HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Features
•
RoHS lead-free solder and lead-solder-exempted
products are available
•
Delivers up to 25 A of output
(16 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 0.415”
(61.0 mm x 57.9 mm x 10.54 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
Applications
•
•
•
•
Telecommunications
Data communications
Wireless communications
Servers, workstations
Benefits
•
Cost-effective, single board design with optional
attached baseplate for cold plate cooling
applications and enhanced power capability
•
High efficiency – no heat sink required
Description
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.
.
REV. 1.2 JUN 12, 2007
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Page 1 of 16
HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Electrical Specifications
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
Notes
Continuous
Transient (100 msec)
Min
0
-40
-40
-40
-55
1500
1500
1500
Typ
Max
75
100
85
125
110
125
Units
VDC
VDC
°C
°C
°C
°C
VDC
VDC
VDC
2.5
10
360
Industry-std. equations
Percent of V
OUT
(
NOM
)
Latching
Non-latching
Component (Tc)
Baseplate (Tb)
117
122
140
125
Applies to all protection features
Time from UVLO to Vo=90%Vo-nom
Time from Enable to Vo=90%Vo-nom
-20
2.4
2.4
-20
200
50
4
0.8
20
20
0.8
-20
+10
+10
127
ηF
MΩ
kHz
%
%
% V
OUT
°C
°C
ms
ms
ms
VDC
VDC
VDC
VDC
Output Overvoltage Protection
Overtemperature Shutdown
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)
REV. 1.2 JUN 12, 2007
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Page 2 of 16
HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Electrical Specifications
(continued)
Conditions: T
A
= 25 ºC, Airflow = 300 LFM (1.5 m/s), Vin = 48 VDC, unless otherwise specified.
Parameter
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
Output Characteristics
Output Voltage Set Point (no load)
Output Regulation
Over Line
Over Load
Output Voltage Range
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
Additional Notes:
.
1
Notes
Min
36
Typ
48
34
32
Max
75
35
33
100
10
Units
VDC
VDC
VDC
VDC
ADC
mADC
mADC
mA
PK-PK
dB
Non-latching
33
31
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
11.88
3
75
20
65
12.00
±4
±4
Over line, load and temperature
Plus full load (resistive)
0
Non-latching
Non-latching, Short = 10 mΩ
Non-latching
Co = 1 µF (ceramic)
Co = 15,000 µF (OSCON)
27.5
30
28
5
50
120
30
93
95
2
12.12
±10
±10
12.24
200
15,000
25
33.5
VDC
mV
mV
VDC
mV
PK-PK
µF
ADC
ADC
A
A
RMS
mV
mV
µs
%
%
11.76
75
Output Ripple and Noise – 25 MHz bandwidth Full load, Co = 10 µF (tant.) + 1 µF (cer.)
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.
2
REV. 1.2 JUN 12, 2007
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Page 3 of 16
HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
Operations
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.
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 (-)
Rw
Rload
VIN
CASE
VIN (-)
VOUT (-)
Fig. B: Remote sense circuit configuration.
VIN (+)
VOUT (+)
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.
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.
REV. 1.2 JUN 12, 2007
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.
Page 4 of 16
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HBC48T25120 DC-DC Converter Data Sheet
36-75 VDC Input; 12 VDC @ 25 A Output
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
=
V
O
−
NOM
(100
+
Δ)
(100
+
2
Δ)
, kΩ
−
1.225Δ
Δ
To decrease the output voltage (Fig. D), a trim
resistor, R
T-DECR
, should be connected between the
TRIM (Pin 7) and SENSE(-) (Pin 6), with a value of:
R
T
−
DECR
=
100
−
2
, kΩ
|
Δ
|
where,
R
T
−DECR
=
Required value of trim-down resistor [kΩ]
and
Δ
is defined above.
Note:
The above equations for calculation of trim resistor values match
those typically used in conventional industry-standard half-bricks.
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
(Top View)
TRIM
SENSE (-)
R
T-DECR
Rload
VIN
CASE
VIN (-)
VOUT (-)
Fig. D: Configuration for decreasing output voltage
.
where,
R
T
−INCR
=
Required value of trim-up resistor [kΩ]
V
O
−NOM
=
Nominal value of output voltage [V]
Δ
=
(V
O -REQ
−
V
O -NOM
)
×
100
, %
V
O -NOM
V
O
−REQ
=
Desired (trimmed) output voltage [V].
Trimming/sensing beyond 110% of the rated output
voltage is not an acceptable design practice, as this
condition could cause unwanted triggering of the
output overvoltage protection (OVP) circuit. The
designer should ensure that the difference between
the voltages across the converter’s output pins and
its sense pins does not exceed 110% of V
OUT
(
NOM
),
or:
[V
OUT
(
+
)
−
V
OUT
(
−
)]
−
[V
SENSE
+
)
−
V
SENSE
−
)]
≤
V
O - NOM X
10%
(
(
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.
This equation is applicable for any condition of
output sensing and/or output trim.
VIN (+)
VOUT (+)
ON/OFF
SENSE (+)
(Top View)
TRIM
SENSE (-)
R
T-INCR
Rload
VIN
CASE
VIN (-)
VOUT (-)
Fig. C: Configuration for increasing output voltage.
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