BUS CONVERTER
EUS25-096 Model
Features:
48 Vin, Isolated, 5:1 Fixed Conversion Ratio
240 Watt Output at 48 Vin, 55 C, 200 LFM
175 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
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 (9)
On State range
Off State range
On State range
Off State range
Notes & Conditions
Min
36
34
32
2
55
56
2
6.4
50
6
50
0.2
-0.1
2.4
2.4
-0.1
0.8
5.0
5.0
0.8
58
59
Typ.
48
Max
55
60
36
35
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.
Table 2
Output Characteristics
Output Voltage Set Point (Vo=Vin/5 +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 25 A
Vin = 38 to 55 V, Io = 0 to 25 A,
Vin = 42 to 53 V, Io = 0 to 25 A,
20 MHz Bandwidth
Percent deviation from ideal (8)
Vin = 48 V, Io = 25 A
Vin present: Enable to 90% Vout
Enabled: Vin applied to 90% Vout
25% step, 0.1A/μs,
ΔVo
Recovery Time
Min
9.40
6.60
7.80
90
0
< 10
95
10
120
160
100
3000
Typ.
9.60
0.5
Max
9.80
11.20
10.7
150
25
Units
Vdc
V
Vdc
Vdc
mV p-p
A
%
%
mS
mS
mV
μs
μF
Technical enquiries email: sales@murata-ps.com tel: +508 339 3000
,
1
EUS25-096 6200911514_B01 18/04/08
Murata Power Solutions
Table 3
Protection Characteristics
Output Over-Current Shutdown
Over Temperature Shutdown
Over Temperature Restart Hysteresis
Table 4
General Specifications
Isolation Voltage
Isolation Resistance
Storage Temperature Range
Operating Temperature Range
Thermal Measurement Location Temperature
Material Flammability
MTBF
Notes & Conditions
Input to Output
Input to Output
Non-condensing
Ambient
See mechanical drawing for TML 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)
Notes & Conditions
Non-Latching
Re-start rate
Non-Latching
BUS CONVERTER
EUS25-096 Model
Min
27
Typ.
30
60
125
10
Max
33
130
Units
A
msec
°C
°C
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
Table 5
Standards Compliance
UL/CSA 60950
EN60950
30
grams
Notes & Conditions (6)
Basic Insulation
Certified by TUV
Notes:
(1)
(2)
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.
(3)
(4)
Transient response is specified without a capacitor at the output of the converter.
Thermal shutdown is monitored at the Thermal Measurement Location (TML). See ‘Mechanical Information’ on page 3 for TML
location.
(5)
(6)
See ‘Safety Considerations’ shown in Figure 1.
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.
(7)
(8)
(9)
Recommended airflow direction is from pin 1 to pin 3, or 3 to 1 (transverse).
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. Without an input filter inductor, input ripple is less
than 1 Arms for an input filter capacitance rated 70 mohms esr
2
EUS25-096 6200911514_B01_18/04/08
Murata Power Solutions
Mechanical Information
BUS CONVERTER
EUS25-096 Model
Figure 1
Pin Assignment
Table 6
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
3
EUS25-096 6200911514_B01_18/04/08
Murata Power Solutions
BUS CONVERTER
EUS25-096 Model
Efficiency Curves
EUS25 Efficiency (%) vs Iout (A)
98
97
96
95
Efficiency [%]
94
93
92
91
90
Vin=36V
Vin=48V
Vin=55V
89
88
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
Iout [Adc]
Figure 2
Output Voltage vs. Current
EUS25-096 Output vs. Current
11.0
10.5
10.0
9.5
9.0
8.5
8.0
7.5
7.0
6.5
6.0
0
2
4
6
8
10
12
14
16
18
20
22
24
26
28
Vout [V]
Vin=36V
Vin=48V
Vin=55V
Iout [Adc]
Figure 3
4
EUS25-096 6200911514_B01_18/04/08
Murata Power Solutions
BUS CONVERTER
EUS25-096 Model
Power Derating Curves, T
TML
=120C
EUS25-096_Pout(W) vs. Tam b(C) and Airflow
38Vin, 120C, Parallel Airflow (IN to Out)
200
180
160
140
120
100
80
60
40
20
0
40
45
220
200
180
160
140
120
100
80
60
40
20
0
EUS25-096_Pout(W) vs. Tam b(C) and Airflow
42Vin, 120C, Parallel Airflow (IN to Out)
400 LFM
300 LFM
200 LFM
100 LFM
50
55
60
65
70
75
80
85
90
400 LFM
300 LFM
200 LFM
100 LFM
40
45
50
55
60
65
70
75
80
85
90
Figure 4
Figure 5
EUS25-096_Pout(W) vs. Tam b(C) and Airflow
48Vin, 120C, Parallel Airflow (IN to Out)
240
220
200
180
160
140
120
100
80
60
40
20
0
40
45
Figure 6
EUS25-096_Pout(W) vs. Tam b(C) and Airflow
55Vin, 120C, Parallel Airflow (IN to Out)
280
260
240
220
200
180
160
140
120
100
80
60
40
20
0
85
90
40
45
Figure 7
400 LFM
300 LFM
200 LFM
100 LFM
50
55
60
65
70
75
80
400 LFM
300 LFM
200 LFM
100 LFM
50
55
60
65
70
75
80
85
90
Output Power as a function of Ambient Temperature and Input Voltage
EUS25-096_Pout(W) vs. Tam b(C) and Vin (V).
200 LFM, 120C, Parallel Airflow (IN to Out)
275
250
225
200
175
150
125
100
75
50
25
0
40
45
Figure 8
Vin = 55V
Vin = 48V
Vin = 42V
Vin = 38V
50
55
60
65
70
75
80
85
90
5
EUS25-096 6200911514_B01_18/04/08
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