ISOLATED DC/DC CONVERTERS
48 Vdc Input,
12 Vdc/8.35 A Output
0RQB-C0U12C
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Isolated
High Efficiency
High Power Density
Low Cost
RoHS Compliant
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PRELIMINARY
Rev.A
Output Over Voltage Shutdown
OCP/SCP
Over Temperature Protection
Remote On/Off
Positive/Negative Remote Sense
Basic Isolation
Output Voltage Trim
Input Under Voltage Lockout
Fixed Frequency (285 kHz)
Input Over Voltage Lockout
Description
The 0RQB-C0U12C is an isolated dc/dc converter that operates from a nominal 48 Vdc source. This unit will
provide up to 100 W of output power from a nominal 48 Vdc input. This unit is designed to be highly efficient and
low cost. Typical efficiency at 48 Vdc input at full load is 91%. Features include over current protection and
under-voltage lockout. These converters are provided in an industry standard quarter brick package.
Part Selection
Output
Voltage
12 Vdc
Input Voltage
18 Vdc - 75 Vdc
Max. Output
Current
8.35 A
Max. Output
Power
100 W
Typical
Efficiency
91%
Model Number
Active Low
0RQB-C0U12C
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 (continuous)
Remote On/Off
I/O Isolation Voltage
Ambient Temperature
Storage Temperature
Min
-0.3 V
-
-0.3 V
-
-40
°C
-55
°C
Typ
-
-
-
-
-
-
Max
80 V
75 V
18 V
2000 V
85
°C
125
°C
No Operating
Operating
Notes
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 CONVERTERS
48 Vdc Input,
12 Vdc/8.35 A Output
Input Specifications
Parameter
Input Voltage
Input Current (full load)
Input Current (no load)
Remote Off Input Current
Input Reflected Ripple Current (pk-pk)
-
Min
18 V
-
-
Typ
48 V
-
100 mA
10 mA
20 mA
Max
75 V
7.0 A
180 mA
15 mA
40 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.
Notes
Input Reflected Ripple Current (rms)
I t Inrush Current Transient
Turn-on Voltage Threshold
Turn-off Voltage Threshold
Input over voltage
Lockout
2
-
-
16.5 V
15.5 V
76 V
5 mA
0.05 A s
17.0 V
16.0 V
78 V
2
10 mA
0.1 A s
17.5 V
16.5 V
80 V
2
Note:
All specifications are typical at nominal input, full load at 25
°C
unless noted.
Output Specifications
Parameter
Output Voltage Set Point
Line Regulation
Load Regulation
Regulation Over Temperature
(-40
°C
to +85
°C)
Output Current Range
Current Limit Threshold
Short Circuit Surge Transient
Vin=48 V ; Ripple and Noise (rms)
Vin=24 V ; Ripple and Noise (rms)
Vin=48 V ; Ripple and Noise (pk-pk)
Vin=24 V ; 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
V
O
=12.0 V
-
-
-
-
360 mV
100 uS
360 mV
150 uS
480 mV
250 uS
480mV
250 uS
di/dt = 0.1 A/uS, Vin=48
V, with a 1 uF ceramic
capacitor and a 10 uF
Tantalum capacitor at the
output.
-
-
0A
9.2 A
-
-
-
-
-
10 mS
-
0 uF
Min
11.820 V
Typ
12.00 V
±24
mV
±30
mV
±60
mV
-
10.5 A
3A s
30 mV
25 mV
100 mV
75 mV
-
0%
-
2
Max
12.180 V
±120
mV
±80
mV
±100
mV
8.35 A
13 A
5A s
50 mV
40 mV
150 mV
120 mV
100 mS
5%
1200 uF
2
Notes
Vin=48 V, Io=50% full load
Test conditions:
0-20 MHz BW, 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.
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,
12 Vdc/8.35 A Output
General Specifications
Parameter
Efficiency
Efficiency
Switching Frequency
Isolation capacitance
Input to Output Isolation Voltage
Remote Sense Compesation
Output Voltage Trim Range
Over Temperature Protection
Over Voltage Protection
MTBF
Dimensions
Inches
millimeters
Weight
-
2.30 x 1.45 x 0.395
58.42 x 36.83 x 10.04
40 g
Min
88%
-
240 kHz
-
-
-
80% Vo
-
-
Typ
91%
92%
285 kHz
1500 pF
-
-
-
125
°C
130% Vo
TBD
Max
-
-
320 kHz
-
2000 V
10% Vo
110% Vo
-
-
Vin=48 V, full load, Hiccup mode
Calculated Per Bell Core SR-332 (I
O
=
Nominal; T
a
= 25
°C)
The total voltage increased by trim and
remote sense should not exceed
10%Vo.
Notes
Vin=48 V, full load , Ta=25
°C
Vin=24 V, full load , Ta=25
°C
-
Note:
All specifications are typical at nominal input, full load at 25
°C
unless noted.
Control Specifications
Parameter
Remote On/Off
Signal Low (Unit On)
Signal High (Unit Off)
Current Sink
Active Low
-0.3 V
2.4 V
0 mA
-
-
-
0.8 V
18 V
0.75 mA
The remote on/off pin open, Unit
off.
Min
Typ
Max
Notes
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.
511
Rtrimdown
=
−
10.22
delta
Rtrimup
=
Notes:
Vout
Module
Trim
GND
Rtrimdown
(100
+
delta
)
⋅
Vo
⋅
5.11
−
626
−
10.22
1.225
⋅
delta
Module
Vout
Trim
GND
Rtrimup
(
Vo
_
req
−
Vo
)
×
100
[
%
]
delta
=
Vo
Vo_req=Desired (trimmed) output voltage [V]; Vo=output voltage
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,
12 Vdc/8.35 A Output
Efficiency Data
95%
90%
EFFICIENCY
85%
80%
75%
70%
0.83A
2.075A
4.15A
6.225A
8.3A
OUTPUT CURRENT (A)
18 V
24V
48 V
75 V
Vo=12 V
Thermal Derating Curve
Vo=12 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 CONVERTERS
48 Vdc Input,
12 Vdc/8.35 A Output
Ripple and Noise Waveform
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= 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.
Bel Fuse Inc.
206 Van Vorst Street, Jersey City, NJ 07302
•
Tel 201-432-0463
•
Fax 201-432-9542
•
www.belfuse.com
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