LM3533TMX-40A/NOPB

LM3533TMX-40A/NOPB is a LED driver from the Power Management IC – LED Driver family. It offers an integrated solution for controlling the power output of multiple LEDs. This driver is best suited for applications where reliability and efficiency of LED lighting are critical. The device works by using the output of an internal power MOSFET to modulate the current through one or more parallel connected LEDs.

Application Field

LM3533TMX-40A/NOPB can be used to control the power output of multiple LEDs. It is suitable for applications in which reliability and efficiency of LED lighting is critical, such as backlight display, automotive, general illumination and signage, etc. It is also suitable for applications where current regulation of multiple LEDs is required.

Working Principle

LM3533TMX-40A/NOPB works by using the output of an internal power MOSFET to modulate the current through one or more parallel connected LEDs. It has an internal low-side, dc-dc synchronous buck converter that senses the forward voltage drop across the LEDs to create constant current. The device is also capable of dimming, where the brightness of the LEDs can be adjusted by modifying the voltage or the duty cycle of the DC/DC converter. The device is also capable of working in the PFM (Pulse Frequency Modulation) or PWM (Pulse Width Modulation) mode. In PWM mode, the gating of the DC/DC converter is done according to the PWM-signal applied to the EN (Enable) pin. LM3533TMX-40A/NOPB also has an adjustable fault protection which shuts down the device in case of a fault and prevents damage to the LED.

Conclusion

LM3533TMX-40A/NOPB is a device from the Power Management IC – LED Drivers family. It can be used to control the power output of multiple LEDs and is suitable for applications in which reliability and efficiency of LED lighting are critical. The device works by using the output of an internal power MOSFET to modulate the current through one or more parallel connected LEDs, and it is capable of working in the PWM or PFM mode. It also has an adjustable fault protection which shuts down the device in case of a fault and prevents damage to the LED.