Data Sheet
f
October 2, 2009
EHW007A0B Series (Eighth-Brick) DC-DC Converter Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
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)
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
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
No.60950-1, and EN60950-1(
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
ISO
¤
802.3
PoE standards
**
9001 and ISO 14001 certified manufacturing
facilities
VDE
‡
0805-1)
§
o,nom
†
C22.2
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
- 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 Laboratori es, 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 e quipment . 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 Orga nization of Standards
Document No: DS08-002 ver. 1.02
PDF name: ehw007_ds.pd
IN = 36
Data Sheet
October 2, 2009
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Absolute Maximum Ratings
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 Device Symbol Min Max Unit
Input Voltage
Continuous All V
Transient, operational (≤100 ms) All V
Operating Ambient Temperature All T
IN
IN,trans
A
-0.3 80 Vdc
-0.3 100 Vdc
-40 85 °C
(see Thermal Considerations section)
Storage Temperature All T
I/O Isolation voltage (100% factory Hi-Pot tested) All
stg
⎯ ⎯
-55 125 °C
2250 Vdc
Electrical Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions.
Parameter Device Symbol Min Typ Max Unit
Operating Input Voltage All VIN 36 48 75 Vdc
Maximum Input Current
(VIN= V
IN, min
to V
IN, max
, IO=I
O, max
)
Input No Load Current
(VIN = V
, IO = 0, module enabled)
IN, nom
Input Stand-by Current All
(VIN = V
, module disabled)
IN, nom
Inrush Transient All I2t 0.5 A2s
All I
All I
IN,max
IN,No load
I
IN,stand-by
2.75 3.0 Adc
70 mA
5 8 mA
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; V
IO= I
; See Test configuration section)
Omax
IN, min
to V
IN, max,
All 30 mA
p-p
Input Ripple Rejection (120Hz) 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.
LINEAGE POWER 2
Data Sheet
October 2, 2009
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Nominal Output Voltage Set-point
VIN=V
IN, min
, IO=I
, TA=25°C) All V
O, max
O, set
Output Voltage
(Over all operating input voltage, resistive load, and
All V
O
temperature conditions until end of life)
Output Regulation
Line (VIN=V
Load (IO=I
Temperature (T
IN, min
O, min
to V
to I
O, max
ref=TA, min
) All
IN, max
)
to T
) All
A, max
All
⎯ ⎯ ±0.2 % V
Output Ripple and Noise on nominal output
(VIN=V
IN, nom
,IO= I
O, max
, TA=T
A, min
to T
)
A, max
RMS (5Hz to 20MHz bandwidth) All
Peak-to-Peak (5Hz to 20MHz bandwidth) All
External Capacitance All C
Output Current All I
Output Current Limit Inception (Hiccup Mode )
(VO= 90% of V
O, set
)
Output Short-Circuit Current
(VO≤250mV) ( Hiccup Mode )
All
All I
O, max
I
O, lim
O, s/c
o
Efficiency
VIN= V
VIN= V
Switching Frequency All f
, TA=25°C, IO=I
IN, nom
, TA=25°C, IO=0.5I
IN, nom
O, max , VO
O, max , VO
= V
All η 92.5 %
O,set
= V
All η 91.5 %
O,set
sw
Dynamic Load Response
(dIo/dt=0.1A/μs; VIN = V
IN, nom
; TA=25°C)
Load Change from Io= 50% to 75% or 25% to 50% of
I
o,max
Peak Deviation All V
Settling Time (Vo<10% peak deviation)
(dIo/dt=1.0A/μs; VIN = V
IN, nom
; TA=25°C)
Load Change from Io= 50% to 75% or 25% to 50% of
I
o,max
Peak Deviation All V
Settling Time (Vo<10% peak deviation)
pk
All t
s
pk
All t
s
11.8 12.0 12.24 V
11.64
⎯ ⎯
⎯ ⎯
⎯
⎯
0
0
⎯
20 30 mV
50 100 mV
⎯
⎯
12.36 % V
±0.2 % V
±1.0
2,000 μF
7 Adc
105 120 130
5 A
% V
% I
dc
O, set
O, set
O, set
O, set
pk-pk
rms
rms
o
400 kHz
⎯
⎯
3
200
⎯
⎯ μs
% V
O, set
⎯
⎯
5
200
⎯
⎯ μs
% V
O, set
Isolation Specifications
Parameter Device Symbol Min Typ Max Unit
Isolation Capacitance All C
Isolation Resistance All R
I/O Isolation Voltage (100% factory Hi-pot tested) All All
iso
iso
⎯
100
⎯ ⎯
1000
⎯ ⎯
⎯
2250 Vdc
pF
MΩ
General Specifications
Parameter Device Symbol Min Typ Max Unit
Calculated Reliability based upon Telcordia SR-332
Issue 2: Method
I Case 3 (I
=80%I
O
O, max
, TA=40°C,
airflow = 200 lfm, 90% confidence)
Weight (Open Frame) All
Weight (with Heatplate) All
LINEAGE POWER 3
All FIT 235.0 109/Hours
All MTBF 4,254,493 Hours
21
(0.77)
33
(1.16)
g
(oz.)
g
(oz.)
Data Sheet
October 2, 2009
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Feature Specifications
Unless otherwise indicated, specifications apply over all operating input voltage, resistive load, and temperature
conditions. See Feature Descriptions for additional information.
Parameter Device Symbol Min Typ Max Unit
Remote On/Off Signal Interface
(VIN=V
Signal referenced to V
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 All I
Logic Low - On/Off Voltage All V
Logic High Voltage – (Typ = Open Collector) All V
Logic High maximum allowable leakage current All I
Turn-On Delay and Rise Times
(IO=I
Case 1: Input power is applied for at least 1 second
and then the On/Off input is set from OFF to ON (T
= from instant at which V
Case 2: On/Off input is set to Logic Low (Module
ON) and then input power is applied (T
instant at which V
Output voltage Rise time (time for Vo to rise from 10%
of V
Output voltage overshoot – Startup
IO= I
Remote Sense Range All V
Output Voltage Adjustment Range All 90 110 % V
Output Overvoltage Protection
Overtemperature Protection – Hiccup Auto Restart All T
Input Undervoltage Lockout All V
Turn-on Threshold
Turn-off Threshold
Hysterisis 1 2 3 Vdc
Input Overvoltage Lockout All V
Turn-on Threshold 76 79
Turn-off Threshold
Hysterisis 1 2
to V
IN, min
O, max , VIN=VIN, nom, TA
o,set
O, max
IN, max
to 90% of V
; VIN=V
IN, min
= V
IN
o, set
to V
; open collector or equivalent,
terminal)
IN-
on/off
on/off
on/off
on/off
⎯
-0.7
⎯
⎯ ⎯
0.3 1.0 mA
⎯
5 V
1.2 Vdc
dc
10 μA
= 25oC)
until VO = 10% of V
IN=VIN, min
until Vo=10% of V
IN, min
)
, TA = 25 oC
IN, max
delay
from
O,set
)
delay
All T
O,
All T
All T
All
All V
― 20 ― msec
delay
― ― 150 msec
delay
rise
SENSE
O, limit
ref
UVLO
OVLO
― 5 12 msec
― 3 % V
10 % V
13.8
⎯
⎯
135
16.5 Vdc
⎯
O, set
O, set
O, set
O
C
⎯
34 36 V
30 32
⎯
Vdc
dc
Vdc
Vdc
⎯
⎯
81 83 Vdc
⎯
LINEAGE POWER 4
Data Sheet
V
V
V
October 2, 2009
EHW007A0B Series Eighth-Brick Power Modules
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Characteristic Curves
The following figures provide typical characteristics for the EHW007A0B (12.0V, 7A) at 25oC. The figures are
identical for either positive or negative remote On/Off logic.
95
90
85
80
Vin = 36
Vin = 48
Vin = 75
(V) (200mV/div)
O
75
70
EFFICIENCY, η (%)
01234567
OUTPUT CURRENT, IO (A)
Io(A) (2A/div) V
OUTPUT CURRENT OUTPUT VOLTAGE
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.
(V) (5V/div)
On/Off
(V) (50mV/div)
O
V
OUTPUT VOLTAGE
(V) (5V/div) V
O
TIME, t (2μs/div)
Figure 2. Typical outpu t ripple and noise (V
I
o = Io,max).
IN = VIN,NOM,
OUTPUT VOLTAGE On/Off VOLTAGE
V
Figure 5. Typical Start-up Using Remote On/Off,
negative logic version shown (VIN = VIN,NOM, Io = Io,max).
TIME, t (5ms/div)
(V) (20V/div)
(V) (200mV/div)
O
Io(A) (2A/div) V
OUTPUT CURRENT OUTPUT VOLTAGE
TIME, t (200µs/div)
Figure 3. Transient Response to 0.1A /µS Dynamic
Load Change from 50% to 75% to 50% of full load.
IN
(V) (5V/div) V
O
OUTPUT VOLTAGE INPUT VOLTAGE
V
TIME, t (20ms/div)
Figure 6. Typical Start-up Using Input Voltage (VIN =
V
IN,NOM, Io = Io,max).
LINEAGE POWER 5
Data Sheet
October 2, 2009
36–75Vdc Input; 12.0Vdc Output; 7A Output Current
Test Configurations
33-10 0μF
SCOP E
Vout+
Vout-
V
CURRENT P ROBE
RESISTIVE
LOA D
R
contactRdistribution
O
R
contactRdistribution
x 100 %
Vin+
Vin-
R
LOAD
TO OSCILL OSCOPE
L
TEST
12μH
CS 220μF
BAT TERY
NOTE: M easure input r eflected ri pple current wi th a simulated
E.S .R.<0 .1Ω
@ 20° C 100kHz
source inductance (L
possi ble batt ery impedance . Meas ure curre nt as show n
above.
) of 12μH. Capacitor CS offs ets
TEST
Figure 7. Input Reflected Ripple Current Test
Setup.
COPPER STRIP
V O (+)
V O ( – )
NOTE: A ll volt age mea surements to be tak en at the module
1uF
10uF
GROUND PLANE
termin als, as shown ab ove. If sock ets are used th en
Kelvi n conn ections are required at th e module te rminals
to av oid me asureme nt errors due to s ocket contact
resistance.
Figure 8. Output Ripple and Noise Test Setup.
R
R
contact
distribution
R
R
contact
distribution
NOTE: All voltage measurements to be taken at t he module
terminals, as shown above. If sockets are used then
Kelvin connections are required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Vin+
V
IN
Vin-
Figure 9. Output Voltage and Effici ency Tes t
Setup.
. I
V
O
Efficiency
=
η
VIN. I
O
IN
EHW007A0B Series Eighth-Brick Power Modules
Design Considerations
Input Filt ering
The power module should be connected to a low
ac-impedance source. Highly inductive source
impedance can affect the stability of the power
module. For the test configuration in Figure 7 a 33100μF electrolytic capacitor (ESR<0.7Ω at 100kHz),
mounted close to the power module helps ensure the
stability of the unit. Consult the factory for further
application guidelines.
Safety Considerations
For safety-agency approval of the system in which the
power module is used, the power module must be
installed in compliance with the spacing and
separation requirements of the end-use safety agency
standard, i.e. UL60950-1, CSA C22.2 No.60950-1,
and VDE0805-1(IEC60950-1).
If the input source is non-SELV (ELV or a hazardous
voltage greater than 60 Vdc and less than or equal to
75Vdc), for the module’s output to be considered as
meeting the requirements for safety extra-low voltage
(SELV), all of the following must be true:
The input source is to be provided with reinforced
insulation from any other hazardous voltages,
including the ac mains.
One V
pin and one V
IN
pin are to be
OUT
grounded, or both the input and output pins are
to be kept floating.
The input pins of the module are not operator
accessible.
Another SELV reliability test is conducted on the
whole system (combination of supply source and
subject module), as required by the safety
agencies, to verify that under a single fault,
hazardous voltages do not appear at the
module’s output.
Note: Do not ground either of the input pins of the
module without grounding one of the output
pins. This may allow a non-SELV voltage to
appear between the output pins and ground.
The power module has extra-low voltage (ELV)
outputs when all inputs are ELV.
All flammable materials used in the manufacturing of
these modules are rated 94V-0, or tested to the
UL60950 A.2 for reduced thickness.
For input voltages exceeding –60 Vdc but less than or
equal to –75 Vdc, these converters have been
evaluated to the applicable requirements of BASIC
INSULATION between secondary DC MAINS
DISTRIBUTION input (classified as TNV-2 in Europe)
and unearthed SELV outputs.
The input to these units is to be provided with a
maximum 6 A fast-acting fuse in the ungrounded lead.
LINEAGE POWER 6
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