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LM3429

National Semiconductor
Part Number LM3429
Manufacturer National Semiconductor
Description N-Channel Controller
Published Jun 26, 2009
Detailed Description LM3429 N-Channel Controller for Constant Current LED Drivers www.DataSheet4U.com PRELIMINARY LM3429 April 30, 2009 ...
Datasheet PDF File LM3429 PDF File

LM3429
LM3429

Overview
LM3429 N-Channel Controller for Constant Current LED Drivers www.
DataSheet4U.
com PRELIMINARY LM3429 April 30, 2009 N-Channel Controller for Constant Current LED Drivers General Description The LM3429 is a versatile high voltage LED driver controller.
With the capability to be configured in a Buck, Boost, BuckBoost (Flyback), or SEPIC topology, and an input and output operating voltage rating of 75V, the LM3429 is ideal for illuminating LEDs in a very diverse, large family of applications.
Adjustable high-side current sense with a typical sense voltage of 100 mV allows for tight regulation of the LED current with the highest efficiency possible.
Output LED current regulation is based on peak current-mode control with predictive Off-Time Control.
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.
5V to 75V.
The internal PWM controller is designed for adjustable switching frequencies of up to 2.
0MHz, thus enabling compact solutions.
Additional features include: precision reference, logic compatible DIM input suitable for fast PWM dimming, cycle-by-cycle current limit, and thermal shutdown.
The LM3429 comes in a low profile, thermally efficient TSSOP EP 14-lead package.
Features ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ ■ VIN range from 4.
5V to 75V 2% Internal reference voltage (1.
235V) Current sense voltage adjustable from 20 mV High-side current sensing 2Ω MOSFET gate driver Dimming MOSFET gate driver Input under-voltage protection Over-voltage protection Low shutdown current, IQ < 1µA Fast (50kHz) PWM dimming Cycle-by-cycle current limit Programmable switching frequency TSSOP EP 14-lead package Applications ■ ■ ■ ■ ■ ■ LED Drivers Constant-Current Buck-Boost Regulator Constant-Current Boost Regulator Constant-Current Flyback Regulator Constant-Current SEPIC Regulator Thermo-Electric Cooler (Peltier) Driver T...


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