The LM3421 and LM3423 family of devices are versatile high voltage N-channel MOSFET
controllers for LED drivers. They can be easily configured in buck, boost, buck-boost and SEPIC
topologies. This flexibility, along with an input voltage rating of 75 V, makes the LM3421 and
LM3423 devices ideal for illuminating LEDs in a large family of applications.
Adjustable high-side current sense voltage allows for tight regulation of the LED current
with the highest efficiency possible. The LM3421 and LM3423 devices use predictive off-time (PRO)
control, which is a combination of peak current-mode control and a predictive off-timer. This
method of control eases the design of loop compensation while providing inherent input voltage
The LM3421 and LM3423 devices include a high-voltage start-up 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 MHz, thus enabling compact solutions.
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