DESCRIPTION
The switching frequency can be programmed by a resistor. It generates an output voltage up to 45V from a 3V to 26V input supply. The MP3387L independently regulates the current in each LED string to the value set by an external current-setting resistor. The MP3387L applies 6 internal current sources in each LED string terminal to achieve a current balance with 3% current regulation accuracy between strings. Its low 500mV regulation voltage on LED current sources reduces power loss. The MP3387L features external digital PWM dimming and analog dimming, both of which sharing a single input with 25% PWM duty cycle as a transfer point. The mix-dimming strategy helps to improve the dimming ratio. Also, MP3387L automatically transfers the PWM input signal 100Hz to 20kHz frequency to 24kHz to 27.5kHz to eliminate the audible noise. MP3387L has rich protection modes to guarantee safety operation. The protection modes include recoverable OCP (over-current protection), OVP (over-voltage protection), OTP (over-temperature protection), any string of LED short and open protection.
Monolithic Power Systems
