IS32LT3965
DESCRIPTION
The IS32LT3965 is a synchronous DC/DC switching LED driver that integrates high-side and low-side Nchannel MOSFETs to operate in a Buck configuration. The device can operate from a wide input voltage between 3.8V and 38V and provides a constant current of up to 1.5A for driving a single LED or multiple series connected LEDs.
The external resistor, RIS, is used to set a constant LED output current, while allowing the output voltage to be automatically adjusted for a variety of LED configurations.
The IS32LT3965 operates in a fixed frequency mode during switching, up to 2.2MHz. There is an external resistor connected between the VCC and TON pins used to configure the on-time (switching frequency). The switching frequency is dithered in spread spectrum operation which spreads the electromagnetic energy over a wider frequency band. This function is helpful for optimizing EMI performance.
A logic input PWM signal applied to the enable (EN/PWM) pin will adjust the average LED...
