Datasheet

EMH-54/3-Q48N-C Series
Isolated, 54Vout, 3A, Ethernet Power
Half-Brick DC/DC Converters
MDC_EMH-54/3-Q48N-C.A05 Page 3 of 15
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FUNCTIONAL SPECIFICATIONS
ABSOLUTE MAXIMUM RATINGS
Conditions ➀
Minimum Typical/Nominal Maximum Units
Input Voltage, Continuous Full power operation 0 72 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 0 164.32 W
Output Current
Current-limited, no damage,
short-circuit protected
0.2 3 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 nor recommended.
INPUT
Operating voltage range ➁
18 48 72 Vdc
Turn On/Start-up threshold Rising input voltage 16.5 17.5 18 Vdc
Ambient temperature > 60°C 19 Vdc
Turn Off/Undervoltage lockout Tested at 2.6A 15 17 17.5 Vdc
Turn-On/Turn-Off Hysteresis 1.0 1.05 1.2 Vdc
Reverse Polarity Protection None, install external fuse None Vdc
Recommended External Fuse Fast blow 20 A
Internal Filter Type L-C
Input current
Full Load Conditions Vin = nominal 3.67 3.83 A
Low line input current Vin @ Min. @2.6A 8.52 8.84 A
Inrush Transient 0.1 A
2
-Sec.
Short Circuit Input Current 250 350 mA
No Load Input Current Iout = minimum, unit=ON 40 80 mA
Shutdown Mode Input Current (Off, UV, OT) 510mA
Refl ected (back) ripple current ➂
Measured at input with specifi ed fi lter 40 80 mA, p-p
GENERAL and SAFETY
Effi ciency Vin = 48V, full load 89.5 91.5 %
Vin = 24V, full load 89.5 91.5 %
Vin = 18V, full load 89.5 91 %
Isolation
Isolation Voltage: no baseplate Input to output, continuous 2250 Vdc
Isolation Voltage: with baseplate
Input to output, continuous 2250 Vdc
Input to Baseplate, continuous 1500
Output to Baseplate, continuous 750
Insulation Safety Rating basic
Isolation Resistance 100 Mohm
Isolation Capacitance 5,000 pF
Safety (Designed to meet the following
requirements)
UL-60950-1, CSA-C22.2 No.60950-1,
IEC/EN60950-1, 2nd Edition
Yes
Calculated MTBF
Per Telcordia SR332, issue 1 class 3, ground
fi xed, Tambient=+25°C
1.8+ Hours x 10
6
DYNAMIC CHARACTERISTICS
Fixed Switching Frequency 387 430 473 KHz
Startup Time
Power On to Vout regulated 10-90%
(50% resistive load)
40 60 mS
Startup Time Remote ON to 10% Vout (50% resistive load) 30 50 mS
Dynamic Load Response
50-75-50% load step, settling time to within
±2% of Vout
300 450 µSec
Dynamic Load Peak Deviation same as above ±1000 ±1250 mV
FEATURES and OPTIONS
Remote On/Off Control ➃
“N” suffi x:
Negative Logic, ON state ON = Pin grounded or external voltage -0.7 0.8 V
Negative Logic, OFF state OFF = Pin open or external voltage 5 15 V
Control Current open collector/drain 1 2 mA
Base Plate “B” suffi x