RoHS lead-free solder and lead-solder-exempted
products are available
Delivers up to 25 A of output (13.5 A @ 70 °C, 200 LFM)
Industry-standard half-brick pinout
Optional baseplate attachment
On-board input differential LC-filter
Startup into pre-biased load
No minimum load required
Dimensions: 2.40” x 2.28” x 0.50”
(61.0 mm x 57.9 mm x 12.7 mm)
Meets Basic Insulation requirements of EN60950
Withstands 100 V input transient for 100 ms
Fixed frequency operation
Remote output voltage sense
Fully protected with automatic recovery
Positive or negative logic ON/OFF option
Output voltage trim range: +10%/−20% with industry-
standard trim equations
High reliability: MTBF approx. 8.7 million hours,
calculated per Telcordia TR-332, Method I Case 1
Recognized to UL60950-1/CSA 22.2 No. 60950-1, and
TUV approved to IEC_EN60950-1
Designed to meet Class B conducted emissions per
FCC and EN55022 when used with external filter
All materials meet UL94, V-0 flammability rating
The HBC48T25120 power module is an open frame half-
brick DC-DC converter providing a regulated and isolated
output voltage of 12.0 VDC with an output current up to 25
A suitable for today’s Distributed Power Architecture
applications. It offers outstanding thermal performance in
high temperature environments.
This performance is accomplished through the use of
patented/patent-pending
circuits,
packaging,
and
processing techniques to achieve ultra-high efficiency,
excellent thermal management, and a low mechanical
profile.
This low-body profile minimizes impedance to system
airflow, thereby enhancing cooling for both upstream and
downstream devices. For extended cooling purposes, a
baseplate option is available. Attaching a heat sink or cold
plate further enhances the unit’s capability. The use of 100%
automation for assembly, coupled with advanced electronic
circuits and thermal design, results in a product with
extremely high reliability.
Operating from a 36-75 V input, the HBC48T25120 converter
provides an output that can be trimmed from –20% to +10%
of the nominal output voltage, thereby providing outstanding
design flexibility.
North America
+1-866.513.2839
Asia-Pacific
+86.755.29885888
Europe, Middle East
+353 61 225 977
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00627_AA
HBC48T25120
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vi n = 48 VDC, unless otherwise specified.
PARAMETER
Absolute Maximum Ratings
Input Voltage
Operating Ambient Temperature
Operating Temperature
Component (Tc)
Baseplate (Tb)
Storage Temperature
Isolation Characteristics
Input to Output Isolation
Input to Case Isolation
Output to Case Isolation
Isolation Capacitance
Isolation Resistance
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
1
Remote Sense Compensation
1
Output Overvoltage Protection
Overtemperature Shutdown
Component (Tc) Non-latching
Baseplate (Tb)
Auto-Restart Period
Turn-On Time from Vin
Turn-On Time from enable
ON/OFF Control (Positive Logic)
Converter Off (logic low)
Converter On (logic high)
ON/OFF Control (Negative Logic)
Converter Off (logic high)
Converter On (logic low)
Input Characteristics
Operating Input Voltage Range
Input Under Voltage Lockout
Turn-on Threshold
Turn-off Threshold
Input Voltage Transient
Maximum Input Current
Input Stand-by Current
Input No Load Current (0 load on the output)
Input Reflected-Ripple Current
Input Voltage Ripple Rejection
100 ms
12 VDC Out @ 25 ADC, Vin= 36 VDC
Vin = 48 V, converter disabled
Vin = 48 V, converter enabled
25 MHz bandwidth
120 Hz
3
75
20
65
Non-latching
33
31
34
32
35
33
100
10
VDC
VDC
VDC
ADC
mADC
mADC
mA
PK-PK
dB
36
48
75
VDC
2.4
-20
20
0.8
VDC
VDC
-20
2.4
0.8
20
VDC
VDC
Applies to all protection features
Time from UVLO to Vo=90%Vo-nom
Time from Enable to Vo=90%Vo-nom
140
125
200
50
4
°C
°C
ms
ms
ms
Industry-std. equations
Percent of V
OUT
(
NOM
)
Latching
117
122
-20
360
+10
+10
127
kHz
%
%
%
10
1500
1500
1500
2.5
VDC
VDC
VDC
ηF
MΩ
-40
-40
-55
125
110
125
°C
°C
°C
Continuous
Transient (100 msec)
0
-40
75
100
85
VDC
VDC
°C
NOTES
MIN
TYP
MAX
UNITS
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00627_AA
HBC48T25120
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
Output Ripple and Noise – 25 MHz bandwidth
External Load Capacitance
Output Current Range
Current Limit Inception
Peak Short-Circuit Current
RMS Short-Circuit Current
Dynamic Response
Load Change 50%-75%-50%, di/dt = 0.1 A/µs
di/dt = 1 A/µs
Settling Time to 1%
Efficiency
100% Load
50% Load
93
95
%
%
Co = 1 µF (ceramic)
Co = 15,000 µF (OSCON)
50
120
30
mV
mV
µs
Non-latching
Non-latching, Short = 10 mΩ
Non-latching
Over line, load and temperature
2
Full load, Co = 10 µF (tant.) + 1 µF (cer.)
Plus full load (resistive)
0
27.5
30
28
5
11.76
75
±4
±4
±10
±10
12.24
200
15,000
25
33.5
mV
mV
VDC
mV
PK-PK
µF
ADC
ADC
A
A
RMS
11.88
12.00
12.12
VDC
1
2
Additional Notes:
Vout can be increased up to 10% via the sense leads or up to 10% via the trim function. However, the total output voltage trim-up should
not exceed 10% of V
OUT
(
NOM
).
Operating ambient temperature range of -40 ºC to 85 ºC for converter.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00627_AA
HBC48T25120
Input and Output Impedance
These power converters have been designed to be stable with no external capacitors when used in low inductance input and
output circuits.
In many applications, the inductance associated with the distribution from the power source to the input of the converter can
affect the stability of the converter. The addition of a 100 µF electrolytic capacitor with an ESR < 1
Ω
across the input helps
to ensure stability of the converter. In many applications, the user has to use decoupling capacitance at the load. The power
converter will exhibit stable operation with external load capacitance up to 15,000 µF on the output.
Additionally, see the EMC section of this data sheet for discussion of other external components which may be required for
control of conducted emissions.
ON/OFF (Pin 2)
The ON/OFF pin is used to turn the power converter on or off remotely via a system signal. There are two remote control
options available, positive and negative logic, with both referenced to Vin(-). A typical connection is shown in Fig. A.
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
(Top View)
TRIM
SENSE (-)
Rload
VIN
CASE
VIN (-)
CONTROL
INPUT
VOUT (-)
Fig. A: Circuit configuration for ON/OFF function.
The positive logic version turns on when the ON/OFF pin is at a logic high and turns off when at a logic low. The converter is
on when the ON/OFF pin is left open. See the Electrical Specifications for logic high/low definitions.
The negative logic version turns on when the pin is at a logic low and turns off when the pin is at a logic high. The ON/OFF
pin can be hardwired directly to Vin(-) to enable automatic power up of the converter without the need of an external control
signal.
The ON/OFF pin is internally pulled up to 5 VDC through a resistor. A properly de-bounced mechanical switch, open-collector
transistor, or FET can be used to drive the input of the ON/OFF pin.
The device must be capable of sinking up to 0.2 mA at a low level voltage of
0.8 V. An external voltage source (±20 V
maximum) may be connected directly to the ON/OFF input, in which case it must be capable of sourcing or sinking up to 1
mA depending on the signal polarity. See the Startup Information section for system timing waveforms associated with use
of the ON/OFF pin.
Remote Sense (Pins 6 and 8)
The remote sense feature of the converter compensates for voltage drops occurring between the output pins of the converter
and the load. The SENSE(-) (Pin 6) and SENSE(+) (Pin 8) pins should be connected at the load or at the point where regulation
is required (see Fig. B).
VIN (+)
VOUT (+)
Rw
ON/OFF
SENSE (+)
(Top View)
TRIM
SENSE (-)
Rload
VIN
CASE
VIN (-)
VOUT (-)
Rw
Fig. B: Remote sense circuit configuration.
866.513.2839
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© 2015 Bel Power Solutions, Inc.
BCD.00627_AA
HBC48T25120
CAUTION
If remote sensing is not utilized, the SENSE(-) pin must be connected to the Vout(-) pin (Pin 5), and the SENSE(+) pin must be connected to
the Vout(+) pin (Pin 9) to ensure the converter will regulate at the specified output voltage. If these connections are not made, the converter
will deliver an output voltage that is slightly higher than the specified data sheet value.
Because the sense leads carry minimal current, large traces on the end-user board are not required. However, sense traces
should be run side by side and located close to a ground plane to minimize system noise and ensure optimum performance.
The converter’s output overvoltage protection (OVP) circuitry senses the voltage across Vout(+) and Vout(-), and not across
the +/- sense lines, so the resistance (and resulting voltage drop) between the output pins of the converter and the load
should be minimized to prevent unwanted triggering of the OVP.
When utilizing the remote sense feature, care must be taken not to exceed the maximum allowable output power capability
of the converter, which is equal to the product of the nominal output voltage and the allowable output current for the given
conditions.
When using remote sense, the output voltage at the converter can be increased by as much as 10% above the nominal rating
in order to maintain the required voltage across the load. Therefore, the designer must, if necessary, decrease the maximum
current (originally obtained from the derating curves) by the same percentage to ensure the converter’s actual output power
remains at or below the maximum allowable output power.
Output Voltage Adjust /TRIM (Pin 7)
The output voltage can be adjusted up 10% or down 20% relative to the rated output voltage by the addition of an externally
connected resistor. (Trim up to 10% at full load is guaranteed at Vin
≥
40V.)
The TRIM pin should be left open if trimming is not being used. To minimize noise pickup, a 0.1 µF capacitor is connected
internally between the TRIM and SENSE(-) pin.
To increase the output voltage, refer to Fig. C. A trim resistor, R
T-INCR
, should be connected between the TRIM (Pin 7) and
SENSE(+) (Pin 8), with a value of:
R
T
INCR
½
where,
V
O
NOM
(100
Δ)
(100
2
Δ)
1.225Δ
Δ
[kΩ]
R
T
INCR
½
Required value of trim-up resistor [kΩ]
V
O
NOM
½
Nominal value of output voltage [V]
(V
O -REQ
V
O -NOM
)
X 100
V
O -NOM
[%]
Δ
½
V
O
REQ
½
Desired (trimmed) output voltage [V].
When trimming up, care must be taken not to exceed the converter‘s maximum allowable output power. See the previous
section for a complete discussion of this requirement.
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
(Top View)
TRIM
SENSE (-)
Rload
VIN
CASE
R
T-INCR
VIN (-)
VOUT (-)
Fig. C: Configuration for increasing output voltage.
866.513.2839
tech.support@psbel.com
© 2015 Bel Power Solutions, Inc.
BCD.00627_AA
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