EHS20 – 1.8V Model
Model
Parameter
Output Voltage Setpoint
Line/Load Regulation
Output total regulation
Output adjust (note 4)
Remote-sense Comp.
Output Ripple & Noise (note 2)
Output Current
Efficiency (48V, Full load, 25C)
External Capacitance
Transient Response (typ) (3)
25% step, 1A/µs
Over-voltage trip point (latching)
Over-current trip point (non-latching)
Typ
∆Vo
Ts
Typ
Max
Max
1.8V
1.78 – 1.82
0.1% / 0.2%
1.75 – 1.85
90-110
10%
100
0 - 20
87%
1,000-10,000
165
400
2.1 – 2.6
25
Units
Vdc
% Vo
Vdc
%Vo,nom
V
mVp-p
A
%
µF
mV
µs
V
A
All specifications, waveforms, charts at Ta=25C, Vin=48V, unless otherwise specified
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EHS20 – 1.8V Model
Parameter
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
Over-Temperature
Conditions
See note (1)
100mS 10% duty
cycle
Turn-on
(non-latching)Turn-off
(non-latching)Turn-off
Min.
36
Typ.
48
25
Max.
75
0.2
100
32
31
77
1500
10
-40
-40
125
35
34
81
Units
Vdc
‘mA p-p
A
2
s
V
Vdc
Vdc
Vdc
Vdc
Mohm
°C
°C
°C
Isolation
Temperature
Protection
90
125
(non-latching)Measured on PCB
Physical Information Dimensions
MTBF(Bellcore)
Safety
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).
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 – 1.8V Model
EHS20-018 Thermal Derating
Airflow from Vo(-) to Vo(+), Tj= 120ºC
25
EHS20-018 Thermal Derating
Airflow from Vin to Vo, Tj = 120ºC
25
20
20
Output Current [A]
Output Current [A]
400 LFM
15
300 LFM
400 LFM
15
300 LFM
200 LFM
200 LFM
10
100 LFM
10
100 LFM
5
20
30
40
50
60
70
80
Q3 17OCt03
5
90
20
30
40
50
60
70
80
Q3 17Oct03
90
Ambient Temperature [ºC]
Ambient Temperature [ºC]
EHS20-018 Efficiency
90
EHS20-018 Enable with Pre-Bias
88
Efficiency (%)
86
84
82
48 V
80
5
10
36 V
75 V
15
Q3 21Oct03
20
Output Current (A)
Output Voltage @ 0.5 V/div., 2 ms/div.
Prebias voltage = 1.2 Vdc. Input Voltage 48 V
Load current = 0, Load capacitance = 2,200 uF.
Trim Up/Down Formula : 1.8V model
5.10
.
Vnom
.
( 100
∆
% )
1.225
. ∆
%
∆
%
( Vout
Vnom)
.
100
Vnom
510
∆
%
Where
10.2 KΩ
∆
%
( Vnom Vout )
.
100
Vnom
510
∆
%
EHS20-018 Trim-up and Trim-down Resistance
1000
Rup
Where
10.2
KΩ
Resistance (Kohms)
Rup (1.8 V)
Rdown
and, Vout = Target output voltage
100
Rdown(
∆
% )
10
0%
2%
4%
6%
Delta (%)
8%
10%
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EHS20 – 1.8V Model
EHS20-018 Startup Sequence from Vin
EHS20-018 Startup Sequence from Enable
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
EHS20-018 Transient Response, 50-75% step 1A/µs
EHS20-018 Transient Response, 50- 25% step 1A/µs
∆
Vo = 73.4 mV
∆
Vo = 68.8 mV
EHS20-018 Output Ripple Voltage, Io=20A
EHS20-018 Input Reflected Ripple, Io=20A
Input Current @ 5 mA/div., 20 us/div. (9.4 mApp)
Input Voltage: 48 Vdc, Load Current: 20 A
Note: see test circuit on following page.
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EHS20 – 1.8V Model
Notes:
1.
Input Reflected Ripple is specified when measured with the filter shown below
i
s
L2
i
c
Vin
12uF
220uF,
ESR<0.1 Ohms
@ 100kHz
33uF,
ESR<0.7 Ohms
@ 100kHz
DC-DC
Converter
RTN
2.
3.
4.
Output Ripple and noise is specified when measured with a 10uF tantalum and a 1uF ceramic
capacitor at the converter output pins
Transient response is specified with a 470uF tantalum capacitor at the output of the converter
Trim resistor connection: Rtrim-up connected from Vo adj to Vo(+), Rtrim –down connected from
Vo adj to Vo(-).
EHS20-018 Enable Pin Connection Table
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)
NEGATIVE LOGIC VERSION
POSITIVE LOGIC VERSION
Note:
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.
4118 14
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Avenue, Unit 4
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