The LED7707 LED driver is 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.
This document is an application note for the LED7707, a monolithic boost converter and six controlled current generators designed for LCD panel backlighting. It details the device's features, including a 4.5 V to 36 V input range and up to 85 mA per row.
The note also covers the LED7707 demonstration board, providing a component list, assembly instructions, and layout guidelines. It includes sections on I/O interfaces, recommended test equipment, and configuration options for switching frequency and fault management.
| Input voltage range | 4.5 V to 36 V |
|---|---|
| Output voltage | Up to 36 V |
| Maximum current per row | 85 mA |
| Switching frequency range | 250 kHz to 1 MHz |
| LEDs per row | Up to 10 |
It is designed to supply LED arrays used in the backlighting of LCD panels.
The device has six controlled current generators (rows).
The demonstration board allows selection between a fixed 660 kHz or an adjustable frequency up to 1 MHz.