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 these controllers 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 feed-forward compensation.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.
