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NON-ISOLATED DC/DC CONVERTERS
12 V Input 0.9 V-5.0 V/20 A Output
XRPF-20A1A0
* * * * * * Non-Isolated Fixed Frequency (275 kHz) High Efficiency High Power Density Power Good Output Signal (open collector) Under-Voltage Lockout (UVLO)
RoHS Compliant
* * * * * Wide Trim Range Converter Can Sink and Source Current OCP/SCP Remote On/Off Low Cost
Description
The Bel XRPF-20A1A0 is a new high density open frame non-isolated converter series for space sensitive applications. Each model has a wide input range (10.2V-13.8V) and offers a wide range of output voltage (0.9 V - 5.0 V) with a 20 A load. An external resistor adjusts the output voltage from its pre-set value of 0.9 V to any value up to the 5.0 V maximum. Typical efficiency is 92% at Vo=5 V, Vin=12 V at full load. Typical features include remote on/off, under-voltage lockout, over-current protection and short circuit protection.
Part Selection
Output Voltage 0.9 V - 5.0 V Input Voltage 12 V Max. Output Current 20 A Max. Output Power 100 W Typical Efficiency 92% Model Number Vertical Mount VRPF-20A1A0 Model Number Horizontal Mount 0RPF-20A1A0
Note: Add "G" suffix at the end of the model number to indicate 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 13.8 V 13.8 V 80 C 125 C Notes
Input Specifications
Parameter Input Voltage Input Current (Source) Vo=5.0 V Vo=2.5 V Vo=0.9 V Input Current (Sink) Vo=2.5 V Vo=0.9 V Input Current (No Load) Remote Off Input Current -3.44 A -0.97 A 95 mA 5 mA 10 mA Min 10.2 V Typ 9.1 A 4.9 A 2.2 A Max 13.8 V Able to sink 20 A output current at any output voltage up to and including 2.5 V. 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
12 V Input 0.9 V-5.0 V/20 A Output
Input Specifications (continued)
Parameter Input Reflected Ripple Current (pk-pk) Vo=5.0 V Vo=3.3 V Vo=2.5 V Vo=0.9 V Input Reflected Ripple Current (rms) Vo=5.0 V Vo=3.3 V Vo=2.5 V Vo=0.9 V External Input Capacitance Turn-on Voltage Threshold Turn-off Voltage Threshold Min 8.5 V 7.0 V Typ 280 mA 250 mA 200 mA 150 mA 80 mA 70 mA 45 mA 40 mA 540 uF 9.0 V 7.6 V Max 350 mA 320 mA 280 mA 250 mA 120 mA 100 mA 80 mA 60 mA 9.5 V 8.3 V Notes
Tested with simulated source impedance of 1.5 uH 5Hz to 20 MHz, and 2 x 270 uF/16 V Oscon capacitors (ESR 20 m) at the input
Note: All specifications are typical at 25 C unless otherwise stated.
Output Specifications
Parameter Output Voltage Set Point Output Voltage Set Point Load Regulation Vo=5.0 V Vo=3.3 V Vo=2.5 V Vo=0.9 V Line Regulation Output Ripple and Noise (pk-pk) Vo=5.0 V Vo=3.3 V Vo=2.5 V Vo=0.9 V Output Ripple and Noise (rms) Vo=5.0 V Vo=3.3 V Vo=2.5 V Vo=0.9 V Output Current Current Limit Threshold Short Circuit Surge Transient Turn on Time Overshoot at Turn on Output Capacitance Vo=5.0 V Vo=2.5 V Vo=0.9 V Transient Response 50% ~ 75% Max Load Settling Time VO=0.9 V5.0 V 75% ~ 50% Max Load Settling Time 0A 25 A 680 uF 680 uF 680 uF 65 mV 60 mV 55 mV 45 mV 18 mV 15 mV 15 mV 10 mV 5 mS 0%Vo 100 mV 40 uS 100 mV 40 uS 0.4%Vo,set 0.4%Vo,set 0.5%Vo,set 1%Vo,set 0.5%Vo,set 80 mV 75 mV 70 mV 55 mV 25 mV 25 mV 20 mV 15 mV 20 A 40 A 0.1 A2s 10 mS 3%Vo 5080 uF 7840 uF 11000 uF 150 mV 80 uS 150 mV 80 uS Test conditions: di/dt=2.5 A/uS; Vin=12 V; with a 680 uF/6.3 V Oscon capacitor (ESR 12 m), 10 uF/16 V Tantalum capacitor, and 10 nF ceramic capacitor at the output. Io=Iomin to Iomax Min -2.5%Vo,set -3.5%Vo,set Typ Max 2.5%Vo,set 3.5%Vo,set Notes Vin=12 V, lo=lomax, full load Over all operating input voltage, resistive load, and temperature conditions
Vin=Vinmin to Vinmax Tested at 0-20 MHz BW, with a 680 uF/6.3 V Oscon capacitor (ESR 12 m), 10uF/16V Tantalum capacitor, and 10nF 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
12 V Input 0.9 V-5.0 V/20 A Output
Min 89% 86% 83% 65% 79% 60% 240 kHz 0.9 V Typ 92% 89% 86% 69% 82% 63% 275 kHz 5,570,000 hours 1.2 x 1.1 x 0.457 30.48 x 27.94 x 11.6 1.2 x 1.1 x 0.508 30.48 x 27.94 x 12.91 15 g Max 310 kHz 5.0 V Notes
General Specifications
Parameter Efficiency (Current Source) Vo=5.0 V Vo=3.3 V Vo=2.5 V Vo=0.9 V Efficiency (Current Sink) Vo=2.5 V Vo=0.9 V Switching Frequency Output Voltage Trim Range MTBF Dimensions Inches (L x W x H) Millimeters (L x W x H) Dimensions Inches (L x W x H) Millimeters (L x W x H) Weight
Measured at Vin=12 V, full load.
Vo=0.9 V when the Trim pin is open. Calculated Per Bell Core SR-332 (IO = Nominal; Ta = 25 C)
VRPF-20A1A0 0RPF-20A1A0
-
-
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) Power Good Power Good Delay
1
Min -0.3 V 2.4 V -
Typ -
Max 0.8 V 13.8 V 8 mS
Notes Remote On/Off pin open, unit on.
Note: All specifications are typical at 25 C unless otherwise stated. 1. the power good signal is an open collector output. When the output of the module reaches 90% of the nominal set point, the power good pin is set high.
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. Trim values should not be less than 280.
Rtrim =
1.17 Vadj - 0.9
Vout
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
Rs x (1.3Vt - 1.17 ) Rt = 1.17 - Rs x (Vadj - 0.9 )
Module
Rt
Trim
Rs
GND
Vt
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
12 V Input 0.9 V-5.0 V/20 A Output
Efficiency Data
5.0V Vout(SOURCE) 93.0% Efficiency 90.0% 87.0% 84.0% 81.0% 78.0%
2.0 5.0 10.0 15.0 20.0 10.2V 12.0V 13.8V
Output Current (A)
2.5V Vout(SOURCE)
91.0% 88.0% Efficiency 85.0% 82.0% 79.0% 76.0% 73.0% 2.0 5.0 10.0 Output Current (A) 15.0 20.0
10.2V 12.0V 13.8V
0.9V Vout(SOURCE)
85.0% 80.0% 75.0% Efficiency 70.0% 65.0% 60.0% 55.0% 50.0% 2.0 5.0 10.0 Output Current (A) 15.0 20.0
10.2V 12.0V 13.8V
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
12 V Input 0.9 V-5.0 V/20 A Output
Thermal Derating Curves
Vo=5 V; Vin=12 V
Vo=2.5 V; Vin=12 V
Vo=0.9 V; Vin=12 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
12 V Input 0.9 V-5.0 V/20 A Output
VRPF-20A1A0
Pin Connections
Pin 1 2 3 4 5 6 7 8 9 10 11 Function Vout Vout Vout Trim Remote On/Off Power Good Ground Ground Reserved Vin Vin
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
12 V Input 0.9 V-5.0 V/20 A Output
0RPF-20A1A0
Pin Connections
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 Function Vout Vout Vout Trim Remote On/Off Power Good Ground Ground Pwrgd_set Vin Vin Support Pin Support Pin
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products.
(c)2005 Bel Fuse Inc. Specifications subject to change without notice. 082405
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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