Datasheet

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UWS Series
Sixteenth-brick DOSA-Compatible,
Wide Input Isolated DC-DC Converters
MDC_UWS Series.D03 Page 12 of 25
FUNCTIONAL SPECIFICATIONS, UWS-12/4.5-Q48
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous Full temperature range 0 80 Vdc
Input Voltage, Transient
Operating or non-operating, 100 mS max.
duration
0 100 Vdc
Isolation Voltage Input to output tested 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 0 54.54 W
Output Current Current-limited, no damage, short-circuit protected 0 4.5 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 18 48 75 Vdc
Recommended External Fuse Fast blow 6 A
Start-up threshold Rising input voltage 16.5 17.2 17.9 Vdc
Undervoltage lockout Falling input voltage 15 16.5 17.50 Vdc
Overvoltage shutdown Rising input voltage None Vdc
Reverse Polarity Protection None, install external fuse None Vdc
Internal Filter Type capacitive
Input current
Full Load Conditions Vin = nominal 1.24 1.28 A
Low Line Vin = minimum , 3.5A load 2.55 2.63 A
Inrush Transient 0.05 A2-Sec.
Output in Short Circuit 100 200 mA
No Load Input Current Iout = minimum, unit=ON 25 60 mA
Shut-Down Mode Input Currrent (Off, UV, OT) 510mA
Refl ected (back) ripple current
➁
Measured at input with specifi ed fi lter 30 40 mA, pk-pk
Pre-biased startup External output voltage < Vset Monotonic
GENERAL and SAFETY
Effi ciency
Vin=48V, full load 89 91 %
Vin=24V, full load 89.5 91.5 %
Isolation
Isolation Voltage, Input to Output 2250 Vdc
Insulation Safety Rating basic
Isolation Resistance 100 M
Isolation Capacitance 1000 pF
Safety (Designed to meet the following
requirements)
UL-60950-1, IEC/EN60950-1, 2nd Edition Yes
Calculated MTBF
➃
Per Telcordia SR332, issue 1, class 3, ground
fi xed, Tambient=+25°C
3.0 Hours x 10
6
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency 200 230 260 KHz
Power Up Startup Time Power On to Vout regulated 30 mS
On/Off Startup Time Remote ON to Vout regulated 30 mS
Dynamic Load Response
50-75-50% load step, settling time to within
±1% of Vout
250 300 µSec
Dynamic Load Peak Deviation Same as above, ±350 ±400 mV
FEATURES and OPTIONS
Remote On/Off Control ➅
"N" suffi x
Negative Logic, ON state ON=Pin grounded or external voltage -0.1 0.8 Vdc
Negative Logic, OFF state OFF=Pin open or external voltage 2.5 15 Vdc
Control Current Open collector/drain, sourcing 1 2 mA
"P" suffi x
Positive Logic, ON state ON=Pin open or external voltage 10 15 Vdc
Positive Logic, OFF state OFF=Pin grounded or external voltage 0 0.7 Vdc
Control Current Open collector/drain, sinking 1 2 mA