Data Sheet
June 29, 2009
EHW007A0B Series (Eighth-Brick) DC-DC Converter Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Features
Compliant to RoHS EU Directive 2002/95/EC (-Z
versions)
Compliant to ROHS EU Directive 2002/95/EC with
lead solder exemption (non-Z versions)
High efficiency 92.5% at 12.0V full load
(Vin=48Vdc)
Industry standard, DOSA compliant footprint
58.4mm x 22.8mm x 8.1mm
(2.30 in x 0.9 in x 0.32 in)
Low profile height and reduced component skyline
Wide input voltage range: 36-75 Vdc
Tightly regulated output
Constant switching frequency
Positive remote On/Off logic
Input under/over voltage protection
Output overcurrent and overvoltage protection
Over-temperature protection
Remote sense
No reverse current during output shutdown
Output Voltage adjust: 90% to 110% of V
o,nom
RoHS Compliant
Applications
Distributed Power Architectures
Wireless Networks
Access and Optical Network Equipment
Enterprise Networks including Power over Ethernet
(PoE)
Options
Negative Remote On/Off logic
Over current/Over temperature/Over voltage
protections (Auto-restart)
Heat plate version (-H)
Surface Mount version (-S)
Wide operating temperature range (-40°C to 85°C)
Suitable for cold wall cooling using suitable Gap
Pad applied directly to top side of module
UL*Recognized to UL60950-1, CAN/CSA
†
C22.2
No.60950-1,
and EN60950-1(
VDE
‡
0805-1)
Licensed
CE mark meets 2006/95/EC directive
§
Meets the voltage and current requirements for
ETSI 300-132-2 and complies with and licensed
for Basic insulation rating per EN60950-1
2250 Vdc Isolation tested in compliance with IEEE
¤
802.3 PoE standards
ISO
**
9001 and ISO 14001 certified manufacturing
facilities
Description
The EHW007A0B, Eighth-brick low-height power module is an isolated dc-dc converters that can deliver up to 7A of
output current and provide a precisely regulated output voltage of 12.0V over a wide range of input voltages (V
IN
= 36
- 75Vdc). The modules achieve typical full load efficiency of 92.5%. The open frame modules construction, available
in both surface-mount and through-hole packaging, enable designers to develop cost and space efficient solutions.
Standard features include remote On/Off, remote sense, output voltage adjustment, overvoltage, overcurrent and
overtemperature protection.
*
UL
is a registered trademark of Underwriters Laboratories, Inc.
†
CSA
is a registered trademark of Canadian Standards Association.
‡
VDE
is a trademark of Verband Deutscher Elektrotechniker e.V.
§
This product is intended for integration into end-user equipment . All of the required procedures of end-use equipment should be followed.
¤ IEEE and 802 are registered trademarks of the Institute of Electrical and Electronics Engineers, Incorporated.
** ISO is a registered trademark of the International Organization of Standards
Document No: DS08-002 ver. 1.01
PDF name: ehw007_ds.pdf
Data Sheet
June 29, 2009
Absolute Maximum Ratings
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Stresses in excess of the absolute maximum ratings can cause permanent damage to the device. These are absolute
stress ratings only, functional operation of the device is not implied at these or any other conditions in excess of those
given in the operations sections of the data sheet. Exposure to absolute maximum ratings for extended periods can
adversely affect the device reliability.
Parameter
Input Voltage
Continuous
Transient, operational (≤100 ms)
Operating Ambient Temperature
(see Thermal Considerations section)
Storage Temperature
I/O Isolation voltage (100% factory Hi-Pot tested)
All
All
T
stg
-55
125
2250
°C
V
dc
All
All
All
V
IN
V
IN,trans
T
A
-0.3
-0.3
-40
80
100
85
V
dc
V
dc
°C
Device
Symbol
Min
Max
Unit
⎯
⎯
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter
Operating Input Voltage
Maximum Input Current
(V
IN
= V
IN, min
to V
IN, max
, I
O
=I
O, max
)
Input No Load Current
(V
IN
= V
IN, nom
, I
O
= 0, module enabled)
Input Stand-by Current
(V
IN
= V
IN, nom
, module disabled)
Inrush Transient
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; V
IN, min
to V
IN, max,
I
O
= I
Omax
; See Test configuration section)
Input Ripple Rejection (120Hz)
All
Device
All
All
All
All
Symbol
V
IN
I
IN,max
I
IN,No load
I
IN,stand-by
It
2
Min
36
Typ
48
2.75
70
5
Max
75
3.0
Unit
V
dc
A
dc
mA
8
0.5
mA
As
2
All
30
mA
p-p
All
50
dB
CAUTION: This power module is not internally fused. An input line fuse must always be used.
This power module can be used in a wide variety of applications, ranging from simple standalone operation to an
integrated part of sophisticated power architectures. To preserve maximum flexibility, internal fusing is not included,
however, to achieve maximum safety and system protection, always use an input line fuse. The safety agencies
require a fast-acting fuse with a maximum rating of 6 A (see Safety Considerations section). Based on the information
provided in this data sheet on inrush energy and maximum dc input current, the same type of fuse with a lower rating
can be used. Refer to the fuse manufacturer’s data sheet for further information.
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Data Sheet
June 29, 2009
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Electrical Specifications
(continued)
Parameter
Nominal Output Voltage Set-point
V
IN
=V
IN, min
, I
O
=I
O, max
, T
A
=25°C)
Output Voltage
(Over all operating input voltage, resistive load, and
temperature conditions until end of life)
Output Regulation
Line (V
IN
=V
IN, min
to V
IN, max
)
Load (I
O
=I
O, min
to I
O, max
)
Temperature (T
ref
=T
A, min
to T
A, max
)
Output Ripple and Noise on nominal output
(V
IN
=V
IN, nom
,I
O
= I
O, max
, T
A
=T
A, min
to T
A, max
)
RMS (5Hz to 20MHz bandwidth)
Peak-to-Peak (5Hz to 20MHz bandwidth)
External Capacitance
Output Current
Output Current Limit Inception (Hiccup Mode )
(V
O
= 90% of V
O, set
)
Output Short-Circuit Current
(V
O
≤250mV)
( Hiccup Mode )
Efficiency
V
IN
= V
IN, nom
, T
A
=25°C, I
O
=I
O, max ,
V
O
= V
O,set
V
IN
= V
IN, nom
, T
A
=25°C, I
O
=0.5I
O, max ,
V
O
= V
O,set
Switching Frequency
Dynamic Load Response
(dI
o
/dt=0.1A/μs; V
IN
= V
IN, nom
; T
A
=25°C)
Load Change from Io= 50% to 75% or 25% to 50% of
I
o,max
Peak Deviation
Settling Time (Vo<10% peak deviation)
(dI
o
/dt=1.0A/μs; V
IN
= V
IN, nom
; T
A
=25°C)
Load Change from Io= 50% to 75% or 25% to 50% of
I
o,max
Peak Deviation
Settling Time (V
o
<10% peak deviation)
All
All
V
O, set
V
O
11.8
11.64
12.0
⎯
12.24
12.36
V
dc
% V
O, set
Device
Symbol
Min
Typ
Max
Unit
All
All
All
⎯
⎯
⎯
⎯
⎯
⎯
±0.2
±0.2
±1.0
% V
O, set
% V
O, set
% V
O, set
All
All
All
All
All
All
C
O, max
I
o
⎯
⎯
0
0
105
20
50
⎯
⎯
120
5
30
100
2,000
7
130
mV
rms
mV
pk-pk
μF
A
dc
% I
o
A
rms
I
O, lim
I
O, s/c
All
All
All
η
η
f
sw
92.5
91.5
400
%
%
kHz
All
All
V
pk
t
s
⎯
⎯
3
200
⎯
⎯
% V
O, set
μs
All
All
V
pk
t
s
⎯
⎯
5
200
⎯
⎯
% V
O, set
μs
Isolation Specifications
Parameter
Isolation Capacitance
Isolation Resistance
I/O Isolation Voltage (100% factory Hi-pot tested)
Device
All
All
All
Symbol
C
iso
R
iso
All
Min
⎯
100
⎯
Typ
1000
⎯
⎯
Max
⎯
⎯
2250
Unit
pF
MΩ
V
dc
General Specifications
Parameter
Calculated Reliability based upon Telcordia SR-332
Issue 2: Method
I
Case 3 (I
O
=80%I
O, max
, T
A
=40°C,
airflow = 200 lfm, 90% confidence)
Weight (Open Frame)
Weight (with Heatplate)
Device
All
All
All
All
Symbol
FIT
MTBF
Min
Typ
235.0
4,254,493
21
(0.77)
33
(1.16)
Max
Unit
10 /Hours
Hours
g
(oz.)
g
(oz.)
9
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Data Sheet
June 29, 2009
Feature Specifications
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter
Remote On/Off Signal Interface
(V
IN
=V
IN, min
to V
IN, max
; open collector or equivalent,
Signal referenced to V
IN-
terminal)
Negative Logic: device code suffix “1”
Logic Low = module On, Logic High = module Off
Positive Logic: No device code suffix required
Logic Low = module Off, Logic High = module On
Logic Low - Remote On/Off Current
Logic Low - On/Off Voltage
Logic High Voltage – (Typ = Open Collector)
Logic High maximum allowable leakage current
Turn-On Delay and Rise Times
(I
O
=I
O, max ,
V
IN
=V
IN, nom,
T
A
= 25 C)
Case 1: Input power is applied for at least 1 second
and then the On/Off input is set from OFF to ON (T
delay
= from instant at which V
IN
=V
IN, min
until V
O
= 10% of V
O,
)
Case 2: On/Off input is set to Logic Low (Module
ON) and then input power is applied (T
delay
from
instant at which V
IN
= V
IN, min
until V
o
=10% of V
O,set
)
Output voltage Rise time (time for V
o
to rise from 10%
of V
o,set
to 90% of V
o, set
)
Output voltage overshoot – Startup
I
O
= I
O, max
; V
IN
=V
IN, min
to V
IN, max
, T
A
= 25 C
Remote Sense Range
Output Voltage Adjustment Range
Output Overvoltage Protection
Overtemperature Protection – Hiccup Auto Restart
Input Undervoltage Lockout
Turn-on Threshold
Turn-off Threshold
Hysterisis
Input Overvoltage Lockout
Turn-on Threshold
Turn-off Threshold
Hysterisis
All
V
OVLO
76
⎯
1
79
81
2
⎯
83
⎯
Vdc
Vdc
Vdc
o
o
Device
Symbol
Min
Typ
Max
Unit
All
All
All
All
I
on/off
V
on/off
V
on/off
I
on/off
⎯
-0.7
⎯
⎯
0.3
⎯
5
⎯
1.0
1.2
10
mA
V
dc
V
dc
μA
All
T
delay
―
20
―
msec
All
All
All
All
All
All
All
All
T
delay
T
rise
―
―
―
5
―
150
12
3
10
msec
msec
% V
O, set
% V
O, set
% V
O, set
V
dc
O
V
SENSE
90
V
O, limit
T
ref
V
UVLO
⎯
30
1
34
32
2
13.8
⎯
⎯
135
110
16.5
⎯
36
⎯
3
C
V
dc
V
dc
V
dc
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Data Sheet
June 29, 2009
Characteristic Curves
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
The following figures provide typical characteristics for the EHW007A0B (12.0V, 7A) at 25 C. The figures are
identical for either positive or negative remote On/Off logic.
OUTPUT CURRENT OUTPUT VOLTAGE
V
O
(V) (200mV/div)
o
95
EFFICIENCY,
η
(%)
90
85
80
75
70
0
1
2
3
4
5
6
7
OUTPUT CURRENT, I
O
(A)
Vin = 36V
Vin = 48V
Vin = 75V
Io(A) (2A/div)
TIME, t (100µs/div)
Figure 1. Converter Efficiency versus Output Current.
Figure 4. Transient Response to 1.0A/µS Dynamic
Load Change from 50% to 75% to 50% of full load.
On/Off VOLTAGE
OUTPUT VOLTAGE
V
On/Off
(V) (5V/div)
V
O
(V) (5V/div)
OUTPUT VOLTAGE
V
O
(V) (50mV/div)
TIME, t (2μs/div)
TIME, t (5ms/div)
Figure 2. Typical output ripple and noise (V
IN
= V
IN,NOM
,
I
o
= I
o,max
).
OUTPUT CURRENT OUTPUT VOLTAGE
V
O
(V) (200mV/div)
Figure 5. Typical Start-up Using Remote On/Off,
negative logic version shown (V
IN
= V
IN,NOM
, I
o
= I
o,max
).
INPUT VOLTAGE
OUTPUT VOLTAGE
V
IN
(V) (20V/div)
V
O
(V) (5V/div)
Io(A) (2A/div)
TIME, t (200µs/div)
TIME, t (20ms/div)
Figure 3. Transient Response to 0.1A/µS Dynamic
Load Change from 50% to 75% to 50% of full load.
Figure 6. Typical Start-up Using Input Voltage (V
IN
=
V
IN,NOM
, I
o
= I
o,max
).
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