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ISOLATED DC/DC CONVERTERS
48 VDC Input 12 VDC/8.5 A Output, 1/16 Brick
SRCA-08S12L
* * * * * Isolated Fixed Frequency High Efficiency High Power Density Low Cost
RoHS Compliant
* * * * *
Rev.B
Input Under Voltage Lockout Input Over Voltage Shutdown OCP/SCP Over Temperature Protection Remote On/Off
Description
The SRCA-08S12L is an isolated DC/DC converter that operates from a nominal 48 VDC source. These converters use a half bridge power train to provide isolation and step down. These units will provide up to 100 W of output power from a nominal 48 VDC input. These units are designed to be highly efficient and low cost. Features include remote on/off, over current protection and under voltage lockout. These converters are provided in an industry standard sixteenth-brick package.
Part Selection
Output Voltage 12 V Input Voltage 36 V - 55 V Max. Output Current 8.5 A Max. Output Power 100 W Typical Efficiency 95% Model Number Active Low SRCA-08S12L
Notes: 1. Add "G" suffix at the end of the model number to indicate Tray Packaging. 2. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers.
Absolute Maximum Ratings
Parameter Input Voltage (continuous) Remote On/Off I/O Isolation Voltage Ambient Temperature Storage Temperature Min -0.3 V -0.3 V -40 C -40 C Typ 500 V Max 80 V 18 V 85 C 125 C Notes
Input Specifications
Parameter Input Voltage Input Current (full load) Input Current (no load) Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (rms) I t Inrush Current Transient Input Over Voltage Protection Threshold Turn On Voltage Threshold Turn Off Voltage Threshold
2
Min 36 V -
Typ 4 mA 40 mA 10 mA 0.039 A s 59 V 35 V 30 V
2
Max 55 V 2.5 A 120 mA 10 mA 100 mA 30 mA 0.062 A s 2
Notes
Active Low Tested with simulated source impedance of 10 uH, 5 Hz to 20 MHz; use a 100 uF/100 V electrolytic capacitor and 1 uF/100 V ceramic capacitor at the input.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 VDC Input 12 VDC/8.5 A Output, 1/16 Brick
Output Specifications
Parameter Output Voltage Set Point Vin=36 V Vin=48 V Vin=55 V Line Regulation Load Regulation Vin=36 V Vin=48 V Vin=55 V Regulation Over Temperature (-40 C to +85 C) Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (rms) Ripple and Noise (pk-pk) Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 75% Max Load 75% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time Vin=48V 150 mV 30 uS 150 mV 30 uS 350 mV 100 uS 350 mV 100 uS Test conditions: di/dt = 0.5 A/uS, Vin=48 V 0A 9A 0 uF 0.6 V 0.6 V 0.6 V 100 mV 1.3 A s 30 mV 90 mV 10 mS 0% 2
Min 8.8 V 11.8 V 13.5 V -
Typ 9V 12 V 13.75 V 4.75 V
Max 9.2 V 12.2 V 13.95 V 5.0 V 0.8 V 0.8 V 0.8 V 200 mV 8.5 A 14 A 2.1 A s 60 mV 150 mV 20 mS 3% 2000 uF
2
Notes lout=no load
Test conditions: 0-20 MHz BW, with a 1 uF ceramic capacitor and a 10 uF Tantalum capacitor at the output; Vin=48 V.
Note: All specifications are typical at 25 C unless otherwise stated.
General Specifications
Parameter Efficiency Switching Frequency Isolation Capacitance Over Temperature Protection MTBF Dimensions Inches (L x W x H) Millimeters (L x W x H) Weight 1.3 x 0.9 x 0.4 33.0 x 22.9 x 10.2 14.5 g Min 93% 160 kHz Typ 95% 190 kHz 1500 pF 115 C 3,008,073 hours Max 220 kHz Average PCB temperature will not exceed 115 C. Calculated Per Bell Core SR-332 (IO=80% full load; Vo=12 V; Ta = 25 C) Notes Vin=48V, Io=Io,max
-
Note: All specifications are typical at 25 C unless otherwise stated.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 VDC Input 12 VDC/8.5 A Output, 1/16 Brick
Control Specifications
Parameter Remote On/Off Signal Low (Unit On) Signal High (Unit Off) Active Low -0.3 V 2.4 V 0.8 V 18 V SRCA-08S12L. The remote on/off pin open, Unit off. Min Typ Max Notes
Efficiency Data
100.00% 95.00% EFFICIENCY 90.00% 85.00% 80.00% 75.00% 0.00 2.00 4.00 6.00 8.00 OUTPUT CURRENT (A) 36 V 48 V 55 V
Thermal Derating Curve
Note: Derating curve is tested at nominal input voltage.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 VDC Input 12 VDC/8.5 A Output, 1/16 Brick
Ripple and Noise Waveform
Note: Ripple and noise at full load, 48 V input and Ta=25 deg C, and with a 10 uF tantalum capacitor and 1 uF ceramic capacitor on output.
Transient Response Waveforms
50% to 75% Transient at 48 V input
75% to 50% load Transient at 48 V input
Note: Transient response at di/dt=0.5 A/uS, Ta=25 deg C.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 12 Vdc/8.5 A Output, 1/16 Brick
Mechanical Outline
Pin Connections
Pin 1 2 3 4 5 Function Vin+ Remote On/Off VinVoutVout+
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products.
(c)2008 Bel Fuse Inc. Specifications subject to change without notice. 121808
CORPORATE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com
FAR EAST Bel Fuse Ltd. 8F/ 8 Luk Hop Street San Po Kong Kowloon, Hong Kong Tel 852-2328-5515 Fax 852-2352-3706 www.belfuse.com
EUROPE Bel Fuse Europe Ltd. Preston Technology Management Centre Marsh Lane, Suite G7, Preston Lancashire, PR1 8UD, U.K. Tel 44-1772-556601 Fax 44-1772-888366 www.belfuse.com

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