HBA48T12280 DC-DC Converter Data Sheet
36-75 VDC Input; 28 VDC @ 12.5 A Output
Features
Applications
Cellular Infrastructure
Wireless communications
Telecommunications
RoHS compliant for all six substances
Delivers up to 12.5 A of output current
Industry-standard half-brick pinout
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
Remote output voltage sense
Positive or negative logic ON/OFF option
Output voltage trim range: +18%/−25%
Protections include: undervoltage lockout,
overcurrent, overvoltage, and overtemperature
CAN/CSA C22.2, No. 60950-1/UL 60950-1 Second
Edition, IEC/EN 60950-1 Second Edition safety
approved
Description
The HBA48T12280 DC-DC Converter operates over an input voltage range of 36 to 75 VDC and provides a
regulated output voltage of 28.0 VDC at up to 12.5 A of output current. The HBA48T12280 provides a regulated
28V bus voltage for today’s RF power amplifiers. Its design emphasis is on obtaining the best cost/performance
tradeoff. The converter's output is fully isolated from the input, which allows a positive or negative output
configuration and the converter to meet Basic Insulation requirements.
The open-frame converter module is constructed with a dual-board approach using discrete magnetics. The
standard feature set includes remote on/off (positive or negative logic), output voltage sensing, positive logic
output trim, input undervoltage lockout, output voltage shutdown, output overcurrent shutdown, and
overtemperature shutdown with hysteresis.
.
BCD.00009.1 Rev. AC, 01-Jun-10
Page 1 of 14
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HBA48T12280 DC-DC Converter Data Sheet
36-75 VDC Input; 28 VDC @ 12.5 A Output
Electrical Specifications
Conditions: min. < T
OPERATING
< max., min. < V
IN
< max, load = resistive, unless otherwise specified.
Parameter
Absolute Maximum Ratings
Input Voltage
Operating Ambient Temperature
Operating Temperature
Component (Tc)
Baseplate (Tb)
Storage Temperature
Isolation Characteristics
Input to Base plate Isolation
Input to Output Isolation
Output to Base plate Isolation
Isolation Capacitance
Isolation Resistance
Feature Characteristics
Switching Frequency
Output Voltage Trim Range
1
1
Notes
Continuous
Transient (100 ms)
Operation limited by Baseplate
temperature
Min
0
-40
-40
-40
-55
1500
1500
500
Typ
Max
80
100
85
125
100
125
Units
VDC
VDC
°C
°C
°C
°C
VDC
VDC
VDC
Input to output
10
1.6
2.0
ηF
MΩ
325
Industry-std. equations
Percent of V
OUT
(
NOM
)
2
kHz
+18
140
%
%
%
°C
°C
ms
ms
VDC
mADC
VDC
-25
5
120
105
10
125
110
Remote Sense Compensation
Output Overvoltage Protection
Latching
Overtemperature Shutdown
Component (Tc)
Baseplate (Tb) Non-latching
Hysteresis
Turn-On Time from Vin
Turn-On Time from enable
ON/OFF Control (Positive Logic option)
Off threshold level
Converter Off (logic low)
Converter On (logic high)
1
Time from UVLO to Vo=90%Vo-nom
Time from Enable to Vo=90%Vo-nom
-0.3
2.4
80
80
0.8
1
35.0
Source Current On/Off to -Vin
On threshold level
Vout can be increased up to 5% via the sense leads or up to 18% via the trim function. However, the total output voltage trim-up should not
exceed 18% of V
OUT
(
NOM
).
Trim equations are defined within this document’s “Operations” section.
2
BCD.00009.1 Rev. AC, 01-Jun-10
Page 2 of 14
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HBA48T12280 DC-DC Converter Data Sheet
36-75 VDC Input; 28 VDC @ 12.5 A Output
Electrical Specifications (continued)
Conditions: min. < T
OPERATING
< max., min. < V
IN
< max, load = resistive, Cin=33 µF, unless otherwise specified.
Parameter
Input Characteristics
Operating Input Voltage Range
Input Under Voltage Lockout (UVLO)
Turn-on Threshold
Turn-off Threshold
Hysteresis
Maximum Input Current
Input Stand-by Current
28 VDC Out @ 12.5 ADC, Vin= 36 VDC
Vin = nom., converter disabled
Non-latching
34
32
1.5
35
33
2.0
12
30
50
28
7
35.99
34.0
VDC
VDC
VDC
ADC
mADC
mADC
mA
PK-PK
36
48
75
VDC
Notes
Min
Typ
Max
Units
Input No Load Current (No-load on the output) Vin = nom., converter enabled
Input Reflected-Ripple Current,
i
c
Input-Ripple Current,
i
s
Input Voltage Ripple Rejection
120 Hz
60
25 MHz bandwidth, see Figure T,
Vin=48V, Po=350W
mA
RMS
3600 mA
PK-PK
2600
mA
RMS
dB
Output Specifications
Conditions: min. < T
OPERATING
< max., min. < V
IN
< max., load = resistive, Cin=33 µF, unless otherwise specified.
Parameter
Output Characteristics
Output Voltage Set Point
Output Regulation
Over Line
Over Load
[min. < V
IN
< max.]
[min. < Io < max.]
T
A
T
A
≈
room, V
IN
= nom., Load = max.
27.72
28.00
±24
±24
-2.5
Over rated line, load, and temperature
27.30
220
5
0
104
Current Limit Inception
Short-Circuit Current
Dynamic Response
Load Change 50%-75%-50%, di/dt = 0.1 A/µs Co = 1 µF (cer.)+ 220 µF (Al Electrolytic)
di/dt = 1.0 A/µs Co = 4700 µF (Al Electrolytic)
Settling Time to 10%
Efficiency
@ 100% Load
@ 50% Load
(Full parametric curves located within
EVT/DVT reports)
500
500
600
91
90
mV
mV
µs
%
%
Non-latching
P
K
:
RMS: Non-latching, Short = 10 mΩ
13
65
13
28.28
±56
±56
2.5
28.70
280
5000
180
12.5
VDC
mV
mV
%/C
VDC
mV
PK-PK
µF
mΩ
ADC
%
ADC
Amps
A
RMS
Notes
Min
Typ
Max
Units
≈
room, Load = max.
T
A
≈
room, V
IN
= nom.
Output Temperature Regulation
Output Voltage Range (combined reg.)
Output Ripple and Noise – 25 MHz bandwidth Co = 1 µF (cer.)+ 220 µF (electrolytic)
Admissible Ext. Load Capacitance
C
EXT
:
Load = max. (resistive)
ESR:
Output Current Range
BCD.00009.1 Rev. AC, 01-Jun-10
Page 3 of 14
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HBA48T12280 DC-DC Converter Data Sheet
36-75 VDC Input; 28 VDC @ 12.5 A Output
Non-Electrical Specifications
Parameter
Environmental Characteristics
Operating Humidity
Storage Humidity
Vibration (Sinusoidal)
Shock
Physical Characteristics
Dimensions
Weight
Markings & labeling
Reliability
Calculated MTBF
EMI & Regulatory Agency Compliance
Safety
Insulation
Flammability
EMC-General Requirements
EMC-Emission and Immunity
Notes
RH (non-condensing)
RH (non-condensing)
GR-63-CORE, Sect. 5.4.2
Half Sinewave, 3-axis
Refer to mechanical drawing.
Refer to mechanical drawing platform notes.
Includes: Part Number, Power-One Logo, Date Code and Country of Manufacture
Per Telcordia SR-332, Method1
Case 1
1
50
Min
Typ
Max
95
95
Units
%
%
g
g
13.2
MHrs
CAN/CSA C22.2, No. 60950-1 * UL 60950-1 Second Edition, IEC/EN
60950-1 Second Edition
Basic Insulation input to output/baseplate
94 V-0
ETSI EN 300 132-2 V2.1.1 (11/2002)
ETSI EN 300 386 V1.3.1 (09/2001)
BCD.00009.1 Rev. AC, 01-Jun-10
Page 4 of 14
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HBA48T12280 DC-DC Converter Data Sheet
36-75 VDC Input; 28 VDC @ 12.5 A Output
Operations
Input and Output Impedance
These power converters have been designed to be
stable with a minimum external output capacitor of
220 µF when used in low inductance input and
output circuits. When the ambient temperature is
lower than -20 ºC, use 3 x 220 µF capacitors rated at
50V to reduce ESR. Use Nichicon UPW1H221MPD
or equivalent.
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.
It is recommended that a 33 µF capacitor with a
voltage rating of 100 VDC and an ESR <0.1
Ω
be
used across the input of the HBA48T12280 to
ensure stability of the converter. At temperatures
< -20 ºC, use 2 X 33 µF capacitors to reduce the
effective ESR of the input capacitance.
In applications where decoupling capacitance is
distributed at the load, the power converter will
exhibit stable operation with up to the maximum
admissible external load capacitance (C
EXT
)
connected.
(Refer to “Output Specifications” table for value of
C
EXT
)
Remote Sense
The remote sense feature of the converter
compensates for voltage drops occurring between
the output pins of the converter and the load. The
SENSE(–) and SENSE(+) pins should be connected
at the load or at the point where regulation is
required (see Figure A).
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 5% 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.
ON/OFF Control
Models designated Negative Logic Enable turn the
converter off during a logic –high or open-circuit and
on during a logic-low or a short from the on/off pin to
–Vin.
Models designated Positive Logic Enable turn the
converter off during a logic-low or a short from on/off
pin to –Vin and on during a logic-high or open circuit.
VIN (+)
VOUT (+)
Rw
ON/OFF
SENSE (+)
(Top View)
TRIM
SENSE (-)
Rw
Rload
VIN
CASE
VIN (-)
VOUT (-)
Figure A: Remote sense circuit configuration.
Caution:
If remote sensing is not utilized, the SENSE(–) pin must be
connected to the Vout(–) pin, and the SENSE(+) pin must be
connected to the Vout(+) pin 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.
BCD.00009.1 Rev. AC, 01-Jun-10
Page 5 of 14
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