GE
Data Sheet
EHHD020A0FHammerhead™ Series; DC-DC Converter Power Modules
18-75Vdc Input; 3.3Vdc, 20.0A, 66W Output
RoHS Compliant
Applications
Distributed Power Architectures
Wireless Networks
Access and Optical Network Equipment
Industrial Equipment
Options
Negative Remote On/Off logic (preferred)
Over current/Over temperature/Over voltage protections
(Auto-restart) (preferred)
Heat plate versions (-H)
Surface Mount version (-S)
Features
Compliant to RoHS II EU “Directive 2011/65/EU (-Z versions)
Compliant to REACH Directive (EC) No 1907/2006
Flat and high efficiency curve
Industry standard, DOSA compliant footprint
57.9mm x 22.8mm x 7.6mm
(2.28 in x 0.9 in x 0.30 in)
Low profile height and reduced component skyline
Ultra wide input voltage range: 18-75 V
Tightly regulated output
Remote sense
Output Voltage adjust: 80% to 110% of V
Constant switching frequency
Positive remote On/Off logic
Input under/over voltage protection
Output overcurrent and overvoltage protection
Overtemperature protection
No reverse current during output shutdown
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
ANSI/UL*60950-1-2011 and CAN/CSA† C22.2 No. 60950-1-
07, Second Edition + A1:2011 (MOD), dated March 19, 2011;
and DIN EN 60950-1 (VDE‡ 0805 Teil 1):2011-01; EN 609501:2006 + A11:2009 + A1:2010, DIN EN 60950-1/A12 (VDE
0805-1/A12):2011-08; EN 60950-1/A12:2011-02, IEC 609501(ed.2);am1:2009
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
standards
**
ISO
9001 and ISO 14001 certified manufacturing facilities
dc
O,nom
§
¤
PoE
Description
The EHHD020A0F [Hammerhead™] Series, eighth-brick, low-height power modules are isolated dc-dc converters
that provide a single, precisely regulated output voltage over an ultra wide input voltage range of 18-75V
EHHD020A0F provides 3.3V
for reliability and quality, while also using the latest in technology, and component and process standardization to achieve highly
competitive cost. The open frame module construction, available in both surface-mount and through-hole packaging, enable
designers to develop cost and space efficient solutions. The module achieves typical full load efficiency greater than 91% at
=24Vdc or at VIN=48Vdc. Standard features include remote On/Off, remote sense, output voltage adjustment, overvoltage,
V
IN
overcurrent and overtemperature protection. An optional heat plate allows for external standard, eighth-brick heat sink
attachment to achieve higher output current in high temperature applications.
* UL is a registere d trademark of Underwr iters Labor atories, I nc.
†
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-us e 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 Internat ional Organization of Standards
nominal output voltage rated for 20Adc output current. The module incorporates GE’s vast heritage
dc
. The
dc
April 4, 2013 ©2012 General Electric Company. All rights reserved. Page 1
GE
Data Sheet
EHHD020A0F Hammerhead™
Series; DC-DC Converter Power Modules
18-75Vdc Input; 3.3Vdc, 20.0A, 66W Output
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
Maximum Heat Plate Operating Temperature -18H, H T
(see Thermal Considerations section)
Storage Temperature All T
Altitude* All
I/O Isolation voltage (100% factory Hi-Pot tested) All
IN
IN,trans
A
C
stg
-0.3 80 Vdc
-0.3 100 Vdc
-40 85 °C
-40 110 °C
-55 125 °C
4000 m
2250 Vdc
* For higher altitude applications, contact your GE Sales Representative for alternative conditions of use.
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 18 24/48 75 Vdc
Maximum Input Current
(VIN= V
Input No Load Current
(VIN = 48V, IO = 0, module enabled)
Input Stand-by Current All
(VIN = 48V, module disabled)
Inrush Transient All I2t 0.5 A2s
IN, min
to V
IN, max
, VO= V
O, set
, IO=I
O, max
)
All I
All I
I
IN,stand-by
IN
IN,No load
4.4 5.0 Adc
70 mA
5 8 mA
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 1μH source impedance; V
Test configuration section)
Input Ripple Rejection (120Hz) All 50 dB
IN, min
to V
IN, max, IO
= I
Omax
; See
All 30 mA
p-p
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 10 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.
April 4, 2013 ©2012 General Electric Company. All rights reserved. Page 2
GE
Data Sheet
EHHD020A0F Hammerhead™
Series; DC-DC Converter Power Modules
18-75Vdc Input; 3.3Vdc, 20.0A, 66W Output
Electrical Specifications (continued)
Parameter Device Symbol Min Typ Max Unit
Nominal Output Voltage Set-point
VIN= 24V to 48V IO=I
O, max
, TA=25°C)
All V
O, set
Output Voltage
(Over all operating input voltage, resistive load, and temperature
All V
O
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
Output Ripple and Noise
(VIN=V
IN, min
to V
IN, max
, 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=24V, TA=25°C, IO=10A, VO = 3.3V All η 91.0 %
VIN=24V, TA=25°C, IO=20A, VO = 3.3V All η 91.0 %
VIN=48V, TA=25°C, IO=10A, VO = 3.3V All η 89.5 %
VIN=48V, TA=25°C, IO=20A, VO = 3.3V All η 91.0 %
Switching Frequency All f
sw
Dynamic Load Response
(dIo/dt=0.1A/s; VIN = 24V or 48V; TA=25°C; CO>100μF)
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)
All t
pk
s
3.24 3.30 3.36 V
3.20
0
10 30 mV
35 100 mV
3.40 V
±0.2 % V
±0.2 % V
±1.0
5,000 μF
% V
dc
dc
O, set
O, set
O, set
rms
pk-pk
0 20 Adc
21 24 26 Adc
5 A
rms
300 kHz
5
200
% V
s
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
Weight (Open Frame) All 19 (0.7) g (oz.)
Weight (with Heatplate) All 30 (1.1) g (oz.)
=80%I
O
, TA=40°C, airflow = 200 lfm, 90% confidence)
O, max
9
All FIT 317.3 10
All MTBF 3,151,604 Hours
/Hours
April 4, 2013 ©2012 General Electric Company. All rights reserved. Page 3
GE
Data Sheet
EHHD020A0F Hammerhead™
Series; DC-DC Converter Power Modules
18-75Vdc Input; 3.3Vdc, 20.0A, 66W Output
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
Turn-On Delay and Rise Times
(IO=I
Case 1: Input power is applied for at least 1 second,
Case 2: On/Off input is set to Logic Low (Module
ON) and then input power is applied
(T
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 80 110 % V
Output Overvoltage Protection
Overtemperature Protection – Hiccup Auto Restart
Heat Plate
Input Undervoltage Lockout All V
to V
IN, min
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
O, max , VIN=VIN, nom, TA
and then the On/Off input is set from OFF to ON
(T
= on/off pin transition until VO = 10% of V
delay
= VIN reaches V
delay
to 90% of V
o,set
; VIN=V
O, max
Turn-on Threshold
Turn-off Threshold
; open collector or equivalent,
IN, max
terminal)
IN-
on/off
on/off
on/off
on/off
-0.7
2.5
0.15 mA
0.6 Vdc
6.7 Vdc
25 μA
= 25oC)
— 20 — msec
delay
— 20 150 msec
delay
rise
SENSE
O, limit
T
ref
T
ref
UVLO
— 18 25 msec
— 3 % V
10 % V
3.8
4.3 Vdc
135 OC
120 OC
17 18 V
14 15 16 Vdc
O, set
O, set
O, set
dc
IN, min
)
O, set
All T
All T
until Vo=10% of V
IN, min
)
o, set
to V
, TA = 25oC
IN, max
O,set
)
All T
All
All V
Open
frame
Heat
Plate
Hysteresis 1 2 Vdc
Input Overvoltage Lockout All V
Turn-on Threshold 76 79
Turn-off Threshold
Hysteresis 1 2
OVLO
Vdc
Vdc
81 83 Vdc
April 4, 2013 ©2012 General Electric Company. All rights reserved. Page 4
GE
Data Sheet
EHHD020A0F Hammerhead™
Series; DC-DC Converter Power Modules
18-75Vdc Input; 3.3Vdc, 20.0A, 66W Output
Characteristic Curves
The following figures provide typical characteristics for the EHHD020A0F (3.3V, 20A) at 25oC. The figures are identical for either
positive or negative remote On/Off logic.
Io(A) (5A/div)
EFFICIENCY, (%)
OUTPUT CURRENT, IO (A) TIME, t (200µs/div)
Figure 1. Converter Efficiency versus Output Current. Figure 4. Transient Response to 0.1A/µS Dynamic Load
(V) (100mV/div)
O
OUTPUT VOLTAGE OUTPUT CURRENT
V
Change from 50% to 75% to 50% of full load, Vin=48V,
>100μF.
C
O
(V) (50mV/div)
O
V
OUTPUT VOLTAGE
TIME, t (2s/div)
Figure 2. Typical output ripple and noise (I
(V) (100mV/div) Io(A) (5A/div)
O
V
OUTPUT VOLTAGE OUTPUT CURRENT
TIME, t (200µs/div) TIME, t (10ms/div)
o = Io,max).
Figure 3. Transient Response to 0.1A/µS Dynamic Load Change
from 50% to 75% to 50% of full load, Vin=24V, C
>100μF.
O
(V) (2V/div)
On/Off
(V) (1V/div) V
O
OUTPUT VOLTAGE On/Off VOLTAGE
V
TIME, t (10ms/div)
Figure 5. Typical Start-up Using Remote On/Off, negative
logic version shown (V
(V) (10V/div)
IN
(V) (1V/div) V
O
OUTPUT VOLTAGE INPUT VOLTAGE
V
Figure 6. Typical Start-up Using Input Voltage (V
IN = 24V or 48V, Io = Io,max).
IN
= 24V, Io
= Io,max).
April 4, 2013 ©2012 General Electric Company. All rights reserved. Page 5
GE
Data Sheet
EHHD020A0F Hammerhead™
Series; DC-DC Converter Power Modules
18-75Vdc Input; 3.3Vdc, 20.0A, 66W Output
Test Configurations
Vout+
Vout-
33-10 0μF
V
CURRENT PR OBE
RESISTIVE
LOA D
R
contact Rdistribution
O
R
contact Rdistribution
x 100 %
Vin +
Vin-
R
LOAD
TO OSCILL OSCOPE
L
TEST
12μH
CS 220μF
BATTERY
NOTE: M easure i nput r eflected ri pple curr ent with a simula ted
E.S .R.<0 .1
@ 20° C 100kHz
source i nductance (L
possible battery impedance. Measure current as shown
abov e.
) of 12μH. Capacitor CS offs ets
TEST
Figure 7. Input Reflected Ripple Current Test Setup.
COPPER STRIP
V O (+)
SCOP E
V O ( – )
NOTE: A ll voltage measurements to be take n at the module
1uF
10uF
GRO UND PL ANE
termin als, as sho wn above. If sockets are used th en
Kelvi n conn ections are requ ired at the mo dule termin als
to av oid me asurement err ors due to socket conta ct
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 the module
terminals, as shown above. If sockets are used then
Kelvin connections are require d at the module terminals
to avoid measurement errors du e to socket contact
resistance.
Vin+
V
IN
Vin-
Figure 9. Output Voltage and Efficiency Test Setup.
V
. I
O
Efficiency
=
VIN. I
O
IN
Design Considerations
Input Filtering
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 33-100μF electrolytic capacitor
(ESR<0.7 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 VDE08051(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
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
10 A fast-acting fuse in the ungrounded lead.
pin are to be grounded, or
OUT
April 4, 2013 ©2012 General Electric Company. All rights reserved. Page 6
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