- LM3421Q1/LM3423Q1 are automotive AEC-Q100 standard class 1 qualified (-40°C to +125°C operating junction temperature) and the LM3421Q0/LM3423Q0 AEC - Q100 standard class 0 qualified (-40°C to +150°C class C operating junction temperature)
- Range V from 4.5V to 75V
- Adjustable high-side current sensing
- 2Ω, 1A peak MOSFET gate driver
- Input voltage and output overvoltage protection
- PWM and analog dimming
- Cycle-by-cycle current limit
- Programmable switching frequency
- "Zero current shutdown and thermal shutdown
- LED output status flag (LM3423/23Q1/23Q0 only)
- Fault Status Flags and Timers (LM3423/23Q1/23Q0 only)
illustrate
The LM3421/23 are versatile high voltage LED driver N-channel MOSFET controllers. They can be easily configured in buck, boost, buck-boost and SEPIC topologies. This flexibility, along with a 75V rated input voltage, makes the LM3421/23 ideal for a large number of home lighting applications.
Adjustable high-side current sense voltage maximizes the efficiency of tightly regulated LED current. The LM3421/23 uses the Predicted Off-Time (Pro) Control, which is a combination of peak current mode control and a predictive shutdown timer. This control method simplifies loop compensation design while providing inherent input voltage feedforward compensation.
The LM3421/23 unit includes a high voltage start-up regulator over a wide input voltage range of 4.5V to 75V. The adjustable switching frequency up to 2.0 MHz is designed with an internal PWM controller, resulting in a compact solution. Other features include "zero current" shutdown, analog dimming, PWM dimming, overvoltage protection, undervoltage lockout, cycle-by-cycle current limit, and thermal shutdown.
The LM3423 also includes LED output status flags, fault flags, a programmable fault timer, and logic inputs to select the polarity of the dimmed output driver.
LM3421Q1/23Q1 is AEC - Q100 Standard Class 1 qualified, LM3421Q0/23Q0 AEC - Q100 Standard Class 0 qualified.
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- LED drivers - buck, boost, buck-boost, and SEPIC
- Indoor and outdoor areas SSL
- Car
- General lighting
- Constant current regulator
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