LM721A
Serial Service Manual Rev: A
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4.3 Power Supply Requirements
4.3.1 Input Requirements
PARAMETER RANGE
CONDITION
Input AC Voltage 100 to 240VAC RMS
Universal input full range
Input Frequency 60Hz @ 100VAC to 50Hz @
240VAC
Input Current
Less than 2.0 Amps RMS
Input voltage 100 VAC RMS ; 60 Hertz. Parameter
must be reached within 3 seconds of turn-on.
Less than 1.0 Amps RMS
Input voltage 220 VAC RMS ; 50 Hertz. Parameter
must be reached within 3 seconds of turn-on.
Input Power
Less than 75 Watts
Power factor > 0.5 Input voltage 120 VAC RMS ; 60
Hertz
Inrush Current
Less than 30 A peak
Input voltage 100 VAC RMS ; 60 Hertz at all
Phase(0, 90, 180, 270 degree)
Less than 50 A peak
Input voltage 240 VAC RMS ; 50 Hertz at all
Phase(0, 90, 180, 270 degree)
Input Fusing
Fuse should be located internal to the
adapter, easily accessible when the
cover is removed
Fuse must be UL/CSA approved. Fuse value must no
have to change for 115 VAC or 230 VAC operation
Leakage Current
Less than 3.5 mA
Input voltage 240 Volts RMS ; 50 Hertz
Hi-Pot
Primary to secondary
1.5KVAC for 1 Minute(leakage current 10mA)
1.8KVAC for 1 Minute(leakage current 10mA)
3.0KVAC for 1 Minute(leakage current 10mA)
without Y-cap & Coupling cap.
Prima1ry to Safety Ground
1.5KVAC for 1 Minute(leakage current 10mA)
1.8KVAC for 1 Minute(leakage current 10mA)
4.3.2 Output Requirements
PARAMETER RANGE
CONDITION
DC Out
12VDC ± 5%
Min 0A Max 3.75A
Load Regulation
12.0V(12.12V) ± 5%
11.4 to 12.6VDC
Dynamic Load
Regulation
Any frequency up to 250Hz(duty
50%)
±
5% for 10% to 100%, 100% to 10% load change
for
+12Vdc
Ripple & noise
170mVpp at 12VDC
Input voltage : 100VAC at 60Hz 240VAC at 50Hz
* Ripple and noise are measured.
Output current
protection
less than 7.0A, more than 12.0A
at 12.0VDC
Current exceeds maximum rateing more than 20%
Leakage Current
Less than 0.25 mA
Input voltage 100 Volts RMS ; 50 Hertz
Less than 0.5 mA
Input voltage 240 Volts RMS ; 50 Hertz
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