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