LM3429_14 Datasheet, PDF (1/50 Pages) Texas Instruments – LM3429Q1 N-Channel Controller for Constant Current LED Drivers

LM3429
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SNVS616F – APRIL 2009 – REVISED JANUARY 2010
LM3429
LM3429Q1 N-Channel Controller for Constant Current LED Drivers
Check for Samples: LM3429
FEATURES
1
•2 LM3429Q1 is an Automotive Grade product
that is AEC-Q100 grade 1 qualified (-40°C to
+125°C operating junction temperature)
• V_IN 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
APPLICATIONS
• LED Drivers - Buck, Boost, Buck-Boost, SEPIC
• Indoor and Outdoor SSL
• Automotive
• General Illumination
• Constant-Current Regulators
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.
The LM3429Q1 is an Automotive Grade product that is AEC-Q100 grade 1 qualified
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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