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ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
0RFB-S0T280
* * * * * * * * * Isolated
RoHS Compliant
* * * * * * *
Rev.C
Output Over-Voltage Latch Off SCP/OCP (Hiccup Mode) Isolation Remote On/Off Auxiliary Bias Power Inverter Operation Good (Power Good) Heatsink for Extended Operation (Option) Parallel Operation Using Forced Current Sharing (Option)
Fixed Frequency (300 kHz) High Efficiency High Power Density Low Cost Input Over-Voltage Lockout Input Under-Voltage Lockout Basic Isolation Over Temperature Protection Lockout
Description
The 0RFB-S0T280 is an isolated dc/dc converter that operates from a nominal 48 Vdc source. These units will provide up to 700 W of output power from a nominal 48 Vdc input. This unit is designed to be highly efficient and low cost. Features include remote on/off, over current protection, input under-voltage and over-voltage lockout. This converter is provided in an industry standard full brick package.
Part Selection
Output Voltage 28 Vdc Input Voltage 48 Vdc Max. Output Current 25 A Max. Output Power 700 W Typical Efficiency 91% Model Number 0RFB-S0T280
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 Remote On/Off I/O isolation voltage Ambient Temperature Storage Temperature Min -0.3 V -10 mA -40 C -55 C Typ Max 80 V 5 mA 1500 V 100 C 125 C It's the temperature of baseplate. Notes
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
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Input Specifications
Parameter Input Voltage Input Current (no load) Input Current (full 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 Turn-off Voltage Threshold Input Over Voltage Lockout
2
Min 36 V 33 V 31 V 76 V
Typ 48 V 100 mA 40 mA 30 mA 10 mA 34.5 V 33 V 78 V
Max 76 V 150 mA 23 A 60 mA 1A s 35.5 V 34 V 80 V
2
Notes
With simulated source impedance of 15 uH, 5 Hz to 20 MHz; use 2* 220 uF/100 V electrolytic capacitor with ESR = 1 ohm max at 200 kHz
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated
Output Specifications
Parameter Output Voltage Set Point Load Regulation Line Regulation Regulation Over Temperature (-40deg.C-85deg.C) Output Current Range Output Voltage Trim Range Output DC Current Limit Ripple and Noise (rms) Ripple and Noise (pk-pk) Turn on Time Overshoot at Turn on Output Capacitance Transient Response 50% ~ 75% Max Load 75% ~ 50% Max Load Overshoot Settling Time Overshoot Settling Time VO=28 V 800 mV 500 uS 800 mV 500 uS 1200 mV 800 uS 1200 mV 800 uS di/dt=0.1A/us, Vin=48 Vdc, with a 1 F ceramic capacitor and a 470 uF low ESR aluminum load capacitor at output, Ta=25 C. Min 27.72 V 0A 16.8 V 26.25 A 20 mS 0 uF Typ 28.00 V 30 A 40 mS 0% Max 28.28 V 56 mV 56 mV 300 mV 25 A 32.2 V 35 A 80 mV 280 mV 80 mS 2% 5000 uF Over all load, line and temperature conditions. Notes Vin=48 V, full load
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
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
General Specifications
Parameter Efficiency Switching Frequency Isolation Capacitance Isolation Resistance Input to Output Input to Case Output to Case Auxiliary Output Voltage
1 2
Min 88% 10 M Ohm 7V 0V 33 V
Typ 91% 300 kHz 1500 pF -
Max 1500 V 1500 V 500 V 10 V 35 V 2V
Notes Vin=48 V, full load
IOG Pin Max Applied Voltage
Remote Sense compensation Over Temperature Protection Over Voltage Protection
105 -
35.8 V
It's the temperature of baseplate.
Temperature Limits for Power Derating Curves Semiconductor Junction Temperature PCB Board Temperature Transformer Temperature MTBF Dimensions Inches millimeters Weight 4.60 x 2.40 x 0.50 116.8 x 61.0 x 12.69 150 g TBD 120 125 125 Calculated Per Bell Core SR-332 (Vin=48 V, Io=normal , Ta = 25 C)
Notes: 1. Aux pin source current <=20 mA, ground for the AUX terminal is -S terminal. 2. The signal is low when inverter is normally operating and HIGH when inverter stops or operating abnormally, maximum sink current is 5 mA. All specifications are typical at 25 C unless otherwise stated.
Control Specifications
Parameter Remote On/Off The Converter ON Isink The Converter Off -10 mA 0 mA 1 mA 5 mA Min Typ Max Notes
Note: +ON/OFF, -ON/OFF terminal, Isolation withstand voltage to input or output or baseplate:500 Vdc.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Output Trim Equations
1. Equations for calculating the trim resistor are shown below. The Trim Down resistor should be connected between the Trim pin and Sense(-) pin. The Trim Up resistor should be connected between the Trim pin and the Sense(+) pin. Only one of the resistors should be used for any given application.
Sense(+)
Rtrimdown =
600 - 6 [k ] delta
Module
Trim Rtrimdown Sense(-)
(100 + delta) Vo 6 - 600 Rtrimup = - 6[ k ] delta
Sense(+) Rtrimup Module Trim Sense(-)
Note:
delta =
(Vo _ req - Vo ) x 100 [% ]
Vo
Vo_req=Desired(trimmed) output voltage[V], Output voltage Vo=28 V
2. Output Voltage Adjustement by applying external voltage: Vout=Trim Terminal Voltage X Nominal Output Volgage.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Efficiency Data
95.0% EFFICIENCY 90.0% 85.0% 80.0% 75.0% 70.0% 2.50 36 V 48 V 76 V
6.25
12.50
18.75
25.0
OUTPUT CURRENT(A)
Thermal Derating Curve
Notes: 1. VIN=48 V, with maximum junction temperature of semiconductors derated to 120C. 2. Custom need to add extended heatsink to keep the baseplate temperature.
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Ripple and Noise Waveforms
Ripple and noise at no load, 36 Vdc input
Ripple and noise at full load, 36 Vdc input
Ripple and noise at no load, 48 Vdc input
Ripple and noise at full load, 48 Vdc input
Ripple and noise at no load, 76 Vdc input
Ripple and noise at full load, 76 Vdc input
Note: Ripple and noise at 0-20MHz BW, with a 10 uF and a 1 uF ceramic cap, 28 Vdc 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
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Transients Response Waveforms
50%-75% Load Transients at Vin=36 V
75%-50% Load Transients at Vin=36 V
50%-75% Load Transients at Vin=48 V
75%-50% Load Transients at Vin=48 V
50%-75% Load Transients at Vin=76 V
75%-50% Load Transients at Vin=76 V
Note: Transient response with external electrolytic cap 4700 uF, 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
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Mechanical Outline
Bel Fuse Inc. 206 Van Vorst Street, Jersey City, NJ 07302 * Tel 201-432-0463 * Fax 201-432-9542 * www.belfuse.com
ISOLATED DC/DC CONVERTERS
48 Vdc Input 28 Vdc /25 A Output
Mechanical Outline (continued)
Pin Connections
Pin 1 2 3 4 5 6 7 8 Function Pin Size Pin 9 10 11 12 13 14 15 16 Function Pin Size
Vin(-) Vin(+) On/Off(-) On/Off(+) Vout(+) Vout(+) Vout(+) Vout(-)
0.079'' 0.079'' 0.039'' 0.039'' 0.079'' 0.079'' 0.079'' 0.079''
Vout(-) Vout(-) SENSE(-) SENSE(+) TRIM PC IOG AUX
0.079'' 0.079'' 0.039'' 0.039'' 0.039'' 0.039'' 0.039'' 0.039''
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and other hazardous substances from electronic products.
(c)2008 Bel Fuse Inc. Specifications subject to change without notice. 050808
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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