FS6X1220 Fairchild Semiconductor, FS6X1220 Datasheet - Page 2

• Manufacturer Part Number: FS6X1220
• Description: Fairchild Power Switch (FPS)
• Manufacturer: Fairchild Semiconductor

FS6X1220R
Pin Description
2
Pin Number
1
2
3
4
5
Line Sense
Pin Name
Feedback
Drain
GND
(FB)
(LS)
Vcc
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 is activated resulting
in shutdown of the IC.
According to the voltage of this pin, three operation modes are defined; Normal
operation mode, Line under voltage lock out mode and Sleep mode. If the
voltage of this pin is smaller than 2.55V, the IC goes into line under voltage
lock out stopping switching operation. If the voltage of this pin is smaller than
1.8V, the IC enters into sleep mode. During sleep mode, reference voltage
generation circuit including shunt regulator is disabled and only 300uA
operation current is required.
Pin Function Description