LM3430 Datasheet | National Semiconductor

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 pensation 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 pensation, soft-start, external synchronization capability and thermal shutdown. The LM3430 is available in the LLP-12 package. Features - - - - - - - - - - - Internal 40V Startup Regulator 1A Peak MOSFET Gate Driver VIN 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 pensation Adjustable Soft-start LLP-12 (3mm x 3mm) Applications - LED Backlight Driver (panion to LM3432) - Boost Converter - SEPIC Converter Typical Application © 2007 National Semiconductor Corporation .national. .. Connection Diagram 12-Lead LLP Package NS Package Number SDF12A Ordering Information Part Number LM3430SD LM3430SDX NS Package Drawing SDF12A SDF12A Supplied As 1000 Units on Tape and Reel 4500 Units on Tape and Reel Pin Descriptions Pin(s) 1 2 3 Name VDHC VIN FB Description Proprietary control input from LM3432 Source input voltage Feedback pin Error amplifier output and PWM parator input Application Information This pin accepts a control signal from LM3432 to adjust the output voltage in real...