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NON-ISOLATED DC/DC CONVERTERS
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
VRPF-15B1AC
* * * * *
RoHS Compliant
* * * *
Rev.A
Non-Isolated Fixed Frequency (300 kHz) Remote On/Off Low Cost Power Good Output Signal (open collector)
Wide Trim Range Under-voltage Lockout (UVLO) OCP/SCP Converter Can Sink and Source Current
Description
The Bel VRPF-15B1AC is part of the low cost non-isolated dc/dc converter series. The modules use a SIP package for ease of layout and space savings. The output is closely regulated and can be trimmed from 1.2 Vdc to 3.3 Vdc. The efficiency is typically 93% at 3.3 Vdc output at full load. Typical features include remote on/off, under-voltage lockout, over-current protection and short circuit protection.
Part Selection
Output Voltage 1.2 Vdc - 3.3 Vdc Input Voltage 5 Vdc Max. Output Current 15 A Max. Output Power 49.5 W Typical Efficiency 93% Model Number VRPF-15B1AC
Notes: 1. All part numbers above indicate RoHS 6. Change the second letter "R" to "7" for RoHS 5 part numbers. 2. Add "0" suffix at the end of the model number to indicate "Tube Packaging", and "G" for "Tray Packaging".
Absolute Maximum Ratings
Parameter Input Voltage (continuous) Output Enable Terminal Voltage Ambient Temperature Storage Temperature Min -0.3 V -0.3 V 0 C -40 C Typ Max 7V 7V 80 C 125 C Notes
Input Specifications
Parameter Input Voltage Input Current (Source) Vo=3.3 V Vo=1.8 V Vo=1.2 V Input Current (Sink) Vo=3.3 V Vo=1.8 V Vo=1.2 V No Load Input Current Remote Off Input Current Input Reflected Ripple Current (pk-pk) Input Reflected Ripple Current (rms) I t Inrush Current Transient Turn-on Voltage Threshold Turn-off Voltage Threshold
2
Min 4.5 V -
Typ 5V 11.7 A 6.8 A 4.8 A -10 A -5 A -3 A 35 mA 10 mA 90 mA 20 mA 0.02 A s 4.25 V 4V
2
Max 5.5 V 12.5 A 7.4 A 5.2 A -7.8 A -3.8 A -2.3 A 22 mA 150 mA 40 mA 0.05 A s 2
Notes
Tested with simulated source impedance of 500 nH, 5 Hz to 20 mHz and five 10 uF/10 V capacitors (P/N: C3216X5R1A106K, TDK) 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 CONVERTERS
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
Output Specifications
Parameter Output Voltage Set Point VO=3.3 V VO=1.8 V VO=1.2 V Load Regulation VO=3.3 V VO=1.8 V VO=1.2 V Line Regulation VO=3.3 V VO=1.8 V VO=1.2 V Regulation Over Temperature (0C to +80 C) VO=3.3 V VO=1.8 V VO=1.2 V Output Ripple and Noise (pk-pk) Output Ripple and Noise (rms) Output Current Current Limit Threshold Short Circuit Surge Transient Turn on Time Overshoot at Turn on Output Capacitance VO=3.3 V VO=1.8 V VO=1.2 V Transient Response 50% ~ 100% Max Load Settling Time 100% ~ 50% Max Load Settling Time VO=1.2 V3.3 V 35 mV 50 uS 35 mV 50 uS 50 mV 100 uS 50 mV 100 uS Test conditions: di/dt = 0.1 A/uS; Vin = 5 V; with 1000 uF electrolytic capacitor and five 10 uF/10 V TDK C3216X5R1A106K ceramic capacitors at the output 13200 uF 16400 uF 17600 uF 2 mV 1 mV 1 mV 5 mV 3 mV 2 mV 5 mV 3 mV 2 mV 8 mV 5 mV 4 mV Line/Load regulation is the deviation from nominal to minimum and maximum line/load. Min 3.234 V 1.764 V 1.176 V Typ 3.3 V 1.8 V 1.2 V Max 3.366 V 1.836 V 1.224 V Notes Test condition: Vin=5 V, lout=50% full load
-15 A 19 A -
13 mV 9 mV 8 mV 30 mV 5 mV 0.5 A s 10 mS 0%
2
28 mV 18 mV 15 mV 50 mV 15 mV 15 A 35 A 1A s 20 mS 3%
2
Tested at 0-20 MHz BW with 1000 uF electrolytic capacitor & five 10 uF/10 V TDK C3216X5R1A106K capacitors and 0.1 uF ceramic capacitor at the output
Note: All specifications are typical at nominal input, 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
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
General Specifications
Parameter Efficiency (Current Source) VO=3.3 V VO=1.8 V VO=1.2 V Efficiency (Current Sink) VO=3.3 V VO=1.8 V VO=1.2 V Switching Frequency Output Voltage Trim Range MTBF Dimensions Inches (L x W x H) Millimeters (L x W x H) Weight 1.2 x 1.0 x 0.457 30.48 x 25.4 x 11.6 13 g Min 89% 83% 80% 86% 79% 72% 275 kHz 1.2 V Typ 93% 87% 82% 90% 83% 75% 300 kHz 4,573,743 hours Max 325 kHz 3.3 V Calculated Per Bell Core SR-332 (Vin=5.0 V, IO=12 A; Ta = 25 C) Notes
Measured at Vin=5 V, full load.
Note: All specifications are typical at 25 C unless otherwise stated.
Control Specifications
Parameter Min -0.3 V 2.4 V Typ 0.3 V 5 mA Max 0.8 V 7V 10 mS Notes
Remote On/Off
Signal Low (Unit Off) Signal High (Unit On) 1 Power Good Delay 2 Signal Low Current Sink
Notes: All specifications are typical at 25 C unless otherwise stated. 1. Power good delay time is the time from output voltage in full regulation to power good asserted. 2. The power good signal is an open collector output. When the output of the module is higher than 90% of the nominal set point, the power good pin is high.
Output Trim Equation
Equation for calculating the trim resistor (in k) given the desired adjusted voltage (Vadj) is shown below. The Rtrim resistor should be connected between the Trim pin and Ground.
0.992 0.992 Vadj = + 1.18 K + 0.992 5.62 K Rtrim
Vout
Module Trim
GND
Rtrim
Power Good Signal Level Set
Equation for calculating the power good threshold (in k) given the desired adjusted voltage (Vadj) is shown below. The Rset resistor should be connected between the PG_set pin (Pin 9) and Ground.
1.24 - 18.86 10 - 6 + 1.24 PG _ Threshold = 6.19 K 2.21K + Rset
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
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
Efficiency Data
97.0% 96.5% 96.0% 95.5% 95.0% 94.5% 94.0% 93.5% 93.0% 92.5% 92.0% 1.5 3.75 7.5 11.25 15.0
4.5 V 5.0 V 5.5 V
Vo=3.3 V
95.0% 94.0% 93.0% 92.0% 91.0% 90.0% 89.0% 88.0% 87.0% 86.0% 85.0% 1.5 3.75 7.5 11.25 15.0
4.5 V 5.0 V 5.5 V
Vo=1.8 V
92.0% 90.0% 88.0% 86.0% 84.0% 82.0% 80.0% 1.5 3.75 7.5 11.25 15.0 4.5 V 5.0 V 5.5 V
Vo=1.2 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
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
Thermal Derating Curves
Vo=3.3 V
Vo=1.8 V
Vo=1.2 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
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
Ripple and Noise Waveforms
Vout=1.2 V
Vout=1.8 V
Vout=3.3 V
Note: Ripple and noise at max load input=5.0 V, 0-20 MHz BW, with external 5x10 uF/10 V and 0.1 uF/25 V ceramic capacitor, 1000uF electrolytic capacitor 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
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
Transient Response Waveforms
Transients 50% to 75% load, 1.2 Vdc Output
Transients 75% to 50% load, 1.2 Vdc Output
Transients 50% to 75% load, 1.8 Vdc Output
Transients 75% to 50% load, 1.8 Vdc Output
Transients 50% to 75% load, 3.3 Vdc Output
Transients 75% to 50% load, 3.3 Vdc Output
Note: Transient Response at Vin=5 Vdc, with external load capacitor 5 x10 uF/10 V and 0.1 uF/25 V ceramic capacitor and an 1000 uF electrolytic capacitor 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
5.0 Vdc Input 1.2 Vdc - 3.3 Vdc/15 A Output
Mechanical Outline
Pin Connections
Pin 1 2 3 4 5 6 7 8 9 10 11 Function Vo+ Vo+ Vo+ Trim Remote On/Off Power Good Ground Ground PG_Set 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.
(c)2007 Bel Fuse Inc. Specifications subject to change without notice. 012907
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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