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NON-ISOLATED DC/DC CONVERTERS
8.3 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
VRBA-03A1Ax
* * * * * Non-Isolated Fixed Frequency High Efficiency High Power Density
RoHS Compliant
* * * * *
Rev.A
Under-Voltage Lockout (UVLO) OCP/SCP Remote On/Off Wide Trim Range Wide Input Range
Active Low/High (Option)
Description
The Bel VRBA-03A1Ax 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 5.5 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, over-temperature protection, over current protection, short circuit protection, and under-voltage lockout.
Part Selection
Output Voltage 0.75 V - 5.0 V Input Voltage 8.3 V - 14 V Max. Output Current 3A Max. Output Power 15 W Typical Efficiency at 5.0V 93% Model Number Active High VRBA-03A1A0 Model Number Active Low VRBA-03A1AL
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) 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 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 55 mA 40 mA 15 mA 65 mA 50 mA 20 mA Min 8.3 V Typ 12 V 1.35 A 0.90 A 0.24 A Max 14 V 2.00 A 1.37 A 0.37 A 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
8.3 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Input Specifications (continued)
Parameter Remote Off Input Current 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 Turn-off Voltage Threshold Min 7.6 V 7.0 V Typ 3 mA 70 mA 60 mA 25 mA 20 mA 15 mA 6 mA 2 0.01 A s 7.9 V 7.8 V Max 6 mA 100 mA 90 mA 40 mA 60 mA 30 mA 15 mA 2 0.02 A s 8.2 V 8.1 V Notes
Tested with two 100 uF/25 V tantalum input capacitors & simulated source impedance of 1uH, 5 Hz to 20 MHz.
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 Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time All 200 mV 50 uS 200 mV 50 uS 300 mV 80 uS 300 mV 80 uS di/dt=2.5 A/uS; Vin=12 V; and with 10 uF/10 V tantalum capacitor and 1uF/10 V ceramic capacitor at the output 0 uF 25 mV 15 mV 5 mV 5 mS 0% 45 mV 25 mV 10 mV 8 mS 3% 1200 uF 80 mV 55 mV 25 mV 120 mV 80 mV 45 mV Tested with 0-20 MHz, with 10 uF/10 V tantalum capacitor and 1uF/10 V ceramic capacitor at the output Min -2%Vo,set -2.5%Vo,set 0.5%Vo,set 0.4%Vo,set 0A 4.2 A Typ 0.4%Vo,set 0.3%Vo,set 0.5%Vo,set 0.1 A s
2
Max 2%Vo,set 3.5%Vo,set 0.5%Vo,set 0.4%Vo,set 0.8%Vo,set 3A 11 A -
Notes Vin=12 V, lo=lomax, full load Over all operating input voltages, resistive loads and temperature conditions Io=Iomin to Iomax Vin=Vinmin to Vinmax
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
8.3 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 Over Temperature Shutdown MTBF Dimensions (Vertical Mount) Inches (L x W x H) Millimeters (L x W x H) Weight 89% 86% 73% 93% 90% 77% 300 kHz 135 C 8,791,825 hours 0.9 x 0.4 x 0.243 22.9 x 10.2 x 6.16 2.5 g Calculated Per Bell Core SR-332 (IO = 80% load; Ta = 25 C) Measured at Vin=12 V, full load (Current Source) 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) Output Voltage Trim Range (Wide Trim) Min -0.3 V 2.5 V -0.3 V 2.5 V 0.7525 V Typ Max 0.4 V 14 V 0.4 V 14 V 5.0 V Notes VRBA-03A1A0; Remote On/Off pin open, Unit on. VRBA-03A1AL; Remote On/Off pin open, Unit on.
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
8.3 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Efficiency Data
MODULE 5.0V 100.0% 95.0% 90.0% 85.0% 80.0% 75.0% 70.0% 65.0% 60.0% 0.30A 0.75A 1.50A 2.25A OUTPUT CURRENT
EFFICIENCY
8.3V 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
8.3V 12.0V 14.0V 0.75A 1.50A 2.25A OUTPUT CURRENT 3.00A
MODULE 0.75V 85.0% EFFICIENCY 75.0% 65.0% 55.0% 45.0% 0.30A 1.75A 1.50A 2.25A OUTPUT CURRENT 8.3V 12.0V 14.0V 3.00A
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
8.3 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
8.3 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
8.3 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
8.3 Vdc - 14 Vdc Input 0.75 Vdc - 5.0 Vdc/3 A Output
Mechanical Outline
Pin Connections
Pin 1 2 3 4 5 Function Vout Trim Ground Vin Remote On/Off
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. 011507
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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