LM3429 PowerWise® N-Channel Controller

N-Channel Controller for Constant Current LED Drivers

image of Texas Instruments' LM3429 PowerWise® N-Channel ControllerTexas Instruments' LM3429 is a versatile high voltage N-channel MOSFET controller for LED drivers. It 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 LM3429 ideal for illuminating LEDs in a very diverse, large family of applications.

Adjustable high-side current sense voltage allows for tight regulation of the LED current with the highest efficiency possible. The LM3429 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 LM3429 includes a high-voltage startup 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 2.0 MHz, thus enabling compact solutions. Additional features include analog dimming, PWM dimming, over-voltage protection, under-voltage lock-out, cycle-by-cycle current limit, and thermal shutdown.

The LM3429 comes in a low profile, thermally-efficient TSSOP EP 14-lead package.

Typical Application Circuit Diagram

Features Applications
  • VIN range from 4.5 V to 75 V
  • Adjustable current sense voltage
  • High-side current sensing
  • 2 Ω, 1 A peak MOSFET gate driver
  • Input under-voltage protection
  • Over-voltage protection
  • PWM dimming
  • Analog dimming
  • Cycle-by-cycle current limit
  • Programmable switching frequency
  • Thermal shutdown
  • TSSOP EP 14-lead package
  • LED drivers
  • Constant-current buck-boost (or flyback) regulator
  • Constant-current boost regulator
  • Constant-current buck regulator
  • Constant-current SEPIC regulator
  • Thermo-electric cooler (Peltier) driver

N Channel Controller

ImageManufacturer Part NumberDescriptionTypeTopologyAvailable QuantityView Details
LM3429MH/NOPB datasheet linkIC LED DRIVER CTRLR DIM 14HTSSOPLM3429MH/NOPBIC LED DRIVER CTRLR DIM 14HTSSOPDC DC ControllerSEPIC, Step-Down (Buck), Step-Up (Boost)2221 - Immediate
LM3429MH/NOPB product page link
Published: 2009-10-09