Model
BUS CONVERTER
EUS25-096 Model
PRELIMINARY
Features:
48 Vin, Isolated, 5:1 Fixed Conversion Ratio
240 Watt Nominal Output (at 48 Vin, 55 C, 200 LFM)
Industry Standard 1/8 Brick Footprint
Remote Enable (Primary Side, Positive or Negative)
Over-temperature, Over Current Protections
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, on load (48 Vin)
Disabled state (48 Vin)
Notes & Conditions (1)
Min
36
34
32
2
56
55
2
6.4
50
6
50
0.2
On State range
Off State range
On State range
Off State range
-0.1
2.4
2.4
-0.1
0.8
5.0
5.0
0.8
58
57
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/4 +0/-0.5%)
Output Load Regulation
Output Voltage Total Regulation
Output Ripple Voltage & Noise (2)
Output Current Operating Range
Efficiency
Turn-On Time
Start-up Inhibit Time
Transient Response (3)
Maximium Output Capacitance (4)
Notes & Conditions (1)
Vin = 48.0 V, Io = 0 A
Io = 0 to 25 A
Vin = 36 to 55 V, Io = 0 to 25 A,
Vin = 42 to 53 V, Io = 0 to 25 A,
20 MHz Bandwidth
Vin = 48 V, Io = 25 A
Vin present: Enable to 90% Vout
Enabled: Vin applied to 90% Vout
25% step, 0.1A/µs,
∆Vo
Recovery Time
Min
9.40
6.90
8.20
90
0
94
10
80
160
100
3000
Typ.
9.60
0.7
Max
10.00
11.20
10.8
150
25
Units
Vdc
V
Vdc
Vdc
mV p-p
A
%
mS
mS
mV
µs
µF
Celestica Power Systems
1150 Eglinton Aveune East
Innovative Solutions You Can Count On
4607 S.E. International Way
Milwaukie, Oregon 97222
1-971-206-2800
Page 1
Toronto, Ontario M3C 1H7
1-866-740-1232
EUS25-096 6200551433-A01_Apr12-2004
www.celesticapower.com
Model
BUS CONVERTER
EUS25-096 Model
Table 3
Protection Characteristics
Output Over-Current Shutdown
Short Circuit Current
Over Temperature Shutdown (4)
Over Temperature Restart Hysteresis
Notes & Conditions (1)
Non-Latching
Re-start rate
Peak
Non-Latching
Min
27
Typ.
30
TBD
TBD
125
10
Max
33
Units
A
msec
Ap
°C
°C
130
Table 4
General Specifications
Isolation Voltage
Isolation Resistance
Storage Temperature Range
Operating Temperature Range
Thermal Measurement Location Temperature (6)
Material Flammability
MTBF
Dimension
Weight
Notes & Conditions (1)
Input to Output
Input to Output
Non-condensing
See mechanical drawing for location
UL 94V-0
Calculated (Bellcore TR-332)
Demonstrated
2.28”L x 0.9”W x 0.49”H (max)
(57.9L x 22.9W x 12.45H mm max)
Min
2250
10
-40
-40
Typ.
Max
Units
Vdc
Mohm
°C
°C
°C
x10 Hrs
6
x10 Hrs
6
125
85
130
TBD
TBD
1
grams
Table 5
Standards Compliance
UL/CSA 60950
EN60950
Notes & Conditions (6)
Basic Insulation, (pending)
Certified by TUV (pending)
Notes:
(1)
(2)
(3)
(4)
(5)
(6)
(7)
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 electrolytic and a 1uF ceramic capacitor at the converter
output pins.
Transient response is specified without a capacitor at the output of the converter.
Product works with external capacitance several times higher than specified. However, for values higher than 2000uF please contact
Celestica representative.
Thermal shutdown is monitored at the Thermal Measurement Location (TML). See ‘Mechanical Information’ on page 3 for TML
location.
See ‘Safety Considerations’ shown in Figure 12.
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 (transversal to the unit)
Celestica Power Systems
1150 Eglinton Aveune East
Innovative Solutions You Can Count On
4607 S.E. International Way
Milwaukie, Oregon 97222
1-971-206-2800
Page 2
Toronto, Ontario M3C 1H7
1-866-740-1232
EUS25-096 6200551433-A01_Apr12-2004
www.celesticapower.com
Model
BUS CONVERTER
EUS25-096 Model
Mechanical Information
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 Vo(-).
Positive Logic: Floating = Enabled
Negative Logic: Floating = Disabled
Notes & Conditions
Celestica Power Systems
1150 Eglinton Aveune East
Innovative Solutions You Can Count On
4607 S.E. International Way
Milwaukie, Oregon 97222
1-971-206-2800
Page 3
Toronto, Ontario M3C 1H7
1-866-740-1232
EUS25-096 6200551433-A01_Apr12-2004
www.celesticapower.com
Model
BUS CONVERTER
EUS25-096 Model
Efficiency Curves
EUS25 Efficiency (%) vs Iout (A)
98
97
96
95
Efficiency [%]
94
93
92
91
90
89
88
0
2
4
6
8
10
12
14
Iout [Adc]
16
18
20
22
24
26
28
Vin=36V
Vin=48V
Vin=55V
Figure 2
Output Voltage vs. Current
EUS25-096 Output vs. Current
11.0
10.5
10.0
9.5
9.0
Vout
[V]
8.5
8.0
7.5
7.0
6.5
6.0
0
2
4
6
8
10
12
14
Iout [Adc]
16
18
20
22
24
26
28
Vin=36V
Vin=48V
Vin=55V
Celestica Power Systems
1150 Eglinton Aveune East
Innovative Solutions You Can Count On
4607 S.E. International Way
Milwaukie, Oregon 97222
1-971-206-2800
Page 4
Toronto, Ontario M3C 1H7
1-866-740-1232
EUS25-096 6200551433-A01_Apr12-2004
www.celesticapower.com
Model
BUS CONVERTER
EUS25-096 Model
Thermal Derating Curves (Transverse) Tcase=120C
EUS25-096 Thermal Derating
Airflow from Vin to Vo Tj = 120ºC, Vin = 38V
27
24
21
18
15
12
9
6
3
0
25
35
45
55
65
75
85
95
Ambient Temperature [ºC]
100 LFM
200 LFM
300 LFM
400 LFM
Output Current
[A]
EUS25-096 Thermal Derating
Airflow from Vin to Vo Tj = 120ºC, Vin = 48V
27
24
21
18
15
12
9
6
3
0
25
35
45
55
65
75
85
95
Ambient Temperature [ºC]
100 LFM
200 LFM
300 LFM
400 LFM
Celestica Power Systems
1150 Eglinton Aveune East
Output Current
[A]
Innovative Solutions You Can Count On
4607 S.E. International Way
Milwaukie, Oregon 97222
1-971-206-2800
Page 5
Toronto, Ontario M3C 1H7
1-866-740-1232
EUS25-096 6200551433-A01_Apr12-2004
www.celesticapower.com
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