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71727374757677787980
CP-850FX Service Manual
Europe R&D
75
continues falling because the HIC’s oscillation is suspended until the Vcc terminal voltage (Pin 4)
reaches the operation start-up voltage 18V (TYP). Thus it is required to secure the voltage
exceeding the required output voltage of secondary side.
Fig.18. Timing-Chart at Operation
Switching
Normal Operatio
n
Feedback
Stop
Voltage
Start-up
Voltage
Normal Operation Standby Operation
Power MOSFET
Waveform
Secondary
Output Voltage
Stand-by
detection level
V
CC
Start-up
Voltage at stand-by
V
FB(S)
V
CC(S)
V
CC(ON)
V
CC(OFF)
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