MP1521
High Efficiency White LED Driver
Monolithic Power Systems
General Description
The MP1521 is a constant-current Boost
Regulator.
This IC has three individual current-sensing feedbacks, which are ideal for driving multiple strings of series connected LEDs.
The OLS pin is designed for detecting loose or open LED connections.
The IC uses a peak current, constant minimum off-time architecture.
The feedback pins measure voltage across sense resistors in series with the LED strings.
When supplying a bias current of 20mA, the voltage drop across the sense resistor is only 0.
4V to minimize power loss.
Either a DC voltage or a PWM signal at the BRT/PWM input can control the LED brightness.
The...