LM3421MH

TEXAS INSTRUMENTS  LM3421MH  发光二极管驱动器, 2输出, 升压, 降压, 反激, SEPIC, 4.5V-75V输入, 2MHz开关, 75V输出, TSSOP-16

The 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 LM3421 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.

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High-side adjustable current sense

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Input under-voltage and output over-voltage protection

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PWM and analogue dimming

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Cycle-by-cycle current limit

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Programmable switching frequency

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Zero current shutdown and thermal shutdown

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2R, 1A Peak MOSFET gate drive

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Green product and no Sb/Br