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ISOLATED DC/DC CONVERTERS
48 Vdc Input 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
xRSB-50T Series
* Isolated * Fixed Frequency (600 kHz) * High Efficiency * High Power Density * Low Cost * Output Voltage Trim * Basic Insulation
RoHS Compliant
* * * * * * *
Rev.C
Input Under Voltage Lockout Output Over Voltage Shutdown OCP/SCP Over Temperature Protection Remote On/Off (option) Positive/Negative Remote Sense Through Hole and SMT (option)
* UL60950-1 Recognized (UL/cUL)
Description
The xRSB-50T series are isolated dc/dc converters that operate from a nominal 48 Vdc source. These units will provide up to 60 W of output power from a nominal 48 Vdc input. These units are designed to be highly efficient and low cost. Features include remote on/off, over current protection and under voltage lockout. These converters are provided in an industry standard sixteenth brick package.
Part Selection
Output Voltage 1.2 V 1.5 V 1.8 V 2.5 V 3.3 V 5.0 V 12 V Input Voltage 36 V - 75 V 36 V - 75 V 36 V - 75 V 36 V - 75 V 36 V - 75 V 36 V - 75 V 36 V - 75 V Max. Output Current 25 A 22 A 20 A 18 A 15 A 12 A 5A Max. Output Power 30 W 33 W 36 W 45 W 50 W 60 W 60 W Typical Efficiency 84% 85% 87% 87% 89% 90% 89% Model Number Active Low xRSB-50TV2L xRSB-50TV5L XRSB-50TV8L xRSB-50T02L xRSB-50T03L xRSB-50T05L xRSB-50T12L Model Number Active High xRSB-50TV20 xRSB-50TV50 xRSB-50TV80 xRSB-50T025 xRSB-50T033 xRSB-50T050 xRSB-50T120
Notes: 1. Add "G" suffix at the end of the model number to indicate Tray Packaging. Replace"x" with "S" to indicate SMT package, or "0" to indicate through hole package. 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) Input Voltage Transient (100 ms) Remote On/Off I/O Isolation Voltage Ambient Temperature Storage Temperature Min -0.3 V -0.3 V -0.3 V -40 C -55 C Typ Max 80 V 100 V 18 V 1500 V 85 C 125 C Notes
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Input Specifications
Parameter Input Voltage Input Current (full load) Input Current (no 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
2
Min 36 V 31 V 30 V
Typ 48 V 70 mA 1 mA 20 mA 3 mA 0.01 A s 32 V 31 V
2
Max 75 V 2.4 A 120 mA 3 mA 50 mA 7 mA 0.02 A s 35 V 34 V
2
Notes
Tested with simulated source impedance of 15 uH, 5 Hz to 20 MHz; use a 100 uF/100 V electrolytic capacitor with ESR=1 ohm max at 200 kHz at the input.
Note: All specifications are typical at nominal input, full load at 25 C unless otherwise stated.
Output Specifications
Parameter Output Voltage Set Point Vo=1.2 V Vo=1.5 V Vo=1.8 V Vo=2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V Line Regulation Vo=1.2 - 1.8 V Vo=2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V Load Regulation Vo=1.2 - 2.5 V Vo=3.3 - 5.0 V Vo=12 V Regulation Over Temperature(-40 C to +85 C) Vo=1.2 V Vo=1.5 - 1.8 V Vo=2.5 - 3.3 V Vo=5.0 V Vo=12 V Output Current Vo=1.2 V Vo=1.5 V Vo=1.8 V Vo=2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V 0A 0A 0A 0A 0A 0A 0A 25 A 22 A 20 A 18 A 15 A 12 A 5A 1.182 V 1.478 V 1.773 V 2.463 V 3.250 V 4.925 V 11.750 V 1.2 V 1.5 V 1.8 V 2.5 V 3.3 V 5.0 V 12.0 V 1.218 V 1.523 V 1.827 V 2.538 V 3.350 V 5.075 V 12.250 V Test conditions: Vin=48 V; Io=50% load Min Typ Max Notes
0.5 mV 1 mV 3 mV 4 mV 10 mV
3 mV 6 mV 8 mV 9 mV 25 mV
3 mV 4 mV 9 mV
5 mV 9 mV 18 mV
-
4 mV 6 mV 9 mV 15 mV 20 mV
9 mV 14 mV 16 mV 30 mV 35 mV
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Output Specifications (continued)
Parameter Current Limit Threshold Vo=1.2 V Vo=1.5 V Vo=1.8 V Vo=2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V Short Circuit Surge Transient Ripple and Noise (rms) Vo=1.2 - 1.8 V Vo=2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V Ripple and Noise (pk-pk) Vo=1.2 - 1.8 V Vo=2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V Turn on Time Overshoot at Turn on Output Capacitance Vo=1.2 V Vo=1.5 V Vo=1.8 - 2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V Transient Response Overshoot 25% ~ 50% Max Load Settling Time Overshoot 50% ~ 25% Max Load Settling Time Overshoot 25% ~ 50% Max Load Settling Time Overshoot 50% ~ 25% Max Load Settling Time Overshoot 25% ~ 50% Max Load Settling Time Overshoot 50% ~ 25% Max Load Settling Time Overshoot 25% ~ 50% Max Load Settling Time Overshoot 50% ~ 25% Max Load Settling Time Overshoot 25% ~ 50% Max Load Settling Time Overshoot 50% ~ 25% Max Load Settling Time 470 uF 470 uF 470 uF 220 uF 100 uF 22 uF 40 mV 45 mV 55 mV 70 mV 90 mV 35 mS 0% 40 mV 80 uS 40 mV 80 uS 110 mV 110 uS 110 mV 110 uS 150 mV 120 uS 150 mV 120 uS 220 mV 120 uS 220 mV 120 uS 400 mV 150 uS 400 mV 150 uS 70 mV 80 mV 90 mV 120 mV 180 mV 70 mS 5% 20000 uF 15000 uF 10000 uF 5600 uF 4700 uF 470 uF 80 mV 150 uS 80 mV 150 uS 150 mV 180 uS 150 mV 180 uS 250 mV 200 uS 250 mV 200 uS 350 mV 250 uS 350 mV 250 uS 650 mV 300 uS 650 mV 300 uS Min 30 A 28 A 24 A 22 A 19 A 14 A 5.2 A Typ 40 A 34 A 28 A 26 A 22 A 19 A 6.5 A 2 0.5 A s 6 mV 10 mV 12 mV 25 mV 30 mV Max 47 A 40 A 34 A 30 A 26 A 24 A 8.5 A 2 1A s 12 mV 20 mV 25 mV 50 mV 55 mV Notes
Tested at 0-20 MHz BW, with a 1 uF ceramic capacitor and a Tantalum capacitor (refer to the min. output capacitance below for each output) at the output.
Recommend to use AVX TPS series Tantalum capacitor as the min capacitor
Vo=1.2 V
Vo=1.5 - 1.8 V
Vo=2.5 - 3.3 V
Vo=5.0 V
Test conditions: di/dt = 0.1 A/uS, Vin=48 V, with a 1uF ceramic capacitor and a Tantalum capacitor (refer to the min. output capacitance above for each output) at the output.
Vo=12 V
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
General Specifications
Parameter Efficiency Vo=1.2 V Vo=1.5 V Vo=1.8 - 2.5 V Vo=3.3 V Vo=5.0 V Vo=12 V Switching Frequency Isolation Capacitance Output Voltage Trim Range Vo=1.2 - 5.0 V Vo=12 V Over Temperature Protection Over Voltage Protection 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 1.3 x 0.9 x 0.364 33.02 x 22.86 x 9.24 1.3 x 0.9 x 0.378 33.02 x 22.86 x 9.60 13 g SMT Package Min 81% 82% 84% 86% 87% 86% 540 kHz 90% Vo 80% Vo 120 C Typ 84% 85% 87% 89% 90% 89% 600 kHz 3900 pF 130% Vo 2,770,832 hours Max 660 kHz 110% Vo 110% Vo 140 C 160% Vo Test conditions: Vin=48 V, full load and short the feedback optocoupler. Calculated Per Bell Core SR-332 (IO =80% load, Vin=48 V, Vo=5 V; Ta = 25 C) Notes
Vin=48 V, full load
Through Hole Package
Note: All specifications are typical at 25 C unless otherwise stated.
Control Specifications
Parameter Remote On/Off Signal Low (Unit On) Signal High (Unit Off) Signal Low (Unit Off) Signal High (Unit On) Current Sink Active High Active Low -0.3 V 2.95 V -0.3 V 2.95 V 0 mA 0.8 V 18 V 0.8 V 18 V 1 mA When Remote On/Off pin is open, for active low option, unit is off; for active high option, unit is on Min Typ Max Notes
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Output Trim Equations
Equations for calculating the trim resistor are shown below (Unit: k). The Trim Down resistor should be connected between the Trim pin and Ground pin. The Trim Up resistor should be connected between the Trim pin and the Vout. Only one of the resistors should be used for any given application.
1) Trim Equations for Vo=1.2 V
Vout
Rtrimdown =
511 - 10.22 delta
Module
Trim GND Rtrimdown
Rtrimup =
Note:
(100 + delta ) Vo 5.11 - 313 - 10.22 0.6125 delta
Vout
delta =
(Vo _ req - Vo ) x 100[% ]
Vo
Module
Trim GND
Rtrimup
Vo_req=Desired (trimmed) output voltage [V] Vo=1.202 V
2) Trim Equations for Vo=1.5 V - 12 V
Rtrimdown =
511 - 10.22 delta
Rtrimup =
Note:
(100 + delta ) Vo 511 - 626 - 10.22 1.225 delta
delta =
(Vo _ req - Vo ) x 100 [% ]
Vo
Vo_req=Desired (trimmed) output voltage [V] Vo=1.503 V for 1.5 V output; Vo=1.804 V for 1.8 V output; Vo=2.505 V for 2.5 V output; Vo=3.308 V for 3.3 V output; Vo=5.002 V for 5 V output; Vo=12.007 V for 12 V output.
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Efficiency Data
90% 85%
90% 85% EFFICIENCY 80% 75% 70% 65% 60% 55% 50%
6.25A 12.5A 18.75A 25A
EFFICIENCY
80% 75% 70% 65% 60% 55% 50% 2.5A OUTPUT CURRENT (A) 36 V 48 V 75 V
36 V 48 V 75 V
2.2A
5.5A
11A
16A
22A
OUTPUT CURRENT (A)
Vo=1.2 V
Vo=1.5 V
90% 85%
90% 85% EFFICIENCY 80% 75% 70% 65% 60% 55% 50%
2A 5A 10A 15A 20A
EFFICIENCY
80% 75% 70% 65% 60% 55% 50% OUTPUT CURRENT (A) 36V 48V 75V
36V 48V 75V
1.8A
4.5A
9A
12.A
18A
OUTPUT CURRENT (A)
Vo=1.8 V
Vo=2.5 V
90% 85% EFFICIENCY
EFFICIENCY
90% 85% 80% 75% 70% 65% 60% 55% 50% 36 V 48 V 75 V
80% 75% 70% 65% 60% 55% 50% 1.5A 3.75A 7.5A 11.25A 15A OUTPUT CURRENT (A) 36V 48V 75V
1.2A
3A
6A
9A
12A
OUTPUT CURRENT (A)
Vo=3.3 V
Vo=5.0 V
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Efficiency Data (continued)
90% 85% EFFICIENCY 80% 75% 70% 65% 60% 55% 50% 0.5A 1.25A 2.5A 3.75A 5A OUTPUT CURRENT (A) 36 V 48 V 75 V
Vo=12 V
Thermal Derating Curves
Vin=48 V, Vo=1.2 V
Vin=48 V, Vo=1.8 V
Vin=48 V, Vo=2.5 V,
Vin=48 V, Vo=3.3 V
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Thermal Derating Curves (continued)
Vin=48 V, Vo=5.0 V
Vin=48 V, Vo=12 V
Ripple and Noise Waveforms
Vo=1.2 V
Vo=1.8 V
Vo=2.5 V
Vo=3.3 V
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Ripple and Noise Waveforms (continued)
Vo=5.0 V Note: Ripple and Noise at full load, 48 V input, Ta=25 deg C.
Vo=12 V
1) For Vo=1.2 V -2.5 V, with a 1 uF ceramic capacitor and a 470 uF tantalum cap at the output; 2) For Vo=3.3 V, with a 1 uF ceramic capacitor and a 220 uF tantalum cap at the output; 3) For Vo=5.0 V, with a 1 uF ceramic capacitor and a 100 uF tantalum cap at the output; 4) For Vo=12 V, with a 1 uF ceramic capacitor and a 22 uF tantalum cap at the output.
Transient Response Waveforms
Vo=1.2 V 50% to 25% Load Transients
Vo=1.2 V 25% to 50% Load Transients
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Transient Response Waveforms (continued)
Vo=1.8 V 50% to 25% Load Transients
Vo=1.8 V 25% to 50% Load Transients
Vo=2.5 V 50% to 25% Load Transients
Vo=2.5 V 25% to 50% Load Transients
Vo=3.3 V 50% to 25% Load Transients
Vo=3.3 V 25% to 50% Load Transients
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Transient Response Waveforms (continued)
Vo=5 V 50% to 25% Load Transients
Vo=5 V 25% to 50% Load Transients
Vo=12 V 50% to 25% Load Transients
Vo=12 V 25% to 50% Load Transients
Note: Transients Response at Vin=48 V, di/dt=0.1A/uS, Ta=25 deg C.
1) For Vo=1.2 V -2.5 V, with a 1 uF ceramic capacitor and a 470 uF tantalum cap at the output; 2) For Vo=3.3 V, with a 1 uF ceramic capacitor and a 220 uF tantalum cap at the output; 3) For Vo=5.0 V, with a 1 uF ceramic capacitor and a 100 uF tantalum cap at the output; 4) For Vo=12 V, with a 1 uF ceramic capacitor and a 22 uF tantalum cap at the output.
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Mechanical Outline
SMT Package
Pin Connections
Pin 1 2 3 4 5 6 7 8 Function Vin (+) Remote On/Off Vin (-) VoutRemote Sense (-) Trim Remote Sense (+) Vout (+)
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 1.2 Vdc - 12 Vdc / 25 A - 5 A Outputs, 1/16 Brick
Mechanical Outline (continued)
Through Hole Package
Pin Connections
Pin 1 2 3 4 5 6 7 8 Function Vin (+) Remote On/Off Vin (-) VoutRemote Sense (-) Trim Remote Sense (+) Vout (+)
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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