Universal and Dimmable LED Driver

Features

l Input voltage range from 5V to 450V

l Cascode topology for lower switching loss and surge voltage

l Constant off time control

l Line compensation of output current

l Enable pin

l Switch/PWM/Linear dimming function

l Leading-edge blanking

l Frequency modulation in short circuit protection and low output voltage condition

l Over-temperature protection

l Over-current protection

l SOP-8 package, with few external components needed

General Description

The GR8210 is a high brightness LED driver with the cascode topology that patented by Grenergy. A high voltage power NMOSFET, BVDSS is 600V, as the high side device and the power NMOSFET inside the GR8210 as the low side device in this cascode topology. A Zener voltage, was generated by ST pin of the GR8210, turn on the high side device all the time by connected to the gate terminal of the high side device. The source terminal and the drain terminal of the high side device are connected to the DRN pin of the GR8210 and the input voltage rail respectively to absorb the very large voltage potential. The current peak value was decided by the sensing resistor in the CS pin, the low side device was turned off by the current peak detection then delay a fixed off time that set by the resistor in the RT pin of GR8210.

There are PWM and liner dimming in GR8210 to adjust the LED brightness. In the abnormal operation, the inner OTP function could protect the IC damage.

* Refer to Feature List on page 2 for the switching dimming function

Application

l DC/DC or AC/DC LED driver application

l LED T-bar lighting

l Cabin light in car

l Non-isolation lighting in high input voltage

Typical Application Circuit

Package