LM3423MH

The LM3423MH is a versatile high voltage N-channel Controller for constant current LED drivers. It can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with an input voltage rating of 75V, makes the LM3423 device 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 device uses 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 devices include a high-voltage start-up regulator that operates over a wide input range of 4.5 to 75V. The internal PWM controller is designed for adjustable switching frequencies of up to 2MHz, thus enabling compact solutions.

• High-side adjustable current sense
• Input under-voltage and output over-voltage protection
• PWM and analogue dimming
• Cycle-by-cycle current limit
• Programmable switching frequency
• Zero current shutdown and thermal shutdown
• LED output status flag
• Fault status flag and timer
• 2Ω, 1A Peak MOSFET gate drive
• Green product and no Sb/Br