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UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
FUNCTIONAL SPECIFICATIONS – MODEL UEI25-033-D48
ABSOLUTE MAXIMUM RATINGS
Input Voltage, Continuous
Input Voltage, Transient
Conditions ?
Full power operation
Operating or non-operating, 100 mS max.
duration
Minimum
0
0
Typical/Nominal
Maximum
80
100
Units
Vdc
Vdc
Isolation Voltage
Input Reverse Polarity
On/Off Remote Control
Input to output
None, install external fuse
Power on or off, referred to -Vin
2250 Vdc
None Vdc
0 15 Vdc
Output Power
Output Current
Storage Temperature Range
0 25.25 W
Current-limited, no damage, short-circuit protected 0 7.5 A
Vin = Zero (no power) -55 125 ?C
Absolute maximums are stress ratings. Exposure of devices to greater than any of these conditions may adversely affect long-term reliability. Proper operation under conditions other than those
listed in the Performance/Functional Speci?cations Table is not implied or recommended.
INPUT
Operating voltage range
Recommended External Fuse
Fast blow
36
48
75
1.5
Vdc
A
Start-up threshold
Undervoltage shutdown
Rising input voltage
Falling input voltage
34
32
35.2
34.0
36
35.2
Vdc
Vdc
Overvoltage shutdown
None
Vdc
Reverse Polarity Protection
Internal Filter Type
None, install external fuse
None
LC
Vdc
Input current
Full Load Conditions
Low Line
Inrush Transient
Output in Short Circuit
No Load
Standby Mode (Off, UV, OT)
Re?ected (back) ripple current ?
Pre-biased startup
Vin = nominal
Vin = minimum
Iout = minimum, unit=ON
Measured at input with speci?ed ?lter
External output voltage < Vset
0.58
0.79
0.05
50
75
1
30
Monotonic
0.60
0.81
100
100
2
A
A
A2-Sec.
mA
mA
mA
mA, RMS
GENERAL and SAFETY
Ef?ciency
Vin=48V, full load
Vin=36V, full load
87
86.5
89.5
87.5
%
%
Isolation
Isolation Voltage
Insulation Safety Rating
Input to output, continuous
2250
basic
Vdc
Isolation Resistance
Isolation Capacitance
10
1000
Mohm
pF
Safety
Certi?ed to UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd edition
Yes
Calculated MTBF
Calculated MTBF
Per MIL-HDBK-217F, ground benign,
Tambient=+30?C
Per Telcordia SR332, issue 1, class 3, ground
?xed, Tambient=+40°C
TBD
2
Hours x 10 6
Hours x 10 6
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency
Startup Time
Startup Time
Dynamic Load Response
Dynamic load di/dt
Dynamic Load Peak Deviation
Power On to Vout regulated
Remote ON to Vout regulated
50-75-50% load step, settling time to within
±2% of Vout
same as above
300
330
180
±30
360
50
50
250
2
±100
KHz
mS
mS
μSec
A/μSec
mV
FEATURES and OPTIONS
Remote On/Off Control ?
"N" suf?x
Negative Logic, ON state
Negative Logic, OFF state
Control Current
ON = Ground pin or external voltage
OFF = Pin open or external voltage
-0.7
10
1
1.2
15
V
V
mA
"P" suf?x
Positive Logic, ON state
Positive Logic, OFF state
Control Current
ON = Pin open or external voltage
OFF = Ground pin or external voltage
10
-0.7
1
15
1.2
V
V
mA
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