Click Here to download this file: http://www.murata-ps.com/data/power/cps/cdc_ehs20-025.pdf

E Class Converters
EHS20 – 2.5V Model
OBSOLETE PRODUCT
Model
Parameter
2.5V
Output Voltage Setpoint
Line/Load Regulation
Max
Output total regulation
Output adjust (note 4)
Remote-sense Comp.
Output Ripple & Noise (note 2)
Max
Output Current
Efficiency (48V, Full load, 25C)
Typ
External Capacitance
Transient Response (typ) (note 3)
25% step, 1A/μs
2.47 – 2.52
Vdc
0.1% / 0.2%
% Vo
2.43 – 2.57
Vdc
90-110
%Vo,no
m
10%
V
100
mVp-p
0-20
A
88%
%
1,000-10,000
μF
ΔVo
165
mV
Ts
400
μs
3.0 – 3.5
V
25
A
Over-voltage trip point (latching)
Over-current trip point (non-latching)
Units
Typ
All specifications, waveforms, charts at Ta=25C, Vin=48V, unless otherwise specified
For full details go to
www.murata-ps.com/rohs
www.murata-ps.com/support
Technical enquiries email: [email protected], tel: +508 339 3000
1
EHS20-6200961507_D01_28/04/08
E Class Converters
EHS20 – 2.5V Model
Parameter
Conditions
Input
Input Voltage (Vin)
Reflected Ripple Current
Inrush Transient
Input Voltage Transient
Undervoltage Lockout
Over-voltage lockout
Input-Output
Resistance; input-output
Operating Ambient
Storage
Isolation
Temperature
Protection
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
130
°C
2.30”L x 0.82” W x 0.37”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 (+)
www.murata-ps.com/support
2
EHS20-6200961507_D01_28/04/08
E Class Converters
EHS20 – 2.5V Model
EHS20-025 AIRFLOW DERATING
Airflow from Vin to Vo Tj=120C
25
25
20
20
15
Iout (amps dc)
Iout (amps dc)
EHS20-025 AIRFLOW DERATING
Air flow from Vo(+) to Vo(-) Tj=120C
100 LFM
200 LFM
10
15
100 LFM
200 LFM
10
300 LFM
300 LFM
5
5
400 LFM
400 LFM
0
20
30
40
50
60
70
Ambient temp (deg c)
80
0
90
20
30
40
50
60
Ambient temp (deg c)
EHS20-025.Q4.16OCT03
70
80
90
EHS20-025.Q4.16OCT03
EHS20-025 Enable with Pre-Bias
EHS20-025 Efficiency
91
Efficiency (%)
89
87
85
83
81
36 Vin
75 Vin
48 Vin
79
77
Q4.3.9.29
75
5
10
15
Output Voltage @ 0.5 V/div., 2 ms/div.
Load Current = 0. Load capacitance = 10,000 uF
20
Output Current
EHS20-025 Trim-up and Trim-down Resistance
1000
Trim Up/Down Formula : 2.5V model
5.10 Vnom ( 100
%)
1.225 %
510
10.2
K
%
Resistance (Kohms)
Rup
Rup (2.5 V)
Rdown
100
Where
%
( Vout
Vnom) 100
and, Vout = Target output voltage
Vnom
Rdown ( % )
510
Where
10.2 K
%
%
( Vnom Vout ) 100
Vnom
10
0%
2%
4%
6%
Delta (%)
8%
10%
www.murata-ps.com/support
3
EHS20-6200961507_D01_28/04/08
E Class Converters
EHS20 – 2.5V Model
EHS20-025 Startup Sequence from Vin
EHS20-025 Startup Sequence from Enable
Top Trace: Vout @ 1.0 V/div.
Bot. Trace: Vin @ 20V/div. (48Vdc)
Horiz. @ 50 ms/div.
Top Trace: Vout @ 1.0 V/div.
Bot. Trace: Venable @ 2 V/div.
Horiz. @ 5 ms/div.
EHS20-025 Transient Response 50- 25% step, 1A/μs
EHS20-025 Transient Response 50-75% step ,1A/μs
CH1: Vout AC coupled
CH2 : Step up Current
CH1: Vout AC coupled
CH2 : Step down Current
Load: 20 A, 0 uF, Turn-on delay: 110mS
Load: 20 A. Vin: 48 V, 0 uF, Turn-on delay: 4.8 ms
Input Current @ 5.0 mA/div., 20 us/div. (14 mApp)
Input Voltage: 48 V, Load Current: 20A
Note: refer to test circuit schematic
EHS20-025 Output Ripple Voltage, Io=20A
EHS20-025 Input Reflected Ripple
www.murata-ps.com/support
4
EHS20-6200961507_D01_28/04/08
E Class Converters
EHS20 – 2.5V 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 Enable Pin Connection Table
NEGATIVE LOGIC VERSION
POSITIVE LOGIC VERSION
Note:
ENABLE POWER SUPPLY
OV < 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)
OV < 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.
www.murata-ps.com/support
5
EHS20-6200961507_D01_28/04/08
E Class Converters
EHS20 – 2.5V 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.
www.murata-ps.com/support
6
EHS20-6200961507_D01_28/04/08