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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
• Isolated • Output Over Voltage Shutdown
• High Efficiency • OCP/SCP
• High Power Density • Over Temperature Protection
• Low Cost • Remote On/Off
• Input Under Voltage Lockout • Output Voltage Trim
• Fixed Frequency (285 kHz)
• Input Over Voltage Lockout
• Active Low/High (Option)
• Positive/Negative Remote Sense
• Basic Isolation
• Safety Approval to UL60950-1
(UL/cUL)
Description
The 0RQB-C0U Series are isolated dc/dc converters that operate from a nominal 48 Vdc source. These units
will provide up to 100 W of output power from a nominal 48 Vdc input. These units are designed to be highly
efficient and low cost. Typical efficiency of 12 Vdc output at 48 Vdc input at full load is 91%. Features include
remote on/off, over current protection and under-voltage lockout. These converters are provided in an industry
standard quarter brick package.
Part Selection
Output
Voltage Input Voltage Max. Output
Current Max. Output
Power Typical
Efficiency Model Number
Active High Model Num b er
Active Low
12 Vdc 18 Vdc - 75 Vdc 8.35 A 100 W 91% 0RQB-C0U120 0RQB-C0U12L
5.0 Vdc 18 Vdc - 75 Vdc 20 A 100 W 90% 0RQB-C0U050 0RQB-C0U05L
3.3 Vdc 18 Vdc - 75 Vdc 25 A 82.5 W 90% 0RQB-C0U033 0RQB-C0U03L
2.5 Vdc 18 Vdc - 75 Vdc 30 A 75 W 89.5% 0RQB-C0U025 0RQB-C0U02L
1.8 Vdc 18 Vdc - 75 Vdc 30 A 54 W 85% 0RQB-C0UV80 0RQB-C0UV8L
1.5 Vdc 18 Vdc - 75 Vdc 30 A 45 W 83% 0RQB-C0UV50 0RQB-C0UV5L
1.2 Vdc 18 Vdc - 75 Vdc 30 A 36 W 80% 0RQB-C0UV20 0RQB-C0UV2L
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 Notes
-0.3 V - 80 V No Operating
Input Voltage (continuous) - - 75 V Operating
Remote On/Off -0.3 V - 18 V
I/O Isolation Voltage - - 2000 V
Ambient Temperature -40 °C - 85 °C
Storage Temperature -55 °C - 125 °C
Note: All specifications are typical at nominal input, full load at 25 °C unless noted.
0RQB-C0U Series RoHS Com
p
liant PRELIMINARY Rev.A
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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Input Specifications
Parameter Min Typ Max Notes
Input Voltage 18 V 48 V 75 V
Input Current (full load)
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
-
-
-
-
-
-
-
-
-
-
-
-
-
-
7.0 A
7.0 A
6.0 A
5.5 A
4.0 A
3.5 A
3.0 A
Input Current (no load) - 100 mA 180 mA
Remote Off Input Current 10 mA 15 mA
Input Reflected Ripple Current (pk-pk) - 20 mA 40 mA
Input Reflected Ripple Current (rms) - 5 mA 10 mA
Tested with simulated source impedance
of 10 uH, 5 Hz to 20 MHz BW; use a
0.47 uf/100 V ceramic cap and a 100 uF
/100 V electrolytic cap with ESR = 1 ohm
max. at 200 kHz at 25 °C.
I2t Inrush Current Transient - 0.05 A2s0.1 A
2s
Turn-on Voltage Threshold 16.5 V 17.0 V 17.5 V
Turn-off Voltage Threshold 15.5 V 16.0 V 16.5 V
Input over voltage Lockout 76 V 78 V 80 V
Note: All specifications are typical at nominal input, full load at 25 °C unless noted.
Output Specifications
Parameter Min Typ Max Notes
Output Voltage Set Point
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
11.820 V
4.925 V
3.251 V
2.455 V
1.773 V
1.448 V
1.182 V
12.00 V
5.00 V
3.30 V
2.50 V
1.80 V
1.50 V
1.20 V
12.180 V
5.075 V
3.360 V
2.545 V
1.827 V
1.523 V
1.218 V
Vin=48 V, Io=50% full
load
Line Regulation
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.2 V-1.8 V
-
-
-
-
-
±24 mV
±10 mV
±4 mV
±4 mV
±
3mV
±120 mV
±25 mV
±15 mV
±10 mV
±
6mV
Load Regulation
VO=12 V
VO=5.0 V
VO=3.3 V -2.5 V
VO=1.2 V -1.8 V
-
-
-
-
±30 mV
±10 mV
±8 mV
±5 mV
±80 mV
±25 mV
±15 mV
±10 mV
Regulation Over Temperature
(-40 °C to +85 °C)
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V-1.2 V
-
-
-
-
-
±60 mV
±40 mV
±30 mV
±20 mV
±15 mV
±100 mV
±65 mV
±50 mV
±50 mV
±30 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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Output Specifications (continued)
Parameter Min Typ Max Notes
Output Current Range
VO=12 V
VO=5.0 V
VO=3.3 V
VO=1.2 V -2.5 V
0 A
0 A
0 A
0 A
-
-
-
-
8.35 A
20 A
25 A
30 A
Current Limit Threshold
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.2 V -1.8 V
9.2 A
24 A
27 A
35 A
-
10.5 A
26 A
32 A
40 A
36 A
13 A
30 A
35 A
45 A
-
Short Circuit Surge Transient - 3 A2s 5 A2s
Vin=48 V ; Ripple and Noise (rms)
VO=12 V
VO=5.0 V
VO=3.3 V -2.5 V
VO=1.2 V -1.8 V
-
-
-
-
30 mV
25 mV
20 mV
15 mV
50 mV
40 mV
40 mV
30 mV
Vin=24 V ; Ripple and Noise (rms)
VO=12 V
VO=5.0 V
VO=3.3 V
VO=1.2 V -2.5 V
-
-
-
-
25 mV
20 mV
15 mV
10 mV
40 mV
30 mV
25 mV
20 mV
Vin=48 V ; Ripple and Noise (pk-pk)
VO=12 V
VO=5.0 V
VO=3.3 V-2.5 V
VO=1.2 V-1.8 V
-
-
-
-
100 mV
75 mV
50 mV
40 mV
150 mV
120 mV
100 mV
80 mV
Vin=24 V ; Ripple and Noise (pk-pk)
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.2 V-1.8 V
-
-
-
-
-
75 mV
50 mV
35 mV
30mV
25 mV
120 mV
100 mV
70 mV
60 mV
50 mV
Test conditions:
0-20 MHz BW, with a
1 uF ceramic capacitor
and a 10 uF Tantalum
capacitor at the output.
Turn on Time 10 mS - 100 mS
Overshoot at Turn on - 0% 5%
Output Capacitance
VO=12.0 V
VO=5.0 V
VO=3.3 V
VO=1.2 V-2.5 V
0 uF
0 uF
0 uF
0 uF
-
-
-
-
1200 uF
6800 uF
15000 uF
20000 uF
Transient Response
Overshoot - 360 mV 480 mV
50% ~ 75%
Max Load Settling Time - 100 uS 250 uS
Overshoot - 360 mV 480mV
75% ~ 50%
Max Load Settling Time
VO=12.0 V
- 150 uS 250 uS
Overshoot - 200 mV 300 mV
50% ~ 75%
Max Load Settling Time - 100 uS 150 uS
Overshoot - 200 mV 300 mV
75% ~ 50%
Max Load Settling Time
VO=5.0 V
- 100 uS 150 uS
Overshoot - 150 mV 200 mV
50% ~ 75%
Max Load Settling Time - 100 uS 100 uS
Overshoot - 150 mV 200 mV
75% ~ 50%
Max Load Settling Time
VO=3.3 V
- 100 uS 100 uS
Test conditions: di/dt =
0.1 A/uS, Vin=48 V,
with a 1 uF ceramic
capacitor and a 10 uF
Tantalum capacitor 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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Output Specifications (continued)
Parameter Min Typ Max Notes
Transient Response
Overshoot - 150 mV 200 mV
50% ~ 75%
Max Load Settling Time - 85 uS 100 uS
Overshoot - 150 mV 200 mV
75% ~ 50%
Max Load Settling Time
VO=2.5 V,
- 85 uS 100 uS
Overshoot - 50 mV 80 mV
50% ~ 75%
Max Load Settling Time - 100 uS 150 uS
Overshoot - 50 mV 80 mV
75% ~ 50%
Max Load Settling Time
VO=1.2 V-1.8 V
- 100 uS 150 uS
Test conditions: di/dt =
0.1 A/uS, Vin=48 V,
with a 1 uF ceramic
capacitor and a 10 uF
Tantalum capacitor at
the output.
Note: All specifications are typical at nominal input, full load at 25 °C unless noted.
General Specifications
Parameter Min Typ Max Notes
Efficiency
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
88%
88%
88%
88%
-
-
-
91%
90%
90%
89.5%
85%
83%
80%
-
-
-
-
-
-
-
Vin=48 V, full load , Ta=25 °C
Efficiency
VO=12 V
VO=5.0 V
VO=3.3 V
VO=2.5 V
VO=1.8 V
VO=1.5 V
VO=1.2 V
-
-
89%
-
-
-
-
92%
91%
91%
87%
85%
83%
80%
-
-
-
-
-
-
-
Vin=24 V, full load , Ta=25 °C
Switching Frequency 240 kHz 285 kHz 320 kHz
Isolation capacitance - 1500 pF -
Input to Output Isolation Voltage - - 2000 V
Remote Sense Compesation - - 10% Vo
Output Voltage Trim Range 80% Vo - 110% Vo
The total voltage increased by trim and
remote sense should not exceed
10%Vo.
Over Temperature Protection - 125 °C -
Over Voltage Protection - 130% Vo - Vin=48V, full load, Hiccup mode
MTBF TBD Calculated Per Bell Core SR-332 (IO =
Nominal; Ta = 25 °C)
Dimensions
Inches
millimeters
2.30 x 1.45 x 0.395
58.42 x 36.83 x 10.03
Weight - 40 g -
Note: All specifications are typical at nominal input, full load at 25 °C unless noted.
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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Control Specifications
Parameter Min Typ Max Notes
Remote On/Off
Signal Low (Unit On) -0.3 V - 0.8 V
Signal High (Unit Off)
Active Low
2.4 V - 18 V
0RQB-C0UxxL. The remote
on/off pin open, Unit off.
Signal Low (Unit Off) -0.3 V - 0.8 V
Signal High (Unit On)
Active High
2.4 V - 18 V
0RQB-C0Uxx0. The remote
on/off pin open, Unit on.
Current Sink 0 mA - 0.75 mA
Output Trim Equations
Equations for calculating the trim resistor are shown below (Unit: kΩ). 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) For Vo=1.5 V - 12 V:
2) For Vo=1.2 V:
Notes:
Vo_req=Desired (trimmed) output voltage [V]; Vo=output voltage
22.10
225.1 62611.5)100( −
⋅
−
⋅⋅+
=delta
Vodelta
Rtrimup
22.10
511 −= delta
Rtrimdown
Module
Vout
Trim
GND Rtrimdow
n
Module
Vout
Trim
GND
Rtrimup
22.10
6125.0 31311.5)100( −
⋅
−
⋅⋅+
=delta
Vodelta
Rtrimup
22.10
511 −= delta
Rtrimdown
()
[]
%100
_×
−
=Vo VoreqVo
delta
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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Efficiency Data
45%
55%
65%
75%
85%
95%
3A 7.5A 15A 22.5A 30A
OUTPUT CURRENT ( A)
EFFICIENCY
18 V
24V
48 V
75 V
系列1
45.0%
55.0%
65.0%
75.0%
85.0%
95.0%
2.5 6.25 12.5 18.75 25
OUTPUT CURRENT (A)
EFFICIENCY
18 V
24V
48 V
75
V
Vo=2.5 V Vo=3.3 V
70%
75%
80%
85%
90%
95%
2A 5A 10A 15A 20A
O U TPUT CU RRENT ( A)
EFFICIENC
Y
18 V
24V
48 V
75 V
70%
75%
80%
85%
90%
95%
0.83A 2.075A 4.15A 6.225A 8.3A
OUTPUT CURRENT (A)
EFFICIENCY
18 V
24V
48 V
75
V
Vo=5.0 V Vo=12 V
Thermal Derating Curves
Vo=2.5 V, Vin=48 V Vo=3.3 V, Vin=48 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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Thermal Derating Curves (continued)
Vo=5.0 V, Vin=48 V Vo=12 V, Vin=48 V
Ripple and Noise Waveforms
2.5 V/30 A output 3.3 V/25 A 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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Ripple and Noise Waveforms (continued)
5.0 V/20 A output 12 V/8.35 A output
Note: Ripple and noise at full load, 48 V input, with a 1 uF ceramic capacitor and a 10 uF tantalum capacitor at
the output, and Ta=25 deg C.
Transient Response Waveforms
Vout= 2.5 V 50%-75% Load Transients at Vin=48 V Vout= 2.5 V 75%-50% Load Transients at Vin=48 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 CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Transient Response Waveforms (continued)
Vout= 3.3 V 50%-75% Load Transients at Vin=48 V Vout= 3.3 V 75%-50% Load Transients at Vin=48 V
Vout= 5.0 V 50%-75% Load Transients at Vin=48 V Vout= 5.0 V 75%-50% Load Transients at Vin=48 V
Vout= 12 V 50%-75% Load Transients at Vin=48 V Vout= 12 V 75%-50% Load Transients at Vin=48 V
Note: Transients at di/dt = 0.1 A/uS, Vin=48 V, with a 1 uF ceramic capacitor and a 10 uF Tantalum capacitor at
the output, Ta=25 deg C.
©
2007 Bel Fuse Inc. Specifications subject to change without notice. 030307
CORPORATE FAR EAST EUROPE
Bel Fuse Inc. Bel Fuse Ltd. Bel Fuse Europe Ltd.
206 Van Vorst Street 8F/ 8 Luk Hop Street Preston Technology Management Centre
Jersey City, NJ 07302 San Po Kong Marsh Lane, Suite G7, Preston
Tel 201-432-0463 Kowloon, Hong Kong Lancashire, PR1 8UD, U.K.
Fax 201-432-9542 Tel 852-2328-5515 Tel 44-1772-556601
www.belfuse.com Fax 852-2352-3706 Fax 44-1772-888366
www.belfuse.com www.belfuse.com
ISOLATED DC/DC CONVE RT ERS
48 Vdc Input, 12 Vdc/8.35 A, 5 Vdc/20 A, 3.3 Vdc/25 A, 1.2-2.5 Vdc/30 A Outputs
Mechanical Outline
RoHS Compliance
Complies with the European Directive 2002/95/EC, calling for the elimination of lead and
other hazardous substances from electronic products.
Pin Connections
Pin Function Pin Size
1 Vin (+) 0.04"
2 Remote On/Off 0.04"
3 Vin (-) 0.04"
4 Vout (-) 0.062"
5 Remote Sense (-) 0.04"
6 Trim 0.04"
7 Remote Sense (+) 0.04"
8 Vout (+) 0.062"
