CP-850FX Service Manual
Europe R&D
66
5.10.1.3 Overvoltage Protection Circuit
Where the voltage exceeding 27.5V(TYP) is imposed on between Vcc and GND terminals, the
OVP circuit of the control IC starts its operation and turns latch-mode, and the control IC stops its
oscillation. Generally, the Vcc terminal voltage is supplied from the auxiliary winding of the
transformer, and the voltage is in proportion to the output voltage; thus, the circuit also operates
at that time when the overvoltage output of the secondary side comes out such as the voltage
detection circuit open.
The secondary output voltage at the Overvoltage Protection circuit operation is obtained form the
following formula:
）Ｖ（
端子電圧通常動作時
通常動作時出力電圧
≒ TYP5.27)Vout(
OVP ×
CC
OUT
V
VV
･･････
(1)式
VOUT at Normal Operation
VOUT (OVP) ≒ --------------------------------------------------------- X 27.5V (TYP) …… (1)
Vcc Terminal Voltage at Normal Operation
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