LM3429 - N-Channel Controller for Constant Current LED Drivers from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Reference Designs Application Notes Knowledge Base

Features
VIN range from 4.5V to 75V
Adjustable current sense voltage
High-side current sensing
2Ω, 1A 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

General Description


The LM3429 is a versatile high voltage N-channel MosFET controller for LED drivers . More...


Applications


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
  Typical Application
click for larger image

Boost Standard Application

ParametersValues
Topology Buck-Boost, Boost, Sepic
Input Min Voltage 4.5 Volt
Input Max Voltage 75 Volt
Output Range Buck-Boost: above 3V, Boost: VIN to 75V
Efficiency (peak) 95 %
Output Min 3 Volt
Special Features Multi-topology LED Driver
Adjustable Output Yes
On/Off Pin Yes
Adj Switch Frequency Yes
Sync Pin No
Step-Down Yes
Step-Up Yes
Flyback Yes
RegType LED Driver
Temperature Min -40 deg C
Temperature Max 125 deg C
Feedback Voltage .1 Volt
Automotive Yes
PowerWise Yes


Typical Performance


click for larger image

Boost Efficiency Graph
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LM3429

 
4.50 <=
V in Lower
 V
 
<=
V in Upper
 V
 
<= 75.00
Ambient Temperature  °C <= 100


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Additional Resources
Application Notes


Block Diagram


click for larger image

Block diagram

Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM3429 N-Channel Controller for Constant Current LED Drivers 1048
Kbytes
5-Aug-09 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.


Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM3429MHTSSOP EXP PAD14NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now
1K+$1.40rail
of
94
NSUZXYTT
LM3429
MH
6 weeksN/A
LM3429MHXTSSOP EXP PAD14NOPB1260RoHS N/A Full productionN/A
 
Buy Now
1K+$1.40reel
of
2500
NSUZXYTT
LM3429
MH
8 weeksN/A
LM3429BKBSTEVALLM3429 - N-Channel Controller LED Driver Buck-Boost Evaluation BoardFull productionN/A
 
Buy Now
1+$90.001-
8 weeksN/A
LM3429BSTEVALLM3429 - N-Channel Controller LED Driver Boost Evaluation BoardFull productionN/A
 
Buy Now
1+$90.001-
8 weeksN/A

General Description


The 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 75V, 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 4.5V to 75V. 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.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3429MHABCD150XV1038680025950002736338335
LM3429MHXABCD150XV1038680025950002736338335

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.



Reference Designs
RD-173 - MR16 and PAR38 LED Bulb Reference Design Using National`s LM3429 LED Driver and the Nuventix SynJet® Coolers

Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1986: Application Note 1986 LM3429 Boost Evaluation Board 672
Kbytes
3-Aug-09 Download
AN-1985: Application Note 1985 LM3429 Buck-Boost Evaluation Board 705
Kbytes
3-Aug-09 Download
AN-1969: Application Note 1969 LM3424 Boost Evaluation Board 988
Kbytes
22-Aug-09 Download
AN-1967: Application Note 1967 LM3424 Buck-Boost Evaluation Board 1027
Kbytes
22-Aug-09 Download

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More Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1982: Application Note 1982 Small, Wide Input Voltage Range LM2842 Keeps LEDs Cool 63
Kbytes
15-Jul-09 Download

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[Information as of 7-Nov-2009]