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LED7708TR 数据表(PDF) 1 Page - STMicroelectronics |
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LED7708TR 数据表(HTML) 1 Page - STMicroelectronics |
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1 / 53 page  This is information on a product in full production. May 2012 Doc ID 022698 Rev 1 1/53 53 LED7708 16 channels x 85 mA LED driver with boost controller and 4-wire serial interface Datasheet —production data Features ■ 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 Applications ■ TV and monitor backlight units for LCD panels ■ Medium and large size LCD panel backlights ■ RGB/RGGB backlight solutions Description 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. Table 1. Device summary Order codes Package Packing LED7708 VFQFPN-48 7x7 (exposed pad) Tube LED7708TR Tape and reel www.st.com |
类似零件编号 - LED7708TR |
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类似说明 - LED7708TR |
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