DESCRIPTION
It employs 12-bit pulse-width modulation (PWM) dimming and 6bit analog dimming register per channel, with individual control of each channel. The MPQ7225 is designed to function across distanced PCBs with a robust, high-speed, CANcompatible differential interface. The MPQ7225 features adaptive feedback control (AFC) to maximize system efficiency. The output voltage of the pre-regulator (e.g. buck voltage regulator) is adjusted in real time so that the voltage across the channels is kept at a minimum value (typically 300mV headroom at 200mA). Frequency spread spectrum (FSS) optimizes EMC performance. The LED current’s ramping rate and the phase shift between channels can be digitally configured as well. The MPQ7225 can aid a system design for functional safety with a failsafe (/FS) indicator. The full protection suite includes LED open/short protection, ISET pin open/short protection, and thermal shutdown. If a fault condition occurs, the fault indicator pulls low, and the matching fault register is set.
Monolithic Power Systems
