LED7706TR datasheet(1/31 Pages) STMICROELECTRONICS

部件名	LED7706TR

功能描述	6-rows 30 mA LEDs driver with boost regulator for LCD panels backlight

PDF	31 Pages

Scroll/Zoom	100%

制造商	STMICROELECTRONICS [STMicroelectronics]

网页	http://www.st.com

标志

1 / 31 page

February 2008

Rev 1

1/31

31

LED7706

6-rows 30 mA LEDs driver with boost regulator

for LCD panels backlight

Features

■ Boost section

– 4.5 V to 36 V input voltage range

– Internal power MOSFET

– Internal +5 V LDO for device supply

– Up to 36 V output voltage

– Constant frequency peak current-mode

control

– 250 kHz to 1 MHz adjustable switching

frequency

– External synchronization for multi-device

application

– Pulse-skip power saving mode at light load

– Programmable soft-start

– Programmable OVP protection

– Stable with ceramic output capacitors

– Thermal shutdown

■ Backlight driver section

– Six rows with 30 mA maximum current

capability (adjustable)

– Parallelable rows for higher current

– Rows disable option

– Less than 500 ns minimum dimming time

(1 % minimum dimming duty-cycle at 20

kHz)

– ±2 % current matching between rows

– LED failure (open and short-circuit)

detection

Applications

■ LCD monitors and TV panels

■ PDA panel backlight

■ GPS panel backlight

Description

The LED7706 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. 10 white LEDs per row).

The generators can be externally programmed to

sink up to 30 mA and can be dimmed via a PWM

signal (1 % dimming duty-cycle at 20 kHz can be

managed). The device allows to detect and

manage the open and shorted LED faults and to

let unused rows floating. Basic protections

(Output Over-Voltage, internal MOSFET

Over-Current and Thermal Shutdown) are

provided.

VFQFPN-24 4x4

Table 1.

Device summary

Order code

Package

Packaging

LED7706

VFQFPN-24 4x4 (exposed pad)

Tube

LED7706TR

Tape and reel

www.st.com

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