HHD25 DC-DC Series Data Sheet
20/25A Half-Brick
Features
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Applications
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Distributed power architectures
Telecommunications equipment
LAN/WAN applications
Data processing applications
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Description
The HHD25 is a series of high density
Half-brick
size,
High
current,
Dual
output dc-dc converters with through-hole
mounting. The products provide onboard conversion of standard telecom and datacom input voltages to two
independently-regulated output voltages. Leading-edge technology provides extremely high efficiency and
superior thermal performance which enables the products to deliver full-rated power at 55 °C ambient temperature
with only 200 LFM forced air without the addition of a heatsink. The outputs also track each other during both
startup and shutdown.
RoHS lead solder exemption compliant
100/85 Watt total output power
Independently-regulated outputs
Flexible load distribution
Open-frame design with Insulated Metal
Substrate
Low profile – 12.7mm height
High efficiency - 87%
Output voltage tracking
Output overcurrent protection
Output overvoltage protection
Overtemperature protection
Setpoint accuracy
±1.5%
Independent output voltage trim, positive or
negative
Input/output isolation: 1500 VDC
Basic insulation
UL 1950 Recognition, CSA 22.2 No. 950-95
certification, TUV IEC950
Model Selection
Model
Input
Voltage
Range, VDC
36-72
36-72
36-72
36-72
18-36
Input
Current,
Max, ADC
3.6
3.6
3.1
3.1
7.2
Output
Voltage,
VDC
5.0/3.3
5.0/1.8
3.3/2.5
3.3/1.8
5.0/3.3
Output Rated
Current, ADC
20/20
20/20
25/20
25/20
20/20
Output Ripple
and Noise, mV
p-p
100
100
100
100
100
Typical
Efficiency
%
87
85
85
84
85
HHD20ZGE
HHD20ZGB
HHD25ZED
HHD25ZEB
HHD20YGE
Model numbers highlighted in yellow or shaded are not recommended for new designs.
REV. FEB 27, 2006
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HHD25 DC-DC Series Data Sheet
20/25A Half-Brick
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
At 100% load
Min
36
-40
-40
Max
75
100
100
125
50
Units
VDC
VDC
°C
°C
VDC
Environmental and Mechanical Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Vibration
Weight
Water Washing
MTBF
Standard Process
Per Bellcore TR-NWT-000332
Conditions/Description
Halfsine wave, 10-55 Hz, 3 axes,
5 min each
2.3/68
Yes
1,780
kHrs
Min
Nom
Max
5
Units
g
Oz/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 Resistance
Isolation Capacitance
1500
10
3000
Conditions/Description
Min
Nom
Basic
VDC
MΩ
pF
Max
Units
Input Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Input Voltage
Turn-On Input Voltage
Turn-Off Input Voltage
Turn-On Time
Conditions/Description
Continuous
Ramping Up
Ramping Down
To Output Regulation Band
100% Resistive Load
Input Reflected Ripple Current
Input Inrush Current Limit
Full Load, 12µH source inductance
Vin=Vin.max
1
80
mA p-p
A
2
s
Min
36
Nom
48
33
30
10
Max
75
Units
VDC
VDC
VDC
ms
REV. FEB 27, 2006
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HHD25 DC-DC Series Data Sheet
20/25A Half-Brick
Output Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Output Voltage Setpoint Accuracy
Output Current* Vout1
Output Current* Vout2
Line Regulation Vout1
Line Regulation Vout2
Load Regulation,Vout1,Vout2
Remote Sense Headroom
Dynamic Regulation
Peak Deviation
Settling Time
Admissible Load Capacitance
Output Current Limit Threshold**
Switching Frequency
Overvoltage Protection,
Non Latching
Trim Range
Over all input voltage and load
conditions
Iout.max, Vin=Vnom
120
to 1% error band
Iout.max, Nom Vin
Vout≤0.97Vout.nom
30,000
115
270
140
140
50-75% load step change
4
500
%Vout
μs
μF
%Iout
kHz
%Vout
Conditions/Description
Vin=Vin.nom, Full Load
For MAX see Table
For MAX see Table
Vin.min to Vin.max, Iout.max
Vin.min to Vin.max, Iout.max
Vin=Vnom, Iout.min to Iout.max
Min
-1.5
2.0
2.0
0.2
1
1
0.5
Nom
Max
1.5
Units
%Vout
ADC
ADC
%Vout
%Vout
%Vout
VDC
90
110
%Vout
* At Iout<Iout.min, the output may contain low frequency component that exceeds ripple specifications.
** Overcurrent protection is non-latching with auto recovery.
Feature Specifications
All specifications apply over specified input voltage, output load, and temperature range, unless otherwise noted.
Parameter
Shutdown (ON/OFF)
Negative Logic
Converter ON
Source Current
Converter OFF
Open Circuit Voltage
Positive Logic
Converter ON
Open Circuit Voltage
Converter OFF
Source Current
Overtemperature Protection
Conditions/Description
On/Off signal is low – converter is ON
-1.0
ON/OFF pin is connected to -Vin
3.5
ON/OFF pin is floating
On/Off signal is low –converter is OFF
3.5
ON/OFF pin is floating
-1.0
ON/OFF pin is connected to -Vin
Case Temperature
105
110
2.5
1.8
1.0
115
2.5
15
1.8
1.0
15
VDC
mADC
VDC
VDC
VDC
VDC
VDC
mADC
°C
Min
Nom
Max
Units
REV. FEB 27, 2006
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HHD25 DC-DC Series Data Sheet
20/25A Half-Brick
Characteristic Curves
90
85
80
75
70
65
60
55
50
45
40
10
20
30
40
50
60
70
LOAD %
Figure 1. HHD20ZGE Efficiency vs. Output Load
EFF.(36V)
EFF.(48V)
EFF.(75V)
80
90 100
90
85
80
75
70
65
60
55
50
45
40
10
20
30
40
50 60
LOAD %
70
80
90 100
EFFICIENCY %
EFFICIENCY %
100
Figure 4. HHD25ZEB Efficiency vs. Output Load
90
85
80
75
70
65
60
55
50
45
40
10
20
30
40
50 60
LOAD %
70
80
90 100
EFFICIENCY %
EFFICIENCY %
Figure 2. HHD20ZED Efficiency vs. Output Load
90
85
80
75
70
65
60
55
50
45
40
10
20
30
40 50 60
LOAD %
70
80
90
Figure 3. HHD20ZGB Efficiency vs. Output Load
REV. FEB 27, 2006
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HHD25 DC-DC Series Data Sheet
20/25A Half-Brick
Typical Application
Figure 5 shows recommended connections for the
HHD Series converter.
When the ON/OFF pin is used to achieve remote
control, the user must take care to insure that the pin
reference for the control is really the -Vin pin. The
control signal must not be referenced ahead of EMI
filtering, or remotely from the unit. Optically coupling
the information and locating the optical coupler
directly at the module will solve any of these
problems.
Note:
If the ON/OFF pin is not used, it can be left floating (positive logic),
or connected to the -Vin pin (negative logic).
Output Voltage Trim
The trim feature allows the user to adjust the output
voltage from the nominal. This can be used to
accommodate a different requirement or to do
production margin testing.
The general equation for changing the output voltage
on the standard trim modules is invariant, but the
internal values are different for different output
voltages, so the constants in the equation change.
Figure 5. Typical Application of HHD Series
The HHD Series converters do not require any
external components for proper operation. However,
if the distribution of the input voltage to the converter
contains significant inductance, the capacitor C1
may be required to enhance performance of the
converter. A minimum of a 47
μF
electrolytic
capacitor with the ESR<0.7Ω is recommended for
the HHD Series.
If the magnitude of the inrush current needs to be
limited, see the “Inrush Current Control Application
Note” on www.power-one.com.
For output decoupling, we recommend using a 10
μF
tantalum and a 1
μF
ceramic capacitor connected
directly across the output pins of the converter. Note
that the capacitors do not substitute the filtering
required by the load.
Shutdown Feature Description
The ON/OFF pin in the HHD Series converters
functions as a normal soft shutdown. It is referenced
to the –Vin pin (see Figure 5). With the standard
positive logic, when the ON/OFF pin is pulled low,
the output is turned off and the unit goes into a very
low input power mode.
With optional negative logic, when the ON/OFF pin is
pulled low, the unit is turned on.
An open collector switch is recommended to control
the voltage between the ON/OFF pin and the -Vin
pin of the converter. The ON/OFF pin is pulled up
internally, so no external voltage source is required.
The user should avoid connecting a resistor between
the ON/OFF pin and the +Vin pin.
REV. FEB 27, 2006
R
TRIM
=
A
−
B
× Δ
V
,
kΩ
Δ
V
where A and B are constants from the table below,
and
ΔV
is the absolute value of the desired change
in the output voltage in Volts.
Table 1. Output 1 Trim Formula Parameter.
Model
HHD20ZGE
HHD20ZGB
HHD25ZED
HHD25ZEB
Trim up
A
B
2.5
3.32
2.5
3.32
2.047 5.11
2.047 5.11
Trim down
A
B
2.5
4.32
2.5
4.32
3.431
6.77
3.431
6.77
Table 2. Trim Formula Parameter.
Model
HHD20ZGE
HHD20ZGB
HHD25ZED
HHD25ZEB
Trim up
A
B
0.80 0.365
2.50
2.74
6.176 10.0
2.50
2.74
Trim down
A
B
0.256 0.685
1.10
4.74
6.149 14.93
1.10
4.74
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