LM3423

用于恒流 LED 驱动器的 N 通道控制器

The LM3421 and 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 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.

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LM3421Q1/LM3423Q1 are Automotive Grade

Products That are AEC-Q100 Grade 1 Qualified

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LM3421Q0/LM3423Q0 are Automotive Grade

Products That are AEC-Q100 Grade 0 Qualified

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VIN Range From 4.5 V to 75 V

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High-Side Adjustable Current Sense

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2-&3937;, 1-A Peak MOSFET Gate Driver

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Input Undervoltage and Output Overvoltage

Protection

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PWM and Analog 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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LED Output Status Flag LM3423/23Q1/23Q0

Only

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Fault Status Flag and Timer LM3423/23Q1/23Q0

Only