CMFA Series Rev E Full Brick 250-300 Watt, Single Output Chassis Mount DC/DC Converter FEATURES ● 100% Burn In ● Chassis Mount ● Synchronizable ● Output Trim ±10% ● 1500VDC Isolation ● Operation to No Load ● Very Low Output Ripple ● Output Current up to 60A ● Fast Transient Response ● Fixed Switching Frequency ● 250-300 Watts Output Power ● Remote Sense Compensation ● Remote ON/OFF (Active High/Low) ● Short Circuit and Over Temperature Protection ● 90% Efficient at Half Load, 88% Efficient at Full Load DESCRIPTION The CMFA series consists of high-density full brick converters that incorporate the desired features required in today’s demanding low voltage bus applications. Its unique dual interleaved phase-shifted topology minimizes both input and output noise. When performance, reliability, and low cost are needed, the CMFA series delivers. SPECIFICATIONS: CMFA Series All specifications apply @ 25°C ambient unless othe rwise noted INPUT SPECIFICATIONS PROTECTION SPECIFICATIONS Input Voltage Range................................................................. 10-36VDC Current Limit ......................................................................................130% UVLO Turn On at ................................................................... 10VDC max Short Circuit Protection ......................................Continuous, self re-setting UVLO Turn off at ................................................................... 9.5VDC max Over Temperature Protection .....................................110°C, self re-setting Input Surge Voltage (100ms)......................................................... 50VDC GENERAL SPECIFICATIONS Reflected Ripple Current (nominal Vin and full load).........................20mA Remote ON/OFF ................................................See Technical Datasheet Input Current under Remote Off .........................................................1mA Maximum Input Current (Low Line)......................................................35A No Load Input Current........................................................................0.1A OUTPUT SPECIFICATIONS Efficiency ..................................................................................90% typical Switching Frequency............................................................... 700KHz typ. Isolation Voltage (Input to Output)........................................1500VDC min. Isolation Resistance .....................................................................1GΩ min. Isolation Capacitance...................................................................... 0.01µF ENVIRONMENTAL SPECIFICATIONS Output Voltage ............................................................................see table Voltage Accuracy ...............................................................................±1% Output Adjustability ..........................................................................±10% Output Current ............................................................................see table Output Power ..............................................................................see table Operating Temperature (ambient) .......................... -40°C ~ +100°C (case) Storage Temperature .........................................................-55°C ~ +125°C Humidity.................................................................fully potted construction Cooling ........................................................ heatsink optional (see Note 4) MTBF................................................................................ 2,212,456 hours Line Regulation (LL to HL at FL)......................................................±0.2% Load Regulation (20% to 100% load) ..............................................±0.2% PHYSICAL SPECIFICATIONS Ripple/Noise (20 MHz BW)................................................... 1% Vout max Weight ............................................................................................... 11 oz Temperature Coefficient.................................................±0.02% / °C max. Dimensions of Fixture .......................... 8.00(L) x 3.40(W) x 0.91(H) inches Transient Response (50% load step)............................. 5% total deviation Dimensions of DC/DC Converter..........................4.6(L) x 2.4(W) x 0.50(H) Shielding of DC/DC Converter.......................................................six-sided Due to advances in technology, specifications subject to change without notice 09/13/2013 Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833 603-778-2300 www.wallindustries.com Fax 603-778-9797 Page 1 of 3 CMFA Series Full Brick 250-300 Watt, Single Output Chassis Mount DC/DC Converter Rev E MODEL SELECTION TABLE Model Number for Threaded Inserts Model Number for Thru-Hole Inserts CMFA12S5-300 Input Voltage Range Output Voltage Output Current Output Power CMFA12S5-300TH 5 VDC 60A 300W CMFA12S12-300 CMFA12S12-300TH 12 VDC 25A 300W CMFA12S15-300 CMFA12S15-300TH 15 VDC 20A 300W CMFA12S20-300 CMFA12S20-300TH 20 VDC 15A 300W CMFA12S24-300 CMFA12S24-300TH 24 VDC 12.5A 300W 12/24 VDC (10 – 36 VDC) CMFA12S26-300 CMFA12S26-300TH 26 VDC 11.538A 300W CMFA12S28-300 CMFA12S28-300TH 28 VDC 10.714A 300W CMFA12S43-250 CMFA12S43-250TH 43 VDC 5.814A 250W CMFA12S48-250 CMFA12S48-250TH 48 VDC 5.208A 250W NOTES 1. Pin to pin tolerance ± 0.01" [±0.3mm]. Pin diameter tolerance ±0.005" [±0.13mm]. 2. Case material of the DC/DC converter: 0.040" [1.02mm] thick, aluminum alloy 3003-0, Per: QQA 250/2. 3. Unit comes with either 3M x 0.5 threaded thru inserts for the chassis mount board or for Ø.125 thru-hole for the chassis mount board add the suffix "TH" to the model part number. Ex: CMFA12S24-300TH. 4. For Heat sink add “HS” suffix to the model part number. Ex: CMFA12S24-300HS. 5. Active High Enable is standard; for Active Low Enable add “R” suffix to the model number. Ex: CMFA12S24-300R. DERATING CURVE CMFA12S24-300 MAX AMBIENT vs OUTPUT POWER 09/13/2013 Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833 603-778-2300 www.wallindustries.com Fax 603-778-9797 Page 2 of 3 CMFA Series Full Brick 250-300 Watt, Single Output Chassis Mount DC/DC Converter Rev E MECHANICAL DRAWING Unit: inches [mm] 8.00 [203.2] 7.000 [177.80] .50 [12.7] 3.500 [88.90] +INPUT +OUTPUT +S SD 3.40 [86.4] 2.875 [73.03] TRIM SYNC -S -INPUT -OUTPUT .26 [6.7] .000 [0.00] DATE CODE LABEL SERIAL NO: UNIT THRU HOLE Ø.125 [3.2] 6X REF PCB THRU HOLE Ø.140 [3.6] 6X REF Ø.143 [3.6] MOUNTING HOLES 6X GROUNDED 6-PLACES TERMINAL SCREW .136 (NO:6)-32UNC 9X .91 [23.0] .24 [6.0] REF Ø.28 [7.1] 6X .000 [0.00] .13 [3.2] 6X REF .000 [0.00] TO ORDER 1. Unit comes with either 6-32x.281 threaded thru inserts for the chassis mount board or for ø.125 thru-hole for the chassis mount board add the suffix "TH" to the model part number. Ex: CMFA12S24-300TH. 2. For Heat Sink Add “HS” suffix to model part number. Ex: CMFA12S24-300HS 09/13/2013 Wall Industries, Inc. 5 Watson Brook Road Exeter, NH 03833 603-778-2300 www.wallindustries.com Fax 603-778-9797 Page 3 of 3