FS6X0420R FAIRCHILD [Fairchild Semiconductor], FS6X0420R Datasheet - Page 3

• Manufacturer Part Number: FS6X0420R
• Description: Fairchild Power Switch (FPS)
• Manufacturer: FAIRCHILD [Fairchild Semiconductor]

FS6X0420RJ/ FS6X0720RJ/ FS6X1220RJ Rev. 1.0.1
Pin Assignments
Pin Definitions
Pin Number
1
2
3
4
5
6
Line Sense (LS)
Pin Name
Feedback
Drain
GND
(FB)
N.C.
Vcc
Figure 3. Pin Configuration (Top View)
This pin is the 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 collec-
tor 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.
This pin is not connected.
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 the 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 the shunt regulator is
disabled and only 300uA operation current is required.
D2-PAK-6L
3
6. Line Sense
5. N.C.
4. Vfb
3. Vcc
2. GND
1. Drain
Pin Function Description
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