The LM3424 is a versatile high voltage N-channel MOSFET controller for LED drivers. It
can be easily configured in buck, boost, buck-boost and SEPIC topologies. In addition, the LM3424
includes a thermal foldback feature for temperature management of the LEDs. This flexibility, along
with an input voltage rating of 75 V, makes the LM3424 ideal for illuminating LEDs in a large
family of applications.
Adjustable high-side current sense allows for tight regulation of the LED current with
the highest efficiency possible. The LM3424 uses standard peak current-mode control providing
inherent input voltage feed-forward compensation for better noise immunity. It is designed to
provide accurate thermal foldback with a programmable foldback breakpoint and slope. In addition, a
2.45V reference is provided.
The LM3424 includes a high-voltage startup regulator that operates over a wide input
range of 4.5 V to 75 V. The internal PWM controller is designed for adjustable switching
frequencies of up to 2.0 MHz and external synchronization is possible. The controller is capable of
high speed PWM dimming and analog dimming.
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