# WS3413 Non-Isolated Buck APFC Offline LED Driver

## Features
️· Internal 550V Power MOSFET
️· Active PFC for High Power Factor and Low THD
️· Critical Conduction Mode Operation
️· System Efficiency up to 95%
️· LED Short/Open Protection
️· Current Sensing Resistor Open Protection
️· Auto Fault Recovery
️· Thermal Regulation Function
️· Available in DIP7/SOP8 Package

## Applications
️· E27 LED Bulb, Spot Light
️· PAR30, PAR38 Lamp
️· T8/T10 LED String
️· Other LED Lighting

## Description
The WS3413 is a high-precision, non-isolated buck driver with active PFC, designed for universal input offline constant current LED lighting. It achieves high power factor, low THD, and high efficiency through critical conduction mode operation. It integrates a 550V power MOSFET and offers rich protection functions.

## Pin Configuration (SOP8/DIP7)
️· COMP (1): Loop Compensation
️· GND (2): Ground
️· VCC (3): Power Supply (requires bypass capacitor)
️· FB (4): Feedback Voltage Input
️· D (5/6): Internal HV Power MOSFET Drain
️· CS (7/8): Current Sense Pin (requires resistor to GND)

## Electrical Characteristics (VCC=8V, TA=25°C)
️· VCC_clamp: 7.5-8.5V
️· VCC_ST: 7.07-8.07V
️· RDSON: 2.8-3.5Ω
️· VDS: 550V
️· TREG: 150°C

## Application Information
️· Soft start functionality
️· Constant current control via inductor current sensing. Output current calculated by: I = 200mV/Rcs
️· Feedback network with FB falling threshold of 0.2V.
️· Thermal regulation reduces output current at 150°C.

## Package Information
️· Available in DIP7 and SOP8 packages.
️· Detailed dimensions provided in datasheet.

## Absolute Maximum Ratings
️· VCC: -0.3~8V
️· VD: -0.3~550V
️· PDMAX: 0.9W
️· TJ: 160°C
️· TSTG: -55~150°C