LM3430 Datasheet, PDF (1/35 Pages) Texas Instruments – Boost Controller for LED Backlighting

LM3430
www.ti.com
SNVS472B – JANUARY 2007 – REVISED MAY 2013
Boost Controller for LED Backlighting
Check for Samples: LM3430
FEATURES
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•2 Internal 40V Startup Regulator
• 1A Peak MOSFET Gate Driver
• V_IN Range 6V to 40V
• Duty Cycle Limit in Excess of 90%
• Programmable UVLO with Hysteresis
• Cycle-by-Cycle Current Limit
• External Synchronizable (AC-coupled)
• Single Resistor Oscillator Frequency Set
• Slope Compensation
• Adjustable Soft-start
• WSON-12 (3mm x 3mm)
APPLICATIONS
• LED Backlight Driver (companion to LM3432)
• Boost Converter
• SEPIC Converter
DESCRIPTION
The LM3430 is a high voltage low-side N-channel
MOSFET controller. Ideal for use in a boost regulator,
the LM3430 can power the LED backlight in LCD
panels, such as in notebook PCs. It contains all of the
features needed to implement single ended primary
topologies. Output voltage regulation is based on
current-mode control, which eases the design of loop
compensation while providing inherent input voltage
feed-forward. The LM3430 includes a start-up
regulator that operates over a wide input range of 6V
to 40V. The PWM controller is designed for high
speed capability including an oscillator frequency
range up to 2 MHz and total propagation delays less
than 100 ns. Additional features include an error
amplifier, precision reference, line under-voltage
lockout, cycle-by-cycle current limit, slope
compensation, soft-start, external synchronization
capability and thermal shutdown. The LM3430 is
available in the WSON-12 package.
Typical Application
V_IN
V_O
VDHC
NC
VIN
OUT
RT
CS
LM3430
UVLO
GND
SS
VCC
COMP
FB
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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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