May 2009
Doc ID 14893 Rev 1
1/17
AN2810
Application note
6-row 85 mA LED driver with boost
converter for LCD panel backlighting
Introduction
The LED7707 LED driver from STMicroelectronics consists of a high-efficiency monolithic
boost converter and six controlled current generators (rows), specifically designed to supply
LED arrays used in the backlighting of LCD panels. The device can manage an output
voltage up to 36 V (i.e. ten white-LEDs per row). The generators can be externally
programmed to sink up to 85 mA and can be dimmed via a PWM signal (1% of minimum
dimming duty-cycle at 1 kHz can be managed). The device allows detection and
management of open and shorted LED faults, and permits unused rows to be left floating.
Basic protections (output overvoltage, internal MOSFET overcurrent and thermal shutdown)
are provided.
Figure 1.
LED7707 demonstration board
