Bus Converter
EUS20-120 Model
Features:
48 Vin, Isolated, 4:1 Fixed Conversion Ratio
250 Watt Output at 48 Vin, 55 C, 200 LFM
200 Watt Output at 38 Vin, 55 C, 200 LFM
Industry Standard 1/8 Brick Footprint
Remote Enable (Primary Side, Positive or Negative)
Over-temperature and Over Current Protection
Direct Parallel Operation for Higher Power
RoHS Compliant
Table 1
Input Characteristics
Input Voltage Operating Range
Input Voltage Absolute Maximum
Input Undervoltage Lockout
Notes & Conditions
Min
36
36
34
2
55
56
2
6.4
98
6
25
0.2
-0.1
2.4
2.4
-0.1
Table 2
Output Characteristics
Output Voltage Set Point (Vo=Vin/4 +0/-0.5%)
Output Load Regulation
Output Voltage Total Regulation
Output Ripple Voltage & Noise
Output Current Operating Range
Output Current Share Accuracy
Efficiency
Turn-On Time
Start-up Inhibit Time
Transient Response
Maximum Output Capacitance
Notes & Conditions
Vin = 48.0 V, Io = 0 A
Io = 0 to 20 A
Vin = 36 to 55 V, Io = 0 to 20 A,
Vin = 42 to 53 V, Io = 0 to 23 A,
20 MHz Bandwidth
0
Percent deviation from ideal (9)
Vin = 48 V, Io = 20 A
Vin present: Enable to 90% Vout
Enabled: Vin applied to 90% Vout
25% step, 0.1A/μs,
ΔVo
Recovery Time
< 10
95.5
10
80
160
100
2000
Min
11.94
8.3
9.7
90
Typ.
11.98
0.7
Max
12.0
13.75
13.25
150
20
Units
Vdc
V
Vdc
Vdc
mV
p-p
A
%
%
mS
mS
mV
μs
μF
0.8
5.0
5.0
0.8
57
58
Typ.
48
Max
55
60
37.5
35.5
Units
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Vdc
Adc
mA
mA
mA p-p
2
As
Vdc
Vdc
Vdc
Vdc
Input Overvoltage Lockout
Maximum Input Current
No-Load Input Current
Disabled Input Current
Input Reflected Ripple Current
Inrush Current Transient
Enable – Negative Logic Version
Internal 10 K pull-up to 5 V.
Enable – Positive Logic Version
Internal 100 K pull-down to GND.
Turn-on Threshold
Turn-off Threshold
Hysteresis Voltage
Turn-on Threshold
Turn-off Threshold
Hysteresis Voltage
Steady-State (26 A out)
Enabled state, no load (48 Vin)
Disabled state (48 Vin)
Note (10)
On State range
Off State range
On State range
Off State range
Technical enquiries email: sales@murata-ps.com tel: +508 339 3000
,
1
EUS20-120-6200921520.B01 18/04/08
Murata Power Solutions
BUS CONVERTER
EUS20-120 Model
Table 1
Protection Characteristics
Output Over-Current Shutdown
Over Temperature Shutdown (5)
Over Temperature Restart Hysteresis
Notes & Conditions 0
Non-Latching
Re-start rate
Non-Latching
Min
24
Typ.
25
75
125
10
Max
27
130
Units
A
msec
°C
°C
Table 2
General Specifications
Isolation Voltage
Isolation Resistance
Storage Temperature Range
Operating Temperature Range
Thermal Measurement Location Temperature (7)
Material Flammability
MTBF
Notes & Conditions 0
Input to Output
Input to Output
Non-condensing
Ambient (7)
See mechanical drawing for location
UL 94V-0
Calculated (Bellcore TR-332)
Demonstrated
2.28”L x 0.9”W x 0.48”H (max)
(57.9L x 22.9W x 12.19H mm max)
Min
2250
10
-40
-40
Typ.
Max
Units
Vdc
Mohm
°C
°C
°C
x10 Hrs
6
x10 Hrs
6
125
100
120
2.7
2
Dimension
Weight
30
grams
Table 3
Standards Compliance
UL/CSA 60950
EN60950
Notes & Conditions (6)
Basic Insulation
Certified by TUV
Notes:
Vin = 48Vdc, Ta = 25 °C, Airflow = 200 LFM for all data unless otherwise noted.
Output ripple voltage and noise is specified when measured with a 10uF tantalum and a 1uF ceramic capacitor at the converter output pins.
Transient response is specified without a capacitor at the output of the converter.
Product operates with an external capacitance significantly greater than specified. However, for values higher than 2000uF please contact
C&D representative.
Thermal shutdown is monitored at the Thermal Measurement Location (TML). See ‘Mechanical Information’ on page 3 for TML location.
See ‘Safety Considerations’ shown on last page.
De-rating curves are conducted in a controlled environment. End application testing is required to ensure the Thermal Measurement
Location temperature is below the maximum specified.
Recommended airflow direction is from pin 1 to pin 3, or 3 to 1 (transverse airflow).
Current share accuracy is optimized when the source and load impedance presented to each converter is equal.
Input Reflected Ripple is specified when measured with a 12uH source inductance.
EUS20-120-6200921520.B01 18/04/08
2
Murata Power Solutions
Mechanical Information
BUS CONVERTER
EUS20-120 Model
Figure 1
Pin Assignment
Table 4
Pin #
1
2
3
4
5
Pin Name
Vi(+)
En
Vi(-)
Vo(-)
Vo(+)
Function
Positive Input Voltage
Input Enable / Disable
Negative Input Voltage
Negative Output Voltage
Positive Output Voltage
Referenced to Vi(-).
Positive Logic: Floating = Enabled
Negative Logic: Floating = Disabled
Notes & Conditions
EUS20-120-6200921520.B01 18/04/08
3
Murata Power Solutions
BUS CONVERTER
EUS20-120 Model
Efficiency Curves
Efficiency (%) vs. Iout (A) and Vin (V)
97%
96%
95%
94%
93%
92%
91%
90%
2
4
6
8
10
12
14
16
18
20
22
24
55Vin
48Vin
42Vin
38Vin
Output Voltage vs. Current
Vo (V) vs. Io (A) and Vin (V)
14
13
12
11
10
9
55 Vin
8
7
6
0
2
4
6
8
10
12
14
16
18
20
22
24
48 Vin
42 Vin
38 Vin
EUS20-120-6200921520.B01 18/04/08
4
Murata Power Solutions
BUS CONVERTER
EUS20-120 Model
Airflow from pin 3 to pin 1
Iout (A) vs. Tamb (C) and Air Flow (LFM) at 42 Vin
Thermal Derating Curves (Transverse) T
TML
=120C
Iout (A) vs. Tamb (C) and Air Flow (LFM) at 38 Vin
24
22
20
18
16
14
12
10
8
6
4
2
0
25
100 LFM
200 LFM
300 LFM
400 LFM
24
22
20
18
16
14
12
10
8
6
4
2
0
45
55
65
75
85
25
100 LFM
200 LFM
300 LFM
400 LFM
35
35
45
55
65
75
85
Iout (A) vs. Tamb (C) and Air Flow (LFM) at 48 Vin
24
22
20
18
16
14
12
10
8
6
4
2
0
25
35
45
55
65
75
85
400 LFM
100 LFM
200 LFM
300 LFM
Iout (A) vs. Tamb (C) and Air Flow (LFM) at 55 Vin
24
22
20
18
16
14
12
10
8
6
4
2
0
25
35
45
55
65
75
85
100 LFM
200 LFM
300 LFM
400 LFM
Output Power Curves at 200 LFM
as a function of Ambient Temperature and Vin
350
300
250
200
150
100
50
25
30
35
40
45
50
55
60
65
70
75
80
85
Vin = 38 VDC
Vin = 42 VDC
Vin = 48 VDC
Vin = 55 VDC
Ambient Temperature
EUS20-120-6200921520.B01 18/04/08
5
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