LED7708 16 channels x 85 mA LED driver with boost controller and 4-wire serial interface

The LED7708 has been specifically designed to supply several LEDs starting from a single low-voltage rail. It integrates a boost controller, sixteen current generators and a 4-wire serial interface. The boost controller regulates the output voltage in an adaptive way, according to the LED requirements, resulting in an improved overall efficiency. All the current generators are 40 V-rated, allowing the LED7708 to drive several LEDs in series on each channel. The channels can be put in parallel for higher output current.

The brightness of the LEDs is controlled by using the serial interface. A selectable 12-bit or 16-bit grayscale brightness control allows independent PWM on each channel. A programmable on-chip dimming oscillator is provided for external circuitry simplification. The device has dedicated pins to lock to an external synchronization with other devices (master or slave) for noise reduction in multi-device applications. The LED7708 implements basic protection (OVP, OCP and thermal shutdown) as well as LED array protection. It can detect and manage open-LED and shorted-LED faults and different fault-management options are available in order to cover most application needs

技术特性

Boost controller section
- 3.6 V to 36 V input voltage range (LDO)
- Adaptive output voltage for high efficiency
- Internal +5 V LDO for gate driver supply
- Internal +3.3 V LDO for device supply
- High performance external MOSFET driver
- 250 kHz to 1 MHz switching frequency
- Programmable OV and OC protection
- Fixed frequency peak current-mode control
- External synchronization for multi-device application
- Overtemperature alert and thermal shutdown
LED array driver section
- 16 channels with 85 mA/ch current capability
- ±2% channel current accuracy
- ±2% channel-to-channel current matching
- LED short-circuit and open channel fault detection and management
- 4-wire, 30 MHz serial interface
- 16 x16-bit, 1x256-bit or 1x192-bit serial data formats
- Grouped or independent channel PWM control
- Selectable 12/16-bit grayscale brightness control for local dimming
- Programmable internal dimming oscillator
- Programmable grayscale latency
- Master/slave chain configuration supported

应用原理图

LED7708 订购信息

订购型号	产品状态	美金价格	数量	封装	包装形式	温度范围	材料声明
LED7708TR	Active		1000	VFQFPN 48 7x7x1.0	Tape And Reel		LED7708TR
LED7708	Active		1000	VFQFPN 48 7x7x1.0	Tube		LED7708

DATASHEET

描述	版本	大小
LED7708 : DS8850: 16 channels x 85 mA LED driver with boost controller and 4-wire serial interface	1	856KB

BOARDS AND TOOLS

型号	描述
STEVAL-ILL035V1	Multi-channel LED driver with integrated boost controller for medium, large LCD panel backlight based on LED7708 and STM32F103C6T6A

MARKETING BROCHURES

描述	版本	大小
LED drivers for backlighting and lighting applications	1.0	1821KB