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E Class Converters
EHS20 – 1.5V Model
OBSOLETE PRODUCT
Model
Parameter
1.5V
Output Voltage Setpoint
Units
1.48 – 1.52
Vdc
0.1% / 0.2%
% Vo
Output total regulation
1.45 – 1.55
Vdc
Output adjust (note 4)
90-110
%Vo,nom
Remote-sense Comp.
10%
V
Line/Load Regulation
Output Ripple & Noise (note 2)
Max
100
Max
Output Current
Efficiency (48V, Full load, 25C)
Typ
External Capacitance
Transient Response (typ) (note 3)
25% step, 1A/μs
0-20
A
86%
%
1,000 – 10,000
μF
ΔVo
150
mV
Ts
400
μs
1.80 – 2.03
V
25
A
Over-voltage trip point (latching)
Over-current trip point (non-latching)
mVp-p
Typ
All specifications, waveforms, charts at Ta=25C, Vin=48V, unless otherwise specified
For full details go to
www.murata-ps.com/rohs
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Technical enquiries email: sales@murata-ps.com, tel: +508 339 3000
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EHS20-6200981505_D01_28/04/08
E Class Converters
Murata Power Solutions
EHS20 – 1.5V Model
Parameter
Conditions
Input
Input Voltage (Vin)
Reflected Ripple Current
Inrush Transient
Input Voltage Transient
Undervoltage Lockout
Isolation
Temperature
Protection
Over-voltage lockout
Input-Output
Resistance; input-output
Operating Ambient
Storage
Over-Temperature
Min.
Typ.
Max.
Units
36
48
25
75
0.2
Vdc
‘mA p-p
A2s
100
V
35
34
81
Vdc
Vdc
Vdc
Vdc
Mohm
°C
°C
See note (1)
100mS 10% duty
cycle
Turn-on
(non-latching)Turn-off
(non-latching)Turn-off
(non-latching)Measured on PCB
Physical Information Dimensions
32
31
77
1500
10
-40
-40
90
125
125
°C
2.30”L x 0.82” W x 0.36”H (58.4 x 20.8 x 9.3 mm)
Calculated at 40C ambient, (Bellcore)
1,000,000 Hrs
EHS15/20 Series
Demonstrated at 40C ambient with 90% confidence: 2,800,000 Hrs
Complies with IEC/EN/CSA/UL 60950, provides basic insulation, input to output.
c-UL-us (US and Canada) recognized, TUV certified (Bauart).
MTBF
Safety
Pin Assignments
Pin #
1
2
3
Description
Vin (+)
Enable
Vin(-)
Pin #
4
5
6
Description
Vout(-)
Sense Vo adj
Pin #
7
8
Description
Sense +
Vo (+)
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EHS20-6200981505_D01_28/04/08
E Class Converters
Murata Power Solutions
EHS20 – 1.5V Model
EHS20-015 TEMPERATURE DERATING
Airflow from Vin(-) to Vin(+), Tj=120C
25
20
20
Iout (amps dc)
25
15
10
100 LFM
200 LFM
300 LFM
400 LFM
15
10
5
100 LFM
200 LFM
300 LFM
400 LFM
5
20
30
40
50
60
70
80
Ambient temp (deg c)
90
20
30
14Nov03
40
50
60
70
EHS20-015 Enable
with Pre-Bias
Ambient temp (deg c)
80
90
14Nov03
EHS20-015 Efficiency
90.0
85.0
Efficiency [%]
80.0
36V
48V
75V
75.0
70.0
Output Voltage @ 0.5 V/div., 2 ms/div.
Prebias voltage =0.9 Vdc. Input Voltage 48 V
Load current = 0, Load capacitance = 2,200 uF.
65.0
4
6
8
10
12
14
16
18
20
Iout [Adc]
EHS20-015 Trim-up and Trim-down Resistance
Trim Up/Down Formula : 1.5V model
1000
Rup
5.10 Vnom ( 100
%)
1.225 %
Where
%
( Vout
Vnom) 100
510
10.2
and, Vout = Target output voltage
Vnom
Rdown ( % )
510
Where
10.2 K
%
Rup (1.5 V)
Rdown
K
%
%
Resistance (Kohms)
Iout (amps dc)
EHS20-015 TEMPERATURE DERATING
Airflow from Input to Output, Tj=120C
100
10
( Vnom Vout ) 100
Vnom
1
0%
2%
4%
6%
Delta (%)
8%
10%
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3
EHS20-6200981505_D01_28/04/08
Murata Power Solutions
E Class Converters
EHS20 – 1.5V Model
EHS20-015 Startup Sequence from Enable
EHS20-015 Startup Sequence from Vin
Top Trace: Vout @ 0.5 V/div.
Bot. Trace: Vin @ 20V/div. (48Vdc)
Horiz. @ 50 ms/div.
Load: 20 A,
Turn-on delay: 110mS
Top Trace: Vout @ 0.5 V/div.
Bot. Trace: Venable @ 2 V/div.
Horiz. @ 5 ms/div. Vin= 36Vdc
Load: 20 A., 10,000 uF,
Turn-on delay: 4.8 ms
EHS20-015 Transient Response, 50-25% step, 1A/us
EHS20-015 Transient Response, 50-75% step, 1A/μs
CH1: Vout AC coupled
CH2 : Step up Current (2A/div)
CH1: Vout AC coupled
CH2 : Step down Current (2A/div)
EHS20-015 Input Reflected Ripple Current, Iout = 20 A
EHS20-015 Output Ripple Voltage, Iout = 20A
Input Current @ 5.0 mA/div., 20 us/div. (14 mApp)
Input Voltage: 48 V, Load Current: 20A
Note: refer to test circuit schematic
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EHS20-6200981505_D01_28/04/08
E Class Converters
Murata Power Solutions
EHS20 – 1.5V Model
Notes:
1.
Input Reflected Ripple is specified when measured with the filter shown below
is
ic
L2
Vin
1 2u F
2 2 0 uF ,
E S R < 0.1 O h m s
@ 1 00 k H z
33uF,
E S R < 0 .7 O hm s
@ 1 0 0 kH z
DC-DC
Converter
RTN
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(-).
EHS20-015 Enable Pin Connection Table
NEGATIVE LOGIC VERSION
POSITIVE LOGIC VERSION
Note:
ENABLE POWER SUPPLY
0V < Venable < 0.8V
(internal pull-up > 50Kohms @
5V)
2.5V < Venable < 15V
(external pull-up > 1Kohms)
DISABLE POWER SUPPLY
2.5V < Venable < 15V
(external pull-up > 1Kohms)
0V < Venable < 0.8V
(internal pull-up > 50Kohms @
5V)
Power Supply has internal pull-up resistor. Enable pin is in a valid “high” state if left open-circuit.
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.
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5
EHS20-6200981505_D01_28/04/08
Murata Power Solutions
E Class Converters
EHS20 – 1.5V Model
Part Number Designations
This product is subject to the following operating requirements
and the Life and Safety Critical Application Sales Policy:
Refer to: http://www.murata-ps.com/requirements/
Murata Power Solutions, Inc.
11 Cabot Boulevard, Mansfield, MA 02048-1151 U.S.A.
ISO 9001 and 14001 REGISTERED
Murata Power Solutions, Inc. makes no representation that the use of its products in the circuits described herein, or the use of other
technical information contained herein, will not infringe upon existing or future patent rights. The descriptions contained herein do not imply
the granting of licenses to make, use, or sell equipment constructed in accordance therewith. Specifications are subject to change without
notice.
© 2012 Murata Power Solutions, Inc.
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EHS20-6200981505_D01_28/04/08