Product Summary

The SD42525 is a step-down constant current converter with inductance current continuous-conduction mode, The SD42525 is used for driving LED or LEDs in series. The output current is adjustable which is up to 1A in 6~32V input voltage range. LED whose power is tens of watts can be driven by SD42525 with different input voltages and peripheral elements. With built-in power switch, average current of LED can be set through external high-side current sensing. Analog dimming and wide range PWM dimming are available through pin DIM and soft-start time can be set by capacitor value which is connected between pin DIM and ground. The SD42525 applications are (1)Low-voltage LED spotlight, replacing Halogen lamp ; (2)Car-mounted LED lamp ; (3)LED backup lamp; (4)LED signal lamp .

Parametrics

SD42525 absolute maximum ratings: (1)Supply Voltage VIN: －0.3 ~ +40 V ; (2)Switch Voltage VSW: －1~VIN+1 V ; (3)DIM voltage VDIM: －0.3 ~ +100 V; (4)SENSE voltage: －0.3~VIN V; (5)Junction Temperature: 150 ℃ ; (6)Lead Temperature: 260 ℃.

Features

SD42525 features: (1)Wide input voltage range: 6V~32V; (2)Maximum 1A output current; (3)Excellent output current accuracy: ±3%; (4)Multiplex pin DIM is used for chip switch, analog dimming and PWM dimming ; (5)Soft start function ; (6)LED open/short-circuit protection ; (7)Output constant current which is adjustable.

Diagrams

SD42525 pin connection