Vectra LCP FIT30: ½-16 EDM Finish Case Material Plastic Aluminum Material Baseplate 0.010 Inches Flatness 0.25 mm Reliability Telcordia SR-332, Method I Case 1 50% electrical MTBF 5.4 MHrs stress, 40°C components EMI and Regulatory Compliance Conducted Emissions MIL-STD 461F CE102 with external EMI filter network (See Figures 57 and 58) 1. The unit must be properly secured to the interface medium (PCB/Chassis) by use of the threaded inserts of the unit. Output Power vs. Input Voltage 1200 1000 800 600 400 200 0 9 12 15 18 21 24 27 30 33 36 Input Voltage [V] Figure A: Output Power as function of input voltage. www.murata-ps.com/support MDC_ICF_A08 Page 8 of 25 Output Power [W] ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC TECHNICAL NOTES Input Source Impedance Because of the switching nature and negative input impedance of Input Fusing DC-DC converters, the input of these converters must be driven from the source with both low AC impedance and DC input The ICF converters do not provide internal fusing and therefore in regulation. some applications external input fuse may be required. Use of The ICF converters are designed to operate without external external fuse is also recommended if there is possibility for input components as long as the source voltage has very low voltage reversal. For greatest safety, it is recommended to use impedance and reasonable voltage regulation. However, since this fast blow fuse in the ungrounded input supply line. is not the case in most applications an additional input capacitor is required to provide proper operations of the ICF converter. Input Reverse Polarity Protection Specified values for input capacitor are recommendation and need to be adjusted for particular application. Due to large variation The ICF converters do not have input reverse polarity. If input between applications some experimentation may be needed. voltage polarity is reversed, internal diodes will become forward biased and draw excessive current from the power source. If the In many applications, the inductance associated with the power source is not current limited or input fuse not used, the distribution from the power source to the input of the converter converter could be permanently damaged. can affect the stability and in some cases, if excessive, even inhibit operation of the converter. This becomes of great Input Undervoltage Protection consideration for input voltage at 12V or below. The DC input regulation, associated with resistance between input Input undervoltage lockout is standard with this converter. The ICF power source and input of the converter, plays significant role in converter will start and regulate properly if the ramping-up input particular in low input voltage applications such as 12V battery voltage exceeds Turn-on threshold of typ. 8.5V (See Specification) systems. and remains at or above Turn-on Threshold. Note that input voltage at the input pins of the connector must The converter will turn off when the input voltage drops below the never degrade below Turn-off threshold under all load operating Turn-off Threshold of typical 8V (See specification) and converter conditions. enters hiccup mode and will stay off for 2 seconds. The converter Note that in applications with high pulsating loads additional input will restart after 2 seconds only if the input voltage is again above as well as output capacitors may be needed. In addition, for EMI the Turn-on Threshold. conducted measurement, due to low input voltage it is The built-on hysteresis and 2 second hiccup time prevents any recommended to use 5μH LISNs instead of typical 50μH LISNs. unstable on/off operation at the low input voltage near Turn-on Threshold. Input/Output Filtering User should take into account for IR and inductive voltage drop in Input Capacitor the input source and input power lines and make sure that the Minimum required input capacitance, mounted close to the input input voltage to the converter is always above the Turn-off pins of the converter, is 1000μF with ESR < 0.1Ω. Threshold voltage under ALL OPERATING CONDITIONS. Several criteria need to be met when choosing input capacitor: a) Start-Up Time type of capacitor, b) capacitance to provide additional energy storage, c) RMS current rating, d) ESR value that will ensure that The start-up time is specified under two different scenarios: a) output impedance of the input filter is lower than input impedance Startup by ON/OFF remote control (with the input voltage above of the converter and its variation over the temperature. the Turn-on Threshold voltage) and b) Start-up by applying the Since inductance of the input power cables could have significant input voltage (with the converter enabled via ON/OFF remote voltage drop due to rate of change of input current di(in)/dt during control). transient load operation, an external capacitor on the output of the The startup times are measured with maximum resistive load as: converter is required to reduce di(in)/dt. Another constraint is a) the interval between the point when the ramping input voltage minimum rms current rating of the input capacitors which is crosses the Turn-on Threshold and the output voltage reaches application dependent. One component of input rms current 90% of its nominal value and b) the interval between the point handled by input capacitor is high frequency component at when the converter is enabled by ON/OFF remote control and time switching frequency of the converter (typ. 400kHz) and is when the output voltage reaches 90% of its nominal value. specified under “Input terminal ripple current” i . Typical values at C When converter is started by applying the input voltage with full rated load and 24 Vin are provided in Section “Characteristic ON/OFF pin active there is delay of 500msec that was intentionally Waveforms” for each model and are in range of 2.5A (28Vout) – provided to prevent potential startup issues especially at low input 3.6A (24Vout). It is recommended to use ceramic capacitors for voltages attenuating this component for input terminal ripple current, which www.murata-ps.com/support MDC_ICF_A08 Page 9 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC is also required to meet requirement for conducted EMI (See EMI capable of sinking up to 0.36mA at a low level voltage of 0.8 V. Section). The second component of the input ripple current is due During logic high, the typical maximum voltage at ON/OFF pin to pulsating load current being reflected to the input and (generated by the converter) is 4.5V, and the maximum allowable electrolytic capacitors usually used for this purpose need to be leakage current is 160μA. If not using the remote on/off feature selected accordingly. Using several electrolytic capacitors in leave the ON/OFF pin open. parallel on the input is recommended. TTL Logic Level - The range between 0.81V and 2V is considered ESR of the electrolytic capacitors, need to be carefully chosen the dead-band. Operation in the dead-band is not recommended. taken into account temperature dependence. External voltage for ON/OFF control should not be applied when Output Capacitor there is no input power voltage applied to the converter. Similar considerations apply for selecting external output Output Overcurrent Protection (OCP) capacitor. For additional high frequency noise attenuation use of ceramic capacitors is recommended while in order to provide The converter is protected against overcurrent or short circuit stability of the converter during high pulsating load high value conditions. Upon sensing an overcurrent condition, the converter electrolytic capacitor is required. It is recommended to use several will switch to constant current operation and thereby begin to electrolytic capacitors in parallel in order to reduce effective ESR. reduce output voltage. When the output voltage drops below Note that external output capacitor also reduces slew rate of the approx. 50% of the nominal value of output voltage, the input current during pulsating load transients as discussed above. converter will shut down. We recommend 2 x 470uF (<40mΩ total ESR) or 3 x 330uF as Once the converter has shut down, it will attempt to restart minimum external output capacitance. nominally every 2 seconds. The attempted restart will continue indefinitely until the overload or short circuit conditions are ON/OFF (Pins 1 and 2) removed or the output voltage rises above 50% of its nominal value. The ON/OFF pin is used to turn the power converter on or off remotely via a system signal and has positive logic. A typical Once the output current is brought back into its specified range, connection for remote ON/OFF function is shown in Fig. 1. the converter automatically exits the hiccup mode and continues normal operation. During initial startup if output voltage does not exceed typical 50% of nominal output voltage within 500 msec after the converter is enabled, the converter will be shut down and will attempt to restart after 2 seconds. In case of startup into short circuit, internal logic detects short circuit condition and shuts down converter typical 5 msec after condition is detected. The converter will attempt to restart after 2 seconds until short circuit condition exists. Fig. 1: Circuit configuration for ON/OFF function. Output Overvoltage Protection (OVP) The positive logic version turns on when the ON/OFF pin is at logic The converter will shut down if the output voltage across +OUT high and turns off when at logic low. The converter is on when (Pins 5 and 6) and –OUT (Pins 8 and 9) exceeds the threshold of the ON/OFF pin is either left open or external voltage greater than the OVP circuitry. The OVP circuitry contains its own reference, 2V and not more than 12V is applied between ON/OFF pin and – independent of the output voltage regulation loop. Once the INPUT pin. See the Electrical Specifications for logic high/low converter has shut down, it will attempt to restart every 2 definitions. seconds until the OVP condition is removed. The negative logic version turns on when the ON/OFF pin is at Note that OVP threshold is set for nominal output voltage and not logic low and turns off when at logic high. The converter is on trimmed output voltage value or remote sense voltage. when the ON/OFF pin is either shorted to –INPUT pin or kept below 0.8V. The converter is off when the ON/OFF pin is either left Overtemperature Protection (OTP) open or external voltage not more than 12V is applied between ON/OFF pin and –INPUT pin. See the Electrical Specifications for The ICF converters have non-latching overtemperature protection. logic high/low definitions. It will shut down and disable the output if temperature at the center of the base plate exceeds a threshold of typical 108ºC for The ON/OFF pin is internally pulled up to typically 4.5V via resistor 9Vin, 112ºC for 12Vin and 115ºC for 24Vin/36Vin. Measured with and connected to internal logic circuit via RC circuit in order to ICF converter soldered to 5” x 3.5” x 0.07” 4 layers/ 2 Oz Cooper filter out noise that may occur on the ON/OFF pin. A properly de- FR4 PCB. The converter will automatically restart when the base bounced mechanical switch, open-collector transistor, or FET can temperature has decreased by approximately 20ºC. be used to drive the input of the ON/OFF pin. The device must be www.murata-ps.com/support MDC_ICF_A08 Page 10 of 25 ICF Series Wide Input 1000 Watt Isolated Full Brick DC-DC Safety Requirements V(SENSE+) - V(+OUT) ≤ 1V Basic Insulation is provided between input and the output. The V(-OUT) – V(SENSE-) ≤ 1V converters have no internal fuse. To comply with safety agencies Note that maximum output power is determined by maximum requirements, a fast-acting or time-delay fuse is to be provided in output current and highest output voltage at the output pins of the unearthed lead. Recommended fuse values are: the converter: a) 140A for 9V