HBCS DC-DC Series Preliminary Data Sheet
48VDC Input; 12VDC @ 25A Output
Features
•
Integrated four-channel sequencer with
intermediate bus voltage monitor
•
Four enable outputs to control point-of-load
regulators
•
Enable signal delays are user-programmable from
1 to 50ms
•
Fully-regulated 12V output
•
Output voltage is adjustable from 9.6V to 13.2V
•
High output power of 300W
•
Efficiency up to 94%
•
Wide-input voltage range from 36V to 75V
•
100V/100ms input voltage surge
•
Input-to-output isolation: 1500VDC
•
Basic insulation
•
Backdrive protection
•
Start-up into prebiased load
•
Output overcurrent protection
•
Output overvoltage protection
•
Overtemperature protection
•
Remote sense
•
Remote on/off (primary referenced), positive or
negative logic option
•
Designed to comply with NEBS GR-1089 and
GR-63
•
UL1950 recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Applications
•
Power systems utilizing Intermediate Bus
Architecture
•
Networking equipment
•
Data/voice processing
•
Wireless communications
•
Computing
Benefits
•
Simplifies power system design; reduces design
time and technical risk
•
Reduces PCB area occupied by power conversion
and power management components
•
Compatible with all POLs available in the market
Description
The HBCS25ZH is the industry's first high density isolated DC-DC converter that features integration of power
conversion with power management functions. In addition to 300W of tightly-regulated 12V output, the converter
offers an integrated four-channel sequencer, an intermediate bus voltage monitor and four enable outputs to
control point-of-load regulators that it powers. The HBCS25ZH converter is an ideal choice for building a complete
power system utilizing Intermediate Bus Architecture (IBA).
The unit's open-frame, two-board construction provides ideal thermal transfer for maximum reliability. Power
devices are mounted on an Insulated Metal Substrate (IMS) base plate with very low thermal impedance. The
control PCB is physically isolated from the hotter IMS board, providing lower overall component temperatures for
high reliability.
Model Selection
Model
Input
Voltage
VDC
36-75
Input Current
Imax, ADC
10
Output
Voltage
Vout, VDC
12.0
Output Rated
Current
Irated, ADC
25
Output
Ripple and Noise,
mV p-p BW=20MHz
150
Efficiency
@Irated%
91.5
HBCS25ZH
REV. JAN 17, 2005
Page 1 of 11
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HBCS DC-DC Series Preliminary Data Sheet
48VDC Input; 12VDC @ 25A Output
Absolute Maximum Ratings
Stresses in excess of the absolute maximum ratings may cause performance degradation, adversely effect long-
term reliability, and cause permanent damage to the converter.
Parameter
Input voltage
Operating Temperature
Storage Temperature
ON/OFF Control Voltage
Referenced to -Vin
Conditions/Description
Continuous
Transient, 100ms
Base Plate Temperature
-40
-55
Min
Max
75
100
110
125
7
Units
VDC
VDC
°C
°C
VDC
Environmental and Mechanical Specifications
Parameter
Shock
Sinusoidal Vibration
Operating Humidity
Storage Humidity
Water Washing
Weight
MTBF
Per Bellcore TR-NWT-000332
Standard process
Yes
2.6(73)
1,100
Oz(g)
kHrs
Conditions/Description
Halfsine wave, 3 axes
GR-63-CORE, Section 5.4.2
Min
50
1
95
95
Nom
Max
Units
g
g
%
%
Isolation Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Insulation Safety Rating
Isolation Voltage
Isolation Voltage
Isolation Voltage
Isolation Resistance
Isolation Capacitance
Input to output
Input to baseplate
Output to baseplate
Input to output
Input to output
1500
1500
1500
10
1000
Conditions/Description
Min
Nom
Basic
VDC
VDC
VDC
MOhm
pF
Max
Units
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Input Voltage
Maximum Input Current
Turn-On Input Voltage (UVLO)
Turn-Off Input Voltage
Input Reflected Ripple Current
BW=20MHz
Inrush Transient
Conditions/Description
Continuous
Vin =36V, Iout=I
rated
Ramping Up
Ramping Down
I
rated
, 12µH source inductance
Vin=Vin.max
33
31
34.5
32
30
Min
36
Nom
48
Max
75
10
36
33
75
0.25
Units
VDC
ADC
VDC
VDC
mA p-p
As
2
REV. JAN 17, 2005
Page 2 of 11
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HBCS DC-DC Series Preliminary Data Sheet
48VDC Input; 12VDC @ 25A Output
Output Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Voltage Setpoint Accuracy
Output Current
Efficiency
Switching Frequency
Ripple and Noise, DC to 20MHz (see
Fig. 6 for test setup)
Line Regulation
Load Regulation
Total static output voltage regulation
Turn-On Time for turn-on via
application of input voltage
Turn-On Time for turn-on via ON/OFF
signal
Rise Time
Turn-on Overshoot
Dynamic Regulation
Peak Deviation
Settling Time
Admissible Load Capacitance
Over line and load
Tamb= 0°C to 85°C
Vin.min to Vin.max, I
rated
Vin = Vin.nom,
10% to 100% I
rated
Over all line, load, and
temperature conditions
Time from Vin=UVLO to
regulation band
Time from ON/OFF signal to
regulation band
from 10 to 90% of Vout.nom
Over all input voltage, load, and
temperature conditions
75-100-75% load step change,
di/dt=1A/µs
to 1% error band
11.64
60
10
10
2
0.2
0.4
12.36
85
25
25
5
%Vout
%Vout
VDC
ms
ms
ms
%Vout
Conditions/Description
Vin = Vin.nom, Iout=I
rated
I
rated
Tamb=25°C, Vin = Vin.nom,
Iout=I
rated
Min
11.76
0
91.5
500
150
240
Nom
12.00
Max
12.24
25
Units
VDC
ADC
%
kHz
mV p-p
3
0.5
5
1.0
15,000
%Vout
ms
µF
Protection Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Type
Threshold
Overvoltage Protection
Type
Threshold
Type
Threshold
Hysteresis
Latching, recycle input voltage or ON/OFF signal to unlatch
Vin = Vin.nom, Iout=I
rated
Overtemperature Protection
Non-latching, auto-recovery
Baseplate temperature
120
125
10
130
°C
°C
115
125
%Vout
Conditions/Description
Overcurrent Protection
Non-latching, auto-recovery
28
38
ADC
Min
Nom
Max
Units
REV. JAN 17, 2005
Page 3 of 11
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HBCS DC-DC Series Preliminary Data Sheet
48VDC Input; 12VDC @ 25A Output
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Negative Logic (-N)
Converter ON
Source Current
Converter OFF
Open Circuit Voltage
Positive Logic
Converter ON
Open Circuit Voltage
Converter OFF
Source Current
Remote Sense Headroom
Trim Up
Trim Down
Enable Outputs (pins16-19)
Open collector voltage
Sink Current
Enable signal is low
Enable signal is high
Delay Outputs (pins12-15)
Source current
Open circuit voltage
Minimum delay
Maximum delay
Delay programming accuracy
Output Voltage Monitoring
Sequencing outputs enabled
Sequencing outputs disabled
Vout ramping up
Vout ramping down
86
78
88
80
90
82
%Vout
%Vout
Delay output is shorted to -Vout
Delay output is floating
Rdelay=1kOhm to 1MOhm
0.2
33.9
-28
TBD
TBD
1.1
46.6
2.0
59.3
+28
mADC
VDC
ms
ms
%
POLs are disabled
POLs are enabled
TBD
TBD
1
Conditions/Description
ON/OFF
ON/OFF signal is low or the pin is
connected to -Vin – converter is ON
Von/off in reference to -Vin
ON/OFF pin is connected to -Vin
Von/off in reference to -Vin
ON/OFF pin is floating
On/Off signal is low or the pin is floating
–converter is OFF
Von/off in reference to -Vin
ON/OFF pin is floating
Von/off in reference to -Vin
ON/OFF pin is connected to -Vin
Remote Sense
Min
Nom
Max
Units
-0.5
2.5
0.8
0.5
7
5
VDC
mADC
VDC
VDC
2.5
-0.5
7
5
0.8
0.5
10
VDC
VDC
VDC
mADC
%Vout
%Vout
%Vout
Output Voltage Trim
Vin = Vin.nom, Iout=I
rated
Vin = Vin.nom, Iout=I
rated
Sequencing
Open collector
15
2
VDC
mADC
VDC
VDC
10
-20%
1
The output voltage of the converter shall not be increased by more than 1.2V by either remote sense or trim adjustment or a combination of
both.
REV. JAN 17, 2005
Page 4 of 11
www.power-one.com
HBCS DC-DC Series Preliminary Data Sheet
48VDC Input; 12VDC @ 25A Output
PERFORMANCE CHARACTERISTICS
Efficiency
95
90
Efficiency, %
85
80
75V
75
0
5
10
15
20
25
Output Current, A
48V
36V
Figure 3. HBCS25ZH-NT Turn-On Process.
Channel 1 –ON/OFF pin voltage, Channel 2 – output voltage.
Figure 1. HBCS25ZH Efficiency vs. Output Current
If the converter is controlled by the ON/OFF signal,
there is no turn-on delay. The output voltage starts
rising immedialtely after the converter is enabled by
the ON/OFF signal.
Dynamic Load Response
Turn-On Process
Figure 2. HBCS25ZH Turn–On Process.
Channel 1 – input voltage,
Channel 2 – output voltage
Figure 4. HBCS25ZH-Dynamic Regulation
The load is switched from 12.5A to 18.75 at di/dt=1A/µs. .
Cext=0uF. Channel 1 - output voltage, Channel 2 – output current.
When the input voltage reaches the turn-on threshold
of the input undervoltage protection circuit (indicated
by the left vertical bar), it triggers an internal timer.
The timer generates a delay of approximately 50ms.
The output voltage starts rising upon completion of
the delay, as indicated by the right vertical bar. The
delay allows the input voltage to stabilize before the
converter turns on, thus preventing the input voltage
sag and nuisance tripping of the UVLO protection of
the converter.
REV. JAN 17, 2005
Page 5 of 11
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