LM721A SerialServiceManual 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
