RT8492
Description
The RT8492 is a 4-CH LED driver controller that delivers well matched LED current to each channel of LED string. With external current sources, the number of LEDs per string is only limited by the current source and the VIN/ VOUT conditions. The current mode PWM boost type controller operates at a programmable switching frequency of up to 1MHz, with a wide VIN range covering from 9V to 32V. The switch driver is designed to drive industrial grade high power MOSFETs.
The PWM loop selects and regulates the LED string with the highest voltage string to 0.9V, thus allowing voltage mismatches between the LED strings. The RT8492 automatically detects and excludes any open and/short strings during operation from the PWM loop to prevent VOUT from over voltage.
The RT8492 also provides LED short protection. If LED short occurs and causes any LEDx but not all LEDx pin voltage greater than 8V, the CAP pin is charged up by internal 10μA. If the LED short condition lasts longer than the...
