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12
KX-NCP1172XJ
5.2.3.
Power Supply Circuit
5.2.3.1.
DC/DC Converting Circuit
This circuit generates +3.3V, +5V from the input +15V.
It is comprised of the circuit that steps +15V down to +3.3V by the switching power supply of IC801, Q801, and L810 and the
one that steps +15V down to +5V by the switching power supply of IC802, Q802, and L811.
It has two protection circuits : IP1 against +3.3V short and +5V short, and the over voltage protection that detects the voltage
build up of +3.3V/+5V, turns Q16 on, and then stop supplies of +15V.
It is comprised of the circuit that steps +15V down to +3.3V by the switching power supply of IC801, Q801, and L810 and the
one that steps +15V down to +5V by the switching power supply of IC802, Q802, and L811.
It has two protection circuits : IP1 against +3.3V short and +5V short, and the over voltage protection that detects the voltage
build up of +3.3V/+5V, turns Q16 on, and then stop supplies of +15V.
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