Internal HV Start-up High-accuracy Primary-Side Converter
for LED without Auxiliary Winding
Product：PN8327
1、General Description 
The PN8327 consists of a high precision CC primary side controller and a power MOSFET, specifically designed for a high
performance low power LED lighting with minimal external components and duplex winding. The chip operates in primary-side
sensing and regulation, so opto-coupler and TL431 could be eliminated. The chip adopts a patent HV DMOS self-supply technology,
so auxiliary winding and HV Start-up resistance could be eliminated. The chip offers complete protection coverage with automatic
self-recovery feature including Cycle-by-Cycle current limiting protection (OCP) and feedback loop open protection (OLP), over
temperature regulation (OTC) , Rcs open/short Protection and LED-open/short circuit protection etc. Internal HV Start-up circuit and
the chip’s very low consumption help to meet high efficiency. In CC control, the current and output power setting can be adjusted
externally by the sense resistor Rcs at CS pin.

2、 Features 
■ Internal 650V avalanche-rugged power MOSFET
■ Internal HV Start-up Circuit without external HV Start-up
resistance
■ Primary-side Sensing and Regulation Without TL431 and
Opto-coupler
■ Internal HV self-supply without auxiliary winding
■ Patented Built-in Line compensation circuit
■ ±3% Constant current Regulation
■ Adjustable CC Regulation
■ 0.5% precision Line voltage Compensation
■ Built-in Primary winding inductance compensation
■ Excellent Protection Coverage: