Universal High Brightness Off-Line LEDs Driven Controller

The YH9812 is a PWM high-efficiency low-cost LEDs driven control IC which provides an efficient solution  for off-line high-brightness LEDs lamps from rectified  line voltage ranging from 80VAC up to 277VAC. The  YH9812 drives an external N-channel power  MOSFET at a fixed switching frequency up to  500kHz. The switching frequency is determined by an  external single resistor. The YH9812 topology creates  a constant current through the LEDs delivering a  more uniform light output. The output current is programmed by one external resistor and is ultimately  determined by the external N-channel power  MOSFET chosen and therefore allows LEDs current  between a few mA and up to more than 1A.

The YH9812 supports a several kHz PWM dimming  input and a 0 to 250mV linear dimming input. The  YH9812 provides protection functions including input  Under Voltage Lockout (UVLO), output Short Circuit  Protection (SCP) and Over Temperature Protection (OTP). The YH9812 is available in a standard 8-lead  SOP plastic (SOP-8) package.

Features 

 High efficiency up to 90%

 ± 2% Current sensing voltage variation 

 Universal rectified 80VAC to 277VAC input range

 DC input voltage range from 8V to 500V 

 Input voltage surge rating up to 500V

 Application from a few mA up to more than 1A 

 Switching frequency up to 500kHz 

 Open loop peak current controller 

 Support PWM and linear dimming 

 Input under voltage lockout

 Over temperature protection 

 Output short circuit protection 

 Drive an external low-cost N-channel MOSFET 

 Available in a SOP-8 package

 RoHS compliant and halogen free

Applications

 Off-line LEDs lamp

 Back lighting of flat panel display 

 Signage and decorative LEDs lighting 

 General purpose constant current source 

 High voltage DC-DC LEDs driver 

 Automotive LEDs lighting

 Charger