Changhong Electric PF29GA18A, Руководство по обслуживанию, Страница: 31 / 33

FSCQ1265RT
3
Pin Definitions
Pin Configuration
Figure 3. Pin Configuration (Top View)
Pin Number Pin Name Pin Function Description
1 Drain High voltage power SenseFET drain connection.
2 GND This pin is the control ground and the SenseFET source.
3 Vcc
This pin is the positive supply input. This pin provides internal operating
current for both start-up and steady-state operation.
4 Vfb
This pin is internally connected to the inverting input of the PWM comparator.
The collector of an opto-coupler is typically tied to this pin. For stable
operation, a capacitor should be placed between this pin and GND. If the
voltage of this pin reaches 7.5V, the over load protection triggers resulting in
shutdown of the FPS.
5 Sync
This pin is internally connected to the sync detect comparator for quasi
resonant switching. In normal quasi-resonant operation, the threshold of the
sync comparator is 4.6V/2.6V. Meanwhile, the sync threshold is changed to
3.0V/1.8V in extended quasi-resonant operation.
5.Sync
4.Vfb
3.Vcc
2.GND
1.Drain
TO-220F-5L