The MP4658 is a 4-string, secondary-side LED driver for LED backlighting, and is ideal for monitors and small-sized TV LED backlighting. It controls the flyback power stage to regulate the LED current loop and the output supply voltage. The MP4658 integrates a 4-string LED for current balancing. Powered by a 6V to 36V input voltage (VIN), the MP4658 outputs a compensation signal to control the primary-side flyback (or other power stage) via an optocoupler to regulate the output voltage (VOUT).
The MP4658 supports analog dimming and pulse-width modulation (PWM) dimming to the LED current via the ADIM and PDIM pins. For analog dimming, apply a pulse signal with a frequency above 5kHz to the ADIM pin. For PWM dimming, apply a low-frequency PWM signal to the PDIM pin. The MP4658 also supports analog mode PWM dimming to the LED current, which makes the LED current rise and fall softly.
The MP4658 features numerous smart protections to increase system reliability, including open LED protection, short LED string protection, LEDx short-to-ground protection, feedback over-voltage protection (OVP), feedback open protection, and thermal protection.
The MP4658 is available in an SOIC-16 package.
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