PMP10596, 24V Input 700mA Output Buck Regulator LED Driver Reference Design

PMP10596, 24V Input 700mA Output Buck Regulator LED Driver Reference Design. The PMP10596 reference design is an LED driver based on SIMPLE SWITCHER LM46002 buck regulator. The driver board takes 24V +/-25% input voltage and supplies700mA output current to drive up to 4 LEDs in series. The LM46002 is a 60V, 2A synchronous buck regulator with integrated FETs and in this design it is configured as a high efficiency constant current converter. This is accomplished by using the voltage across a current sense resistor as the feedback signal. To reduce the sense resistor power loss, a 2V voltage reference is used to bias the FB pin via a resistor network and, as a result, the equivalent feedback reference voltage becomes 0.35V, lower than the 1V feedback of the LM46002