Product Summary

The SD42522 is a step-down PWM control LED driver with a built-in power MOSFET. It achieves 1A continuous output current in 6~36V input voltage range. It provides thermal shutdown circuit, current limit circuit and PWM dimming circuit. The SD42522 adopts current mode control which provides fast transient response and simple loop stabilization design. It has high efficiency up to more than 96%, and has excellent constant current characteristic when the input/output voltage changed, with the excellent current accuracy within ±1%. The applications of the SD42522 include MR16 LED spotlight, LED illuminance, LED street lamp.

Parametrics

SD42522 absolute maximum ratings: (1)Supply Voltage, VIN: 40V; (2)Switch Voltage, VSW: -1~VIN+1V; (3)PWM Voltage, VPWM: -0.3~6V; (4)Comp Voltage, VCOMP: -0.3~6V; (5)SENSE voltage, VSENSE: -0.3~VINV; (6)Junction Temperature, Tj: 150℃; (7)Lead Temperature, TL: 260℃; (8)Storage Temperature, TSTG: -65~150℃; (9)Input Voltage, VIN: 6~40V; (10)Operating Temperature, TOPR: -40~125℃.

Features

SD42522 features: (1)6-36V input voltage range; (2)Maximum 1A output current; (3)0.40Ω built-in power MOSFET; (4)Integrate Jitter function; (5)Thermal compensation; (6)PWM dimming function; (7)280kHz fixed frequency; (8)Excellent constant current accuracy ±1%; (9)High efficiency up to 96%; (10)Thermal shutdown; (11)Cycle-by-cycle over current protection.

Diagrams

SD42522 block diagram