ISOLATED DC/DC CONVERTERS 48 Vdc Input 28 Vdc /25 A Output 0RFB-S0T280 • RoHS Compliant • Isolated Rev.C Output Over-Voltage Latch Off • Fixed Frequency (300 kHz) • SCP/OCP (Hiccup Mode) • High Efficiency • Isolation Remote On/Off • High Power Density • Auxiliary Bias Power • Low Cost • • Input Over-Voltage Lockout • Input Under-Voltage Lockout • Basic Isolation • Over Temperature Protection Lockout Inverter Operation Good (Power Good) • Heatsink for Extended Operation (Option) • Parallel Operation Using Forced Current Sharing (Option) 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 Input Voltage Max. Output Current Max. Output Power Typical Efficiency Model Number 28 Vdc 48 Vdc 25 A 700 W 91% 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 Min Typ Max Input Voltage -0.3 V - 80 V Remote On/Off -10 mA - 5 mA - - 1500 V Ambient Temperature -40 °C - 100 °C Storage Temperature -55 °C - 125 °C I/O isolation voltage Notes It's the temperature of baseplate. 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 Min Typ Max 36 V 48 V 76 V Input Current (no load) - 100 mA 150 mA Input Current (full load) - - 23 A Remote Off Input Current - 40 mA 60 mA Input Reflected Ripple Current (pk-pk) - 30 mA - Input Reflected Ripple Current (rms) - 10 mA - I t Inrush Current Transient - - 1A s Turn-on Voltage Threshold 33 V 34.5 V 35.5 V Turn-off Voltage Threshold 31 V 33 V 34 V Input Over Voltage Lockout 76 V 78 V 80 V Input Voltage 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 2 Note: All specifications are typical at nominal input, full load at 25 °C unless otherwise stated Output Specifications Parameter Min Typ Max 27.72 V 28.00 V 28.28 V Load Regulation - - 56 mV Line Regulation - - 56 mV Regulation Over Temperature (-40deg.C-85deg.C) - - 300 mV 0A - 25 A Output Voltage Trim Range 16.8 V - 32.2 V Output DC Current Limit 26.25 A 30 A 35 A Ripple and Noise (rms) - - 80 mV Ripple and Noise (pk-pk) - - 280 mV 20 mS 40 mS 80 mS - 0% 2% 0 uF - 5000 uF Output Voltage Set Point Output Current Range Turn on Time Overshoot at Turn on Output Capacitance Notes Vin=48 V, full load Over all load, line and temperature conditions. Transient Response 50% ~ 75% Max Load 75% ~ 50% Max Load Overshoot - 800 mV 1200 mV - 500 uS 800 uS Overshoot - 800 mV 1200 mV Settling Time - 500 uS 800 uS Settling Time VO=28 V di/dt=0.1A/us, Vin=48 Vdc, with a 1 µF ceramic capacitor and a 470 uF low ESR aluminum load capacitor at output, Ta=25 °C. 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 Min Typ Max 88% 91% - Switching Frequency - 300 kHz - Isolation Capacitance - 1500 pF - 10 M Ohm - - Input to Output - - 1500 V Input to Case - - 1500 V - - 500 V 7V - 10 V IOG Pin Max Applied Voltage - - 35 V Remote Sense compensation 0V Over Temperature Protection - 105 ℃ - 33 V - 35.8 V Efficiency Isolation Resistance Output to Case 1 Auxiliary Output Voltage 2 Over Voltage Protection Notes Vin=48 V, full load 2V It's the temperature of baseplate. Temperature Limits for Power Derating Curves Semiconductor Junction Temperature - - 120 ℃ PCB Board Temperature - - 125 ℃ Transformer Temperature - - 125 ℃ MTBF Calculated Per Bell Core SR-332 (Vin=48 V, Io=normal , Ta = 25 °C) TBD Dimensions Inches millimeters Weight 4.60 x 2.40 x 0.50 116.8 x 61.0 x 12.69 - 150 g - 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 Min Typ Max 1 mA - 5 mA -10 mA - 0 mA Notes Remote On/Off The Converter ON Isink The Converter Off 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 Ω ] delta Module Trim Rtrimdown Sense(-) (100 + delta) ⋅Vo ⋅ 6 − 600 Rtrimup = − 6[ k Ω] delta Sense(+) Rtrimup Module Trim Sense(-) Note: delta = (Vo _ req − Vo ) × 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 EFFICIENCY 95.0% 90.0% 36 V 85.0% 48 V 76 V 80.0% 75.0% 70.0% 2.50 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 Function Pin Size Pin Function Pin Size 1 Vin(-) 2 0.079’’ 9 Vout(-) 0.079’’ Vin(+) 0.079’’ 10 3 Vout(-) 0.079’’ On/Off(-) 0.039’’ 11 SENSE(-) 0.039’’ 4 On/Off(+) 0.039’’ 12 SENSE(+) 0.039’’ 5 Vout(+) 0.079’’ 13 TRIM 0.039’’ 6 Vout(+) 0.079’’ 14 PC 0.039’’ 7 Vout(+) 0.079’’ 15 IOG 0.039’’ 8 Vout(-) 0.079’’ 16 AUX 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. ©2008 Bel Fuse Inc. Specifications subject to change without notice. 050808 CORPORATE FAR EAST EUROPE Bel Fuse Inc. 206 Van Vorst Street Jersey City, NJ 07302 Tel 201-432-0463 Fax 201-432-9542 www.belfuse.com 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 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