LM3557SD-2

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PMIC - LED Drivers

LM3557SD-2 is a high power LED driver designed by National Semiconductor. It is a dual-channel synchronous buck converter with a switching frequency of 1.2 MHz. It can drive LEDs at up to 20V, 400mA with a wide range of dimming levels. The device is designed to be easy to use and configure, and it comes with built-in capabilities to monitor and protect against fault conditions.

Application Field

The LM3557SD-2 is designed to drive high brightness LEDs in a wide range of applications. It is suitable for applications such as LCD backlighting, automotive lighting, and general illumination. The device supports input voltages from 6V to 40V, making it suitable for a wide range of power sources.

Working Principle

The LM3557SD-2 is a synchronous buck converter. It takes a DC input voltage, usually between 6V and 40V, and steps it down to a lower output voltage at a high efficiency. The output voltage can be set using external resistor values and is adjustable from 0V to 20V. The output current is set using a single external resistor and is adjustable from 0mA to 400mA. The converter operates at a fixed frequency of 1.2 MHz and uses integrated MOSFETs to provide the switching action.

The device includes an advanced current-limit protection circuit for short circuit protection, over-temperature protection, and overcurrent protection. The device also includes an undervoltage lockout circuit to protect the LEDs and external components from damage in the event of an input voltage drop.

Conclusion

The LM3557SD-2 is a high power, flexible LED driver designed to drive LEDs at up to 20V, 400mA with a wide range of dimming levels. The device is designed to be easy to use and configure and comes with built-in protections to guard against fault conditions. The LM3557SD-2 is suitable for applications such as LCD backlighting, automotive lighting, and general illumination.

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