Datasheet FSD176MRT (ON Semiconductor) - 4

Figure 3. Pin Configuration (Top View) Pin Definitions
Pin # Name Description 1 Drain SenseFET Drain. High-voltage power SenseFET drain connection. 2 GND Ground. This pin is the control ground and the SenseFET source. 3 VCC Power Supply. This pin is the positive supply input, which provides the internal operating
current for both startup and steady-state operation. 4 FB Feedback. 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 V, the
overload protection triggers, which shuts down the FPS. 5 NC No Connection 6 VSTR Startup. This pin is connected directly, or through a resistor, to the high-voltage DC link.
At startup, the internal high-voltage current source supplies internal bias and charges the
external capacitor connected to the VCC pin. Once VCC reaches 12 V, the internal current
source (ICH) is disabled. © 2011 Fairchild Semiconductor Corporation
FSD176MRT • Rev. 1.0.1 FSD176MRT — Green-Mode Fairchild Power Switch (FPS™) Pin Configuration www.fairchildsemi.com
3