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NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
SRBA-03E1AX
* * * * * Non-Isolated Fixed Frequency High Efficiency High Power Density
RoHS Compliant
* * * * *
Rev.A
OCP/SCP Remote On/Off Wide Trim Range Wide Input Range Active Low/Active High (Option)
Under-voltage Lockout (UVLO)
Description
The Bel SRBA-03E1AX modules are a series of non-isolated dc/dc converters that deliver up to 3 A of output current with full load efficiency of 93% at 5.0 Vdc output. These modules provide precisely regulated voltage programmable via external resistor from 0.75 Vdc to 5.0 Vdc over a wide range of input voltage. Their openframe construction and small footprint enable designers to develop cost and space-efficient solutions. Standard features include remote On/Off, programmable output voltage and over current protection.
Part Selection
Output Voltage 0.75 V - 5.0 V1 Input Voltage 4.5 V - 14 V Max. Output Current 3A Max. Output Power 15 W Typical Efficiency at 5.0V 93% Model Number Active High SRBA-03A1A0 Model Number Active Low SRBA-03A1AL
Notes: 1. These modules use a buck topology, so the output voltages must be 0.5 V less than the input voltage. 2. Add "G" to the end of the Model Number to indicate Tray Packaging. 3. 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) Output Enable Terminal Voltage Ambient Temperature Storage Temperature Min -0.3 V -0.3 V -40 C -55 C Typ Max 15 V 15 V 85 C 125 C Notes
Note: All specifications are typical at 25 C unless otherwise stated.
Input Specifications
Parameter Input Voltage Vo set=5 V Vo set3.3 V Input Current (full load) Vo=5.0 V Vo=3.3 V Vo=0.75 V Input Current (no load) Vo=5.0 V Vo=3.3 V Vo=0.75 V Remote Off Input Current 65 mA 50 mA 15 mA 3 mA 80 mA 60 mA 20 mA 6 mA 1.35 A 1.00 A 0.25 A 3.70 A 2.50 A 0.65 A 7.0 V 4.5 V 12 V 12 V 14 V 14 V Min Typ Max Notes
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
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Min 3.8 V 3.8 V Typ 150 mA 100 mA 35 mA 30 mA 20 mA 8 mA 2 0.01 A s 5.5 V 4.3 V 5.5 V 4.0 V Max 200 mA 150 mA 45 mA 40 mA 35 mA 15 mA 2 0.02 A s 6.5 V 4.5 V 6.0 V 4.3 V Notes Tested with simulated source impedance of 1uH, 5 Hz to 20 MHz and two 100 uF/25 V external input Tantalum capacitors.
Input Specifications (continued)
Parameter Input Reflected Ripple Current (pk-pk) Vo=5.0 V Vo=3.3 V Vo=0.75 V Input Reflected Ripple Current (rms) Vo=5.0 V Vo=3.3 V Vo=0.75 V 2 I t Inrush Current Transient Turn-on Voltage Threshold Vo set=5 V Vo set3.3 V Turn-off Voltage Threshold Vo set=5 V Vo set3.3 V
Output Specifications
Parameter Output Voltage Set Point Output Voltage Set Point Load Regulation Line Regulation Regulation Over Temperature (-40 C to +85 C) Output Current Current Limit Threshold Short Circuit Surge Transient Ripple and Noise (pk-pk) Vo=5.0 V Vo=3.3 V Vo=0.75 V Ripple and Noise (rms) Vo=5.0 V Vo=3.3 V Vo=0.75 V Ripple and Noise (pk-pk) Vo=5.0 V Vo=3.3 V Vo=0.75 V Ripple and Noise (rms) Vo=5.0 V Vo=3.3 V Vo=0.75 V Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load Settling Time All 100% ~ 50% Max Load Settling Time Min -2%Vo,set -3.5%Vo,set 0.4%Vo,set 0.4%Vo,set 0A 5A 0 uF Typ 0.2%Vo,set 0.3%Vo,set 0.5%Vo,set 2 0.1A s 100 mV 80 mV 55 mV 30 mV 20 mV 15 mV 60 mV 40 mV 20 mV 15 mV 12 mV 5 mV 8 mS 0% 150 mV 25 uS 150 mV 25 uS Max 2%Vo,set 2.5%Vo,set 0.4%Vo,set 0.4%Vo,set 3A 9.5 A 2 0.2 A s 120 mV 100 mV 80 mV 40 mV 30 mV 20 mV 80 mV 50 mV 30 mV 25 mV 20 mV 10 mV 12 mS 3% 1200 uF 200 mV 40 uS 200 mV 40 uS Test conditions: 0-20 MHz BW, with external 10 uF/10 V Tantalum capacitor and 1uF/10V ceramic capacitor at the output. Notes Vin=12 V, lo=lomax Over all operating input voltage, resistive load, and temperature conditions lo=lomin to lomax Vin=Vinmin to Vinmax
Test conditions: 0-20 MHz BW, with external 10 uF/10 V Tantalum capacitor 1uF/10V ceramic capacitor and two 22 uF/10 V ceramic capacitors at the output.
Test conditions: di/dt = 2.5 A/uS, Vin=12 V, and with external 10 uF/10 V Tantalum capacitor and 1uF/10 V ceramic capacitor at the output.
Note: All specifications are typical at nominal input (Vin=12 V), full load 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 CONVERTERS
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
General Specifications
Parameter Efficiency Vo=5.0 V Vo=3.3 V Vo=0.75 V Switching Frequency Output Voltage Trim Range (Wide Trim) MTBF Dimensions (Surface Mount) Inches (L x W x H) Millimeters (L x W x H) Weight 90% 88% 77% 200 kHz 0.7525 V 93% 91% 80% 230 kHz 6,350,000 hours 0.8 x 0.45 x 0.251 20.32 x 11.42 x 6.38 2.5 g 250 kHz 5V Calculated Per Bell Core SR-332 (IO = 80% load; Ta = 25 C) Measured at Vin=12 V, full load Min Typ Max Notes
-
-
Note: All specifications are typical at 25 C unless otherwise stated.
Control Specifications
Parameter Remote On/Off Signal Low (Unit Off) Signal High (Unit On) Signal Low (Unit On) Signal High (Unit Off) Min -0.3 V 2.5 V -0.3 V 2.5 V Typ Max 0.4 V 14 V 0.4 V 14 V Remote On/Off pin open, Unit on. Notes
Output Trim Equations
Equation for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) is shown below. The Trim Up resistor should be connected between the Trim pin and Ground.
Vout
Rtrim =
10.507 -1 Vadj - 0.7525
Module Trim
GND
Rtrim
Equation for calculating the trim voltage (in V) given the desired adjusted voltage (Vadj) is shown below. The Trim Up voltage should be connected between the Trim pin and Ground.
Vout
Vtrim = 0.7 - 0.0667 x (Vadj - 0.7525)
Module
Trim
Vtrim
GND
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
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Efficiency Data
MODULE 5.0V 100.0% EFFICIENCY 90.0% 80.0% 70.0% 60.0% 0.30A 0.75A 1.50A 2.25A OUTPUT CURRENT 7.0V 12.0V 14.0V 3.00A
MODULE 3.3V 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.30A
EFFICIENCY
4.5V 12.0V 14.0V 0.75A 1.50A 2.25A 3.00A OUTPUT CURRENT
MODULE 0.75V 90.0% EFFICIENCY 80.0% 70.0% 60.0% 50.0% 0.30A 4.5V 12.0V 14.0V 1.75A 1.50A 2.25A 3.00A
OUTPUT CURRENT
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
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Thermal Derating Curves
Vin=12 V, Vo=5.0 V
Vin=12 V, Vo=3.3 V
Vin=12 V, Vo=0.75 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 CONVERTERS
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Ripple and Noise Waveforms
12 Vdc input, 0.75 Vdc output
12 Vdc input, 3.3 Vdc output
12 Vdc input, 5.0 Vdc output Note: Ripple and noise at full load, 0-20 MHz BW, with 10 uF/10 V tantalum cap and 1 uF/10 V ceramic cap at the output, and 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
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Transient Response Waveforms
Transients 50% to 100% load 0.75 Vdc output
Transients 100% to 50% load 0.75 Vdc output
Transients 50% to 100% load 3.3 Vdc output
Transients 100% to 50% load 3.3 Vdc output
Transients 50% to 100% load 5.0 Vdc output
Transients 100% to 50% load 5.0 Vdc output
Note: Transient response at 12 Vdc input, di/dt=2.5 A/uS, with 10 uF/10 V tantalum cap and 1 uF/10 V ceramic cap at the output, 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
NON-ISOLATED DC/DC CONVERTERS
4.5 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Mechanical Outline
Pin Connections
Pin 1 2 3 4 Function Remote On/Off Vin N/A Ground Trim Vout
RECOMMENDED PAD LAYOUT
5 6
PAD SIZE: MIN: 0.12" *0.095" (3.05mm*2.41mm) MAX: 0.135"*0.11" (3.43mm*2.79mm)
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products.
(c)2007 Bel Fuse Inc. Specifications subject to change without notice. 011207
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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