LED Driver/Monitor

The AD8240 LED Driver monitor, in combination with an external Transistor supplies a constant 12 V to drive LED lamps. This allows cost-effective LED lamp monitoring and short-circuit protection. The output is regulated at 12 V when the supply voltage is between 12.5 V and 27 V.
A CMOS compatible, level-dependent, digital input CAN be used for PWM control of the LED brightness. VO is turned on when the PWM input is high and turned off when the input is low. The AD8240 is designed to work with a PWM frequency up to 500 Hz, and a typical PWM range from 5% to 95%.
Open LED detection is accomplished by measuring the change in LED lamp current caused by an open LED(s) through the use of an internal high-side current-sense Amplifier that amplifies the voltage across an external current shunt. The voltage across the shunt resistor is amplified to a level that CAN be measured by a Microcontroller A/D converter or a Comparator The ability to measure the change in LED lamp current is the key benefit of constant-voltage LED lamp driving.
By Analog Devices, Inc.
AD8240 's PackagesAD8240 's pdf datasheet

AD8240 Pinout will be updated soon..., now you can download the pdf datasheet to check the pinouts !
AD8240 Application circuits
AD8240 circuits
This is one application circuit of AD8240,If you need more circuits,please download AD8240's pdf datasheet.

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