EHS15 – 3.3V Model
4118 14
th
Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
www.cd4power.com
EHS
15
-
620
0951462
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Page 1
Model
3.3V
Units
Parameter
Output Voltage Setpoint 3.25 – 3.35 Vdc
Line/Load Regulation Max 0.1% / 0.2% % Vo
Output total regulation 3.2 - 3.4 Vdc
Output adjust (note 4) 90-110 %Vo,nom
Remote-sense Comp. 10% V
Output Ripple & Noise (note 2) Max 100 mVp-p
Output Current 0 - 15 A
Efficiency (48V, Full load, 25C) Typ
90% %
External Capacitance 1,000 - 10,000 µF
Transient Response (typ) (note 3) ∆Vo 165 mV
25% step, 1A/µs Ts 400 µs
Over-voltage trip point (latching) 4.0-4.6 V
Over-current trip point (non-latching) Typ 20 A
All specifications, waveforms, charts at Ta=25C, Vin=48V, unless otherwise specified
EHS15 – 3.3V Model
4118 14
th
Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
www.cd4power.com
EHS
15
-
620
0951462
_C0
4
_
26Ju
n07
Page 2
Pin Assignments
Pin # Description Pin # Description Pin # Description
1 Vin (+) 4 Vout(-) 7 Sense +
2 Enable 5 Sense - 8 Vo (+)
3
Vin(
-
)
6
Vo adj
Parameter Conditions Min. Typ.
Max. Units
Input Input Voltage (Vin) 36 48 75 Vdc
Reflected Ripple Current See note (1) 10 ‘mA p-p
Inrush Transient 0.2 A
2
s
Input Voltage Transient 100mS 10% duty
cycle 100 V
Undervoltage Lockout Turn-on 32 35 Vdc
(non-latching) Turn-off 31 34 Vdc
Over-voltage lockout (non-latching) Turn-off 77 81 Vdc
Isolation Input-Output 1500 Vdc
Resistance; input-output 10 Mohm
Temperature Operating Ambient -40 90 °C
Storage -40 125 °C
Protection Over-Temperature (non-latching) Measured on PCB
130 °C
Physical Information Dimensions (max) 2.30”L x 0.82” W x 0.37”H (58.4 x 20.8 x 9.3 mm)
MTBF Calculated at 40C ambient, (Bellcore) 1,000,000 Hrs EHS15/20 Series
Demonstrated at 40C ambient with 90% confidence: 2,800,000 Hrs
Safety Complies with IEC/EN/CSA/UL 60950, provides basic insulation, input to output.
c-UL-us (US and Canada) recognized, TUV certified (Bauart).
EHS15 – 3.3V Model
4118 14
th
Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
www.cd4power.com
EHS
15
-
620
0951462
_C0
4
_
26Ju
n07
Page 3
Efficiency of EHS15-033 @ 25°C Ambient
75
77
79
81
83
85
87
89
91
4 6 8 10 12 14 16
Output Current [A]
Efficiency [%]
48Vin 36Vin 75Vin
Q4
EHS15
-
033 Enable with Pre
-
Bias
Output Voltage @ 0.5 V/div., 2 ms/div.
Prebias voltage =2.5 Vdc. Input Voltage 48 V
Load current = 0, Load capacitance = 1000 uF.
EHS15-033 Trim Up/Down Formula
10
100
1000
0% 2% 4% 6% 8% 10%
Delta (%)
Resistance (Kohms)
Rup (3.3 V)
Rdown
EHS15-033 Trim-up and Trim-down Resistance
Rup 5.10 Vnom
.
100
∆
%( )
.
1.225
∆
%
.
510
∆
%
10.2 K
Ω
Where
∆
%Vout Vnom( ) 100
.
Vnom
and, Vout = Target output voltage
Where
Rdown
∆
%( ) 510
∆
%
10.2 K
Ω ∆
%Vnom Vout( ) 100
.
Vnom
EHS15-033 Thermal Derating
Airflow from Vin to Vo, Tj = 120ºC
0
5
10
15
20
25 35 45 55 65 75 85
Ambient Temperature [ºC]
Q4.3.nov.03
Output Current [A]
400 LFM
300 LFM
200 LFM
100 LFM
EHS15-033 Thermal Derating
Airflow from Vo(-) to Vo(+), Tj = 120ºC
0
5
10
15
20
25 35 45 55 65 75 85
Ambient Temperature [ºC]
Q4.3.nov.03
Output Current [A]
400 LFM
300 LFM
200 LFM
100 LFM
EHS15 – 3.3V Model
4118 14
th
Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
www.cd4power.com
EHS
15
-
620
0951462
_C0
4
_
26Ju
n07
Page 4
EHS15-033 Startup Sequence from Vin EHS15-033 Startup Sequence from Enable
Top Trace: Vout @ 0.5 V/div. Top Trace: Vout @ 0.5 V/div.
Bot. Trace: Vin @ 20V/div. (48Vdc) Bot. Trace: Venable @ 2 V/div.
Horiz. @ 50 ms/div. Horiz. @ 5 ms/div.
Load: 15 A, 0 uF, Turn-on delay: 110mS Load: 15 A, 0 uF, Turn-on delay: 6.7 ms
EHS15-033 Transient Response 50-75% step, 1A/
µ
µµ
µ
s EHS15-033 Transient Response 50- 25% step, 1A/µ
µµ
µs
EHS15-033 Input Reflected Ripple Current
Input Current @ 50 mA/div., 20 us/div. (11 mApp)
Input Voltage: 48 V, Load Current: 15 A
Note: see test circuit on following page.
EHS15-033 Output Ripple Voltage, Io=15A
EHS15 – 3.3V Model
4118 14
th
Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
www.cd4power.com
EHS
15
-
620
0951462
_C0
4
_
26Ju
n07
Page 5
Notes
:
1. Input Reflected Ripple is specified when measured with the filter shown below
2. Output Ripple and noise is specified when measured with a 10uF tantalum and a 1uF ceramic
capacitor at the converter output pins
3. Transient response is specified with a 470uF tantalum capacitor at the output of the converter
4. Trim resistor connection: Rtrim-up connected from Vo adj to Vo(+), Rtrim –down connected from
Vo adj to Vo(
-
).
3 3 uF ,
ES R <0.7 O hm s
@ 10 0 k H z
Vin
L2
1 2 u F
DC-DC
Converter
RTN
2 20 u F ,
E S R <0.1 O hm s
@ 10 0 kH z
i
c
i
s
Safety considerations
The EHS series of converters are certified to IEC/EN/CSA/UL 60950. If this product is built into information technology
equipment, the installation must comply with the above standard.
An external input fuse (5A to 30A recommended), must be used to meet the above requirements.
The output of the converter [Vo(+)/Vo(-)] is considered to remain within SELV limits when the input to the converter
meets SELV or TNV-2 requirements.
The converters and materials meet UL 94V-0 flammability ratings.
EHS15-033 Enable Pin Connection Table
ENABLE POWER SUPPLY DISABLE POWER SUPPLY
NEGATIVE LOGIC VERSION 0V < Venable < 0.8V
(internal pull-up > 50Kohms @
5V)
2.5V < Venable < 15V
(external pull-up > 1Kohms)
POSITIVE LOGIC VERSION 2.5V < Venable < 15V
(external pull-up > 1Kohms)
0V < Venable < 0.8V
(internal pull-up > 50Kohms @
5V)
Note: Power Supply has internal pull-up resistor. Enable pin is in a valid “high” state if left open-circuit.
EHS15 – 3.3V Model
4118 14
th
Avenue, Unit 4
Markham, Ontario L3R 0J3
1-866-740-1232
www.cd4power.com
EHS
15
-
620
0951462
_C0
4
_
26Ju
n07
Page 6
C&D Technologies, Inc. reserves the right to alter or improve the specification, internal design or manufacturing process at any time, without notice.
Please check with your supplier or visit our website to ensure that you have the current and complete specification for your product before use.
C&D Technologies, Inc. 2007
No part of this publication may be copied, transmitted, or stored in a retrieval system or reproduced in any way including, but not limited to,
photography, photocopy, magnetic or other recording means, without prior written permission from C&D Technologies, Inc.
Instructions for use are available from: www.cd4power.com
RoHS Compliant
The EHS series of converters is in compliance with the European Union Directive 2002/95/EC (RoHS) with respect to the
following sustances: lead (Pb), mercury (Hg), cadmium (Cd), hexavalent chromium, polybrominated biphenyls (PBB) or
polybrominated diphenyl ethers (PBDE).
Part Number Designations
