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LM3424 Datasheet(PDF) 11 Page - Texas Instruments |
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LM3424 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 69 page  IS PWM Clock nDIM COMP REFERENCE CURRENT LIMIT CSH HSN HSP EN OVP HYSTERESIS S R Q UVLO DDRV GATE GND OVP OVLO Regulator Thermal Limit TLIM OVLO Standby Dimming Reset Dominant RT 820k LEB 1.24V 6.9V LDO (4.1V) LEB 9 = 240 ns UVLO HYSTERESIS 1.24V VCC 1.24V VCC 1.24V 0.245V VCC VCC UVLO VIN 20 2A 20 2A Oscillator 10 2A 90k 1.7k 100k 100k 100k 100k 100k 100k 1.24V 10 2A COMP STANDBY Artificial Ramp VS TREF TSENSE TGAIN SS SLOPE LM3424, LM3424-Q1 www.ti.com SNVS603C – AUGUST 2009 – REVISED AUGUST 2015 7 Detailed Description 7.1 Overview The LM3424 is an N-channel MOSFET (NFET) controller for buck, boost and buck-boost current regulators which are ideal for driving LED loads. The controller has wide input voltage range allowing for regulation of a variety of LED loads. The high-side differential current sense, with low adjustable threshold voltage, provides an excellent method for regulating output current while maintaining high system efficiency. The LM3424 uses peak current mode control providing good noise immunity and an inherent cycle-by-cycle current limit. The adjustable current sense threshold provides the capability to amplitude (analog) dim the LED current and the thermal foldback circuitry allows for precise temperature management of the LEDs. The output enable/disable function coupled with an internal dimming drive circuit provides high speed PWM dimming through the use of an external MOSFET placed at the LED load. When designing, the maximum attainable LED current is not internally limited because the LM3424 is a controller. Instead it is a function of the system operating point, component choices, and switching frequency allowing the LM3424 to easily provide constant currents up to 5A. This simple controller contains all the features necessary to implement a high efficiency versatile LED driver. 7.2 Functional Block Diagram Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3424 LM3424-Q1 |
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