Datasheet

UEI25 Series
Single Output Isolated 25-Watt DC/DC Converters
MDC_UEI25W.B09 Page 7 of 24
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FUNCTIONAL SPECIFICATIONS – MODEL UEI25-120-D48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous Full power operation 0 80 Vdc
Input Voltage, Transient
Operating or non-operating, 100 mS max.
duration
0 100 Vdc
Isolation Voltage Input to output 2250 Vdc
Input Reverse Polarity None, install external fuse None Vdc
On/Off Remote Control Power on or off, referred to -Vin 0 15 Vdc
Output Power 025W
Output Current Current-limited, no damage, short-circuit protected 0 2.1 A
Storage Temperature Range 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 Specifi cations Table is not implied or recommended.
INPUT
Operating voltage range 36 48 75 Vdc
Recommended External Fuse Fast blow 1.5 A
Start-up threshold Rising input voltage 34 35.2 36 Vdc
Undervoltage shutdown Falling input voltage 32 34.0 35.2 Vdc
Overvoltage shutdown None Vdc
Reverse Polarity Protection None, install external fuse None Vdc
Internal Filter Type capacitive
Input current
Full Load Conditions Vin = nominal 0.600 0.617 A
Low Line Vin = minimum 0.809 0.842 A
Inrush Transient 0.05 A2-Sec.
Output in Short Circuit 50 100 mA
No Load Iout = minimum, unit=ON 20 35 mA
Standby Mode (Off, UV, OT) 12mA
Refl ected (back) ripple current
➁
Measured at input with specifi ed fi lter 30 mA, RMS
Pre-biased startup External output voltage < Vset Monotonic
GENERAL and SAFETY
Effi ciency Vin=48V, full load 86.0 87.5 %
Isolation
Isolation Voltage Input to output, continuous 2250 Vdc
Insulation Safety Rating basic
Isolation Resistance 10 Mohm
Isolation Capacitance 1700 pF
Safety
Certifi ed to UL-60950-1, CSA-C22.2 No.60950-
1, IEC/EN60950-1
Yes
Calculated MTBF
Per MIL-HDBK-217F, ground benign,
Tambient=+30˚C
TBD Hours x 10
6
Calculated MTBF
Per Telcordia SR332, issue 1, class 3, ground
fi xed, Tambient=+40°C
2 Hours x 10
6
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency 295 325 355 KHz
Startup Time Power On to Vout regulated 10 50 mS
Startup Time Remote ON to Vout regulated 10 50 mS
Dynamic Load Response
50-75-50% load step, settling time to within
±1% of Vout
100 200 µSec
Dynamic load di/dt 1 A/µSec
Dynamic Load Peak Deviation same as above ±250 ±350 mV
FEATURES and OPTIONS
Remote On/Off Control ➃
"N" suffi x
Negative Logic, ON state ON = Ground pin or external voltage -0.7 0.7 V
Negative Logic, OFF state OFF = Pin open or external voltage 10 15 V
Control Current 1mA
"P" suffi x
Positive Logic, ON state ON = Pin open or external voltage 10 15 V
Positive Logic, OFF state OFF = Ground pin or external voltage -0.7 0.8 V
Control Current 1mA