Datasheet

www.murata-ps.com/support
ULT Series
Thirty-Second-Brick Isolated DC/DC Converters
with 2:1 Wide Input Range
MDC_ULT Series.F05 Page 3 of 26
FUNCTIONAL SPECIFICATIONS (ULT-3.3/7.5-D48-C)
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous Full temperature range 36 80 Vdc
Input Voltage, Transient
15
Operating or non-operating, 100 mS max.
duration
100 Vdc
Isolation Voltage Input to output tested 1500 Vdc
Input Reverse Polarity None, install external fuse none Vdc
On/Off Remote Control Power on or off, referred to -Vin 15 Vdc
Output Power 25 W
Output Current Current-limited, no damage, short-circuit protected 7.5 A
Storage Temperature Range Vin = Zero (no power) -40 125 °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
Conditions ➀ ➂
Operating voltage range 36 48 75 Vdc
Recommended External Fuse
13
Fast blow 2 A
Start-up threshold Rising input voltage 32.5 33.3 34.5 Vdc
Undervoltage lockout (@ ½ load)
11
Falling input voltage 30.75 31.75 32.75 Vdc
Turn-On/Turn-Off Hysteresis 1.22 1.3 1.32 Vdc
Overvoltage shutdown Rising input voltage N/A Vdc
Reverse Polarity Protection None, install external fuse None Vdc
Internal Filter Type Capacitive
Input current
Full Load Current Conditions Vin = nominal 0.6 0.62 A
Low Line Input Currrent Vin = minimum 0.8 0.83 A
Inrush Transient Vin = 48V 0.05 A2-Sec.
Short Circuit input current 0.04 0.1 mA
No Load input current Iout = minimum, unit=ON 20 40 mA
Shut-Down Mode input current (Off, UV, OT) 610mA
Refl ected (back) ripple current
➁
Measured at input with specifi ed fi lter 30 mA, pk-pk
GENERAL and SAFETY
Effi ciency
Vin=48V 84 85.5 %
Vin=36V 83.5 85.5 %
Isolation
Isolation Voltage, Input to Output 1500 Vdc
Insulation Safety Rating basic
Isolation Resistance 10 M
Isolation Capacitance 1700 pF
Safety
(certifi ed to the following requirements)
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/60950-1, 2nd edition
Yes
Calculated MTBF ➃
Per Telcordia SR332, issue 1, class 3, ground
fi xed, Tambient=+25°C
TBD Hours x 10
3
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency 250 287 320 KHz
Startup Time Power On, to Vout regulation band, 100% 50 mS
Startup Time Remote ON to Vout Regulated 50 mS
Dynamic Load Response 50-75-50% load step to 1% of Vout 75 150 µSec
Dynamic Load Peak Deviation same as above ±100 mV
FEATURES and OPTIONS
Remote On/Off Control ➅
"N" suffi x
Negative Logic, ON state ON = pin grounded or external voltage -0.7 1.0 Vdc
Negative Logic, OFF state OFF = pin open or external voltage 10 15 Vdc
Control Current open collector/drain 1 mA
"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 1.0 V
Control Current open collector/drain 1 mA