FSCQ FAIRCHILD [Fairchild Semiconductor], FSCQ Datasheet - Page 3

• Manufacturer Part Number: FSCQ
• Description: Green Mode Fairchild Power Switch (FPS)
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

Pin Definitions
Pin Configuration
Pin Number
1
2
3
4
5
Pin Name
Drain
GND
Sync
Vcc
Vfb
High voltage power SenseFET drain connection.
This pin is the control ground and the SenseFET source.
This pin is the positive supply input. This pin provides internal operating
current for both start-up and steady-state operation.
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, which
results in the FPS shutting down.
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. Whereas, the sync threshold is changed to
3.0V/1.8V in an extended quasi-resonant operation.
Figure 3. Pin Configuration (Top View)
TO-220F-5L
TO-3PF-7L
Pin Function Description
5.Sync
4.Vfb
3.Vcc
2.GND
1.Drain
5.Sync
4.Vfb
3.Vcc
2.GND
1.Drain
FSCQ-SERIES
3