Texas Instruments LM3421
The LM3421 and LM3423 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 these controllers ideal for illuminating LEDs in a large family of applications.| Part No. | LM3421 |
|---|---|
| Datasheet | LM3421 Download |
| Manufacturer |  Texas Instruments |
| Description | N-Channel Controllers |
| Buy | Stock & Price |
FEATURES
●1 VIN Range From 4.5 V to 75 V● High-Side Adjustable Current Sense
● 2-Ω, 1-A Peak MOSFET Gate Driver
● Input Undervoltage 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 and LM3423-Q0 Only)
● Fault Status Flag and Timer(LM3423 and LM3423-Q0 Only) 2
APPLICATIONS
● LED Drivers: Buck, Boost, Buck-Boost, and SEPIC● Indoor and Outdoor Area SSL
● Automotive
● General Illumination
● Constant-Current Regulators 3
DESCRIPTION
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 highvoltage start-up regulator that operates over a wide input range of 4.5 V to 75 V.
