GE
Datasheet
EHHD024A0A HAMMERHEAD* Series; DC-DC Converter Power Modules
18-75Vdc Input; 5Vdc, 24A, 120W Output
RoHS Compliant
Applications
Distributed Power Architectures
Wireless Networks
Enterprise Networks including Power over Ethernet (PoE)
Industrial Equipment
Options
Negative Remote On/Off logic (preferred)
Over current/Over temperature/Over voltage protections
(Auto-restart) (preferred)
th
1/8
Brick Heat plate for 1/8th heatsinks
1/4th Brick heat plate with unthreaded inserts
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
58.4mm x 22.8mm x 8.9mm
(2.30 in x 0.9 in x 0.35 in)
Ultra wide input voltage range: 18-75 V
Tightly regulated output
Remote sense
Output Voltage adjust: 90% to 110% of V
Constant switching frequency
Positive remote On/Off logic
Output overcurrent and overvoltage protection
Overtemperature protection
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. 60950-107, 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 EHHD024A0A [HAMMERHEAD*] Series, eighth-brick, low-height power modules are isolated dc-dc converters which provide a
single, precisely regulated output voltage over an ultra-wide input voltage range of 18-75V
nominal output voltage rated for 24A
output current. The module incorporates GE’s vast heritage for reliability and quality, while
dc
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 V
features include remote On/Off, remote sense, output voltage adjustment, overvoltage, overcurrent and overtemperature
protection. An optional heat plate allows for external standard, eighth-brick or quarter-brickheat sink attachment to achieve
higher output current in high temperature applications.
*
Trademark of General Electric Corporation.
#
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
February 28, 2014 ©2014 General Electric Corporation. All rights reserved. Page 1
. The EHHD024A0A provides 5Vdc
dc
=24Vdc and VIN=48Vdc. Standard
IN
GE
Datasheet
EHHD024A0A Series: DC-DC Converter Power Module
18 to 75Vdc Input; 5Vdc, 24A, 120W 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
⎯ ⎯
* 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 = 24Vdc, (IO = 0, module enabled)
VIN = 48V, (IO = 0, module enabled)
Input Stand-by Current All
(VIN = 24 to 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
IN,No load
I
IN,stand-by
IN
5 11 mA
-0.3 80 Vdc
-0.3 100 Vdc
-40 85 °C
-40 105 °C
-55 125 °C
4000 m
2250 Vdc
7.3 7.8 Adc
120
80
mA
Input Reflected Ripple Current, peak-to-peak
(5Hz to 20MHz, 12μH source impedance; V
See Test configuration section)
Input Ripple Rejection (120Hz) All 60 dB
IN, min
to V
IN, max, IO
= I
Omax
;
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 15 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.
February 28, 2014 ©2014 General Electric Corporation. All rights reserved. Page 2
GE
Datasheet
EHHD024A0A Series: DC-DC Converter Power Module
18 to 75Vdc Input; 5Vdc, 24A, 120W Output
Electrical Specifications (continued)
Unless otherwise indicated, specifications apply at VIN = 48Vdc, resistive load, and TA = 25°C conditions.
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)
Adjustment Range (*Vin > 20V) All V
Selected by external resistor
O, adj
Output Regulation
Line (VIN=V
Load (IO=I
Temperature (T
Output Ripple and Noise on nominal output
Measured with 10uF Tantalum||1uF ceramic
(VIN=24 to 48, IO=80% I
IN, min
O, min
to V
to I
ref=TA, min
) All
O, max
IN, max
)
to T
) All
A, max
All
, TA=25)
O, max
RMS (5Hz to 20MHz bandwidth) All 30 mV
Peak-to-Peak (5Hz to 20MHz bandwidth) All 100 mV
External Capacitance All C
Output Current All I
Output Current Limit Inception (Hiccup Mode )
(VO= 90% of V
Output Short-Circuit Current
(VO≤250mV) ( Hiccup Mode )
) 5
O, set
All I
O, max
O
I
O, lim
O, s/c
Efficiency
VIN=24V, TA=25°C, IO=24A, VO = 5V All η 92 %
VIN=48V, TA=25°C, IO=24A, VO = 5V All η 91.5 %
Switching Frequency All f
sw
Dynamic Load Response
(dIo/dt=0.1A/μs; 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
4.93 5 5.07 V
-3.0
⎯
+3.0 % V
-10 +10* % V
⎯ ⎯
⎯ ⎯
⎯ ⎯
0
⎯
±0.2 % V
±0.2 % V
±1.5
10,000 μF
% V
dc
O, set
O, set
O, set
O, set
O, set
rms
pk-pk
0 24 Adc
26.5 29 Adc
1.2 A
rms
280 kHz
⎯
⎯
3
800
⎯
⎯
% V
μs
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
⎯
10
⎯ ⎯
1000
⎯ ⎯
⎯
pF
MΩ
2250 Vdc
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
, TA=40°C, airflow = 200 lfm, 90% confidence)
O, max
All FIT 112.7
All MTBF 8,869,389 Hours
Weight (Open Frame) All 23(0.8) g (oz.)
Weight (with Heatplate) All 37(1.3) g (oz.)
February 28, 2014 ©2014 General Electric Corporation. All rights reserved. Page 3
9
10
/Hour
s
GE
Datasheet
EHHD024A0A Series: DC-DC Converter Power Module
18 to 75Vdc Input; 5Vdc, 24A, 120W 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
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 Overvoltage Protection
Overtemperature Protection – Hiccup Auto Restart
Input Undervoltage Lockout All V
1
– Module complies with 7Vmax with Trim Pin short to Sense+, with and without external cap. For Open Loop condition max OVP was 7.3V with min. 220µF external cap
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
= on/off pin transition until VO = 10% of V
(T
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 5 6.7 Vdc
⎯ ⎯
0.15 mA
⎯
0.6 Vdc
20 μA
= 25oC)
IN, min
IN
o, set
to V
)
O, set
from
= V
IN, min
until Vo=10% of V
delay
O,set
)
)
, TA = 25 oC
IN, max
1
All T
All T
All
All V
Open
frame
Heat
Plate
All T
— 35 — msec
delay
— 35 - msec
delay
rise
SENSE
O, limit
T
ref
T
ref
UVLO
— 20 msec
— 3 % V
10 % V
5.9
⎯
7.0 Vdc
135 OC
120 OC
⎯
17.5 V
15 15.5 Vdc
O, set
O, set
dc
Hysteresis 1 2 Vdc
Input Overvoltage Lockout All V
Turn-on Threshold 76 79
Turn-off Threshold
Hysteresis 1 2
OVLO
Vdc
Vdc
⎯
⎯
81 Vdc
⎯
February 28, 2014 ©2014 General Electric Corporation. All rights reserved. Page 4
V
V
V
GE
Datasheet
EHHD024A0A Series: DC-DC Converter Power Module
18 to 75Vdc Input; 5Vdc, 24A, 120W Output
Characteristic Curves
The following figures provide typical characteristics for the EHHD024A0A (5V, 24A) at 25 OC. The figures are identical for either
positive or negative remote On/Off logic.
95
Vin=18V
90
85
80
75
EFFICIENCY, η (%)
70
0 4 8 12 16 20 24
Vin=24V
Vin=36V
OUTPUT CURRENT, IO (A) TIME, t (200µs/div)
Figure 1. Converter Efficiency versus Output Current.
Vin=48V
Vin=75V
18
(V) (200mV/div)
O
Io(A) (5A/div) V
OUTPUT CURRENT OUTPUT VOLTAGE
Figure 4. Transient Response to 0.1A/µS Dynamic Load Change
from 50% to 75% to 50% of full load, Vin=48V.
in
24
in
48Vin
(V) (50mV/div)
O
V
OUTPUT VOLTAGE
75
in
TIME, t (2μs/div)
o
= I
o,max
Figure 2. Typical output ripple and noise (I
(V) (200mV/div)
O
Io(A) (5A/div) V
OUTPUT CURRENT OUTPUT VOLTAGE
TIME, t (200µs/div) TIME, t (10ms/div)
). Figure 5. Typical Start-up Using Remote On/Off, negative logic
Figure 3. Transient Response to 0.1A/µS Dynamic Load
Change from 50% to 75% to 50% of full load, Vin=24V
(V) (5V/div)
On/Off
(V) (2V/div) V
O
OUTPUT VOLTAGE On/Off VOLTAGE
V
version shown (V
IN
= 48V, Io = I
TIME, t (10ms/div)
o,max
).
(V) (20V/div)
IN
(V) (2V/div) V
O
OUTPUT VOLTAGE INPUT VOLTAGE
V
Figure 6. Typical Start-up Using Input Voltage (VIN = 48V, Io=
o,max
).
I
February 28, 2014 ©2014 General Electric Corporation. All rights reserved. Page 5
GE
EHHD024A0A Series: DC-DC Converter Power Module
18 to 75Vdc Input; 5Vdc, 24A, 120W Output
Test Configurations
Vout+
Vout-
33-10 0μF
V
CURRENT PROBE
RESISTIVE
LOAD
R
contact Rdistribution
O
R
contact Rdistribution
x 100 %
Vin +
Vin-
R
LOAD
TO OSCILLOSCOPE
L
TEST
12μH
CS 220μF
BAT TERY
NOTE: M easure inpu t reflected ri pple current wi th a simula ted
E.S .R.< 0.1 Ω
@ 20 °C 10 0kHz
source inductance (L
possi ble batt ery impedance . Measure cur rent as s hown
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 volt age mea surements to be t aken at the mod ule
1uF
10uF
GRO UND PLANE
termin als, a s sho wn abov e. If sockets ar e used then
Kelvi n conn ections are requ ired at the mo dule termin als
to av oid me asureme nt errors due to sock et 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 required at the module terminals
to avoid measurement errors due to socket contact
resistance.
Vin+
V
IN
Vin-
Figure 9. Output Voltage and Efficiency Test Setup.
V
. I
O
Efficiency
=
η
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 100μF 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 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
The input pins of the module are not operator
Another SELV reliability test is conducted on the whole
Note: Do not ground either of the input pins of the module
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
15 A fast-acting fuse in the ungrounded lead.
pin and one V
IN
both the input and output pins are to be kept floating.
accessible.
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.
without grounding one of the output pins. This may
allow a non-SELV voltage to appear between the
output pins and ground.
Datasheet
pin are to be grounded, or
OUT
February 28, 2014 ©2014 General Electric Corporation. All rights reserved. Page 6
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