DATASHEET and Circuit Diagram

The schematic diagram below appears LM3909 Typical 1.5V Flasher circuit. It is known that LM3909 is an oscillator, a monolithic one, which is designed to flash Light Emitting Diodes (LED).

If you consider in designing a LED lamp driver using a low noise boost buck topology to control the application, you may use the HV9930 from Supertex. It can be applied to RGB backlight applications, battery powered LED lamps, and other low voltage AC/DC or DC/DC LED drivers.

the AT9933 LED driver IC is typically ideal for automotive LED lamps since this IC has features such as Constant current LED Driver, Ambient temperature rating up to 125°C, Meets AEC-Q100 requirements, Input and output current sensing, Enable & PWM dimming, Internal 75V linear regulator, Steps input voltage up or down and low EMI.

This article may be useful for you in the terms of selecting HB LED driver for Automotive Lighting Applications since it reviews HB LED driver topologies and recommends configurations for various automotive lighting including dome lighting, daytime running lights (DRL), rear combination lights (RCL), fog lamps, and low-/high-beam lights.

ZXLD1100 is a PFM flyback DC to DC boost converter that work in discontinuos mode. The following circuit diagram show you about setting 4 LED Driver for Handset LCD Backlight using this device. The ZXLD1100 designed for driving 2,3,4 series connected white LEDs from a Li-on cell and up to 8 LEDs from 5 V supply.