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Monolithic Power Systems (MPS) MP4657B 4-String LED Driver and System Voltage Controllers are built for LED backlighting on the secondary side. The MP4657B controls the flyback power stage and utilizes an external N-channel MOSFET to regulate the system output voltage, and the LED current loop with integrated 4-string LED current balancing. Implementing a 4V to 16V input voltage, the device outputs a direct driving signal to control the N-channel MOSFET for regulating the system output voltage. Furthermore, the device outputs a compensation signal to control the primary-side flyback (or other power stages) through an optocoupler.
The MPS MP4657B 4-String LED Driver and System Voltage Controllers feature-rich protections to increase the system reliability. Protections are optimized for the system voltage and LED driver stages. LED driver stage protections include LED open protection, LED short protection, and LEDx pin short to ground protection. The system voltage stage protections include over-voltage protection (OVP) and feedback open-loop protection. Additionally, the MP4657B also has thermal protection.
The MP4657B 4-String LED Driver and System Voltage Controllers are housed in a SOIC-16 package.
