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NON-ISOLATED DC/DC CONVERTER
9.0 V - 32 V Input 10 V - 12 V/3.5 A Output
SRDB-04HX20
* * * * Non-Isolated Fixed Frequency (340 kHz) Over Current Protection SCP
RoHS Compliant
* * * Remote Sense Low Profile Package (8.5mm) Remote On/Off (Active Low)
Description
The SRDB-04HX20 is part of the low cost non-isolated dc/dc converter. The module uses a DIP package for ease of layout and space savings, with a low profile of 8.5 mm. The output is closely regulated and the efficiency of 12 V is typically 86% at full load. Features include remote sense, over current protection and remote on/off.
Part Selection
Output Voltage 10 V - 12 V Input Voltage 9.0 V - 32 V Max. Output Current 3.5 A Max. Output Power 42 W Typical Efficiency 86% Model Number SRDB-04HX20
Note: Add "R" suffix at the end of the model number to indicate "Reel Packaging", and "G" for "Tray Packaging".
Absolute Maximum Ratings
Parameter Input Voltage (continuous) Output Enable Voltage Ambient Temperature Storage Temperature Min -0.3 V -0.3 V -40 C -55 C Typ Max 36 V 12 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 Turn-on Voltage Threshold
2
Min 9V -
Typ 20 V 50 mA 1 mA 500 mA 170 mA 0.05 A s 8.5 V
2
Max 32 V 5.6 A 100 mA 3 mA 750 mA 250 mA 0.1 A s 9.0 V
2
Notes
Tested with simulated source impedance of 500 nH, 5 Hz to 20 MHz; and two 100 uF/50 V electrolytic capacitors and a 3.3 uF/50 V ceramic capacitor at the input.
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
NON-ISOLATED DC/DC CONVERTER
9.0 V - 32 V Input 10 V - 12 V/3.5 A Output
Output Specifications
Parameter Output Voltage Set Point Line Regulation Load Regulation Regulation Over Temperature (-40 C to 85 C) Ripple and Noise (rms) Ripple and Noise (pk-pk) Output Current Output Current Limit Threshold Short Circuit Surge Transient Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load 100% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time 220 mV 300 uS 130 mV 300 uS 250 mV 500 uS 250 mV 500 uS Tested at di/dt=0.5 A/us, Vin=20 V, with 33uF-0.5 uH-33 uF second stage filter. Min 11.89 V 0A 4A 0 uF Typ 12.13 V 12 mV 12 mV 30 mV 2.5 mV 10 mV 0.2 A s 3.5 mS 2%
2
Max 12.37 V 24 mV 24 mV 50 mV 5 mV 20 mV 3.5 A 7A 0.5 A s 10 mS 5% 220 uF
2
Notes Vin=20 V, lout=50% full load
Test conditions: 0-20 MHz BW; with 33 uF-0.5 uH-33 uF second stage filter.
Note: All specifications are typical at 20 V input, full load at 25 C unless otherwise stated.
General Specifications
Parameter Efficiency Switching Frequency Output Voltage Trim Range Remote Sense Compensation MTBF Dimensions Inches millimeters Weight 1.22 x 0.827 x 0.345 30.99 x 21.00 x 8.76 11 g Min 83% 310 kHz 80%Vo Typ 86% 340 kHz 5,373,282 hours Max 370 kHz 105%Vo 5% Calculated Per Bell Core SR-332 (IO = 2 A, Vo=12 V, Vin=20 V; Ta = 25 C) Notes Vin=20 V, full load
-
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
Control Specifications
Parameter Min -0.3 V 2.8 V Typ Max 1V 12 V Notes
Remote On/Off
Signal Low (Unit On) Signal High (Unit Off)
Remote on/off pin open, unit on.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTER
9.0 V - 32 V Input 10 V - 12 V/3.5 A Output
Output Trim Equations
Equations for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) and the nominal output voltage of the converter (Vnom) are shown below. The Trim Down resistor should be connected between the Trim pin and Vout. The Trim Up resistor should be connected between the Trim pin and Ground. Only one of the resistors should be used for any given application.
Rtrimdown =
83.408 - 8.66 Vnom - Vadj
Vout Rtrimdown Module Trim GND
Rtrimup
21.65 = Vadj - Vnom
Vout Module Trim Rtrimup GND
Note: The output voltage Vnom = 12.13V.
Efficiency Data
Efficiency Curve 90.0% 88.0% 86.0% 84.0% 82.0% 80.0% 78.0% 76.0% 74.0% 72.0% 70.0% 0.5 1.0 1.5 2.0 2.5 3.0 3.5 Output Current (A)
Efficiency
9.0 V 20.0 V 32.0 V
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
NON-ISOLATED DC/DC CONVERTER
9.0 V - 32 V Input 10 V - 12 V/3.5 A Output
Thermal Derating Curve
Note: Derating curve is for 12 V output and 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
NON-ISOLATED DC/DC CONVERTERS
9.0 V - 32 V Input 10 V - 12 V/3.5 A Output
Mechanical Outline
Pin Connections
Pin 1 2 3 4 5 6 7 8 9 10 11 12 Function Trim Remote On/Off Remote Sense Vo Vo Vo Ground Ground Ground N/A (Leave this pin unconnected) Vin Vin
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products. These parts are not however compatible with the higher temperatures associated with lead free solder processes and must be soldered using a reflow profile with a peak temperature of no more than 240 C.
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 112205
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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