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LM3423-Q1 Folha de dados(PDF) 11 Page - Texas Instruments |
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LM3423-Q1 Folha de dados(HTML) 11 Page - Texas Instruments |
11 / 72 page IS AGND PWM Start new on time nDIM COMP REFERENCE CURRENT LIMIT CSH HSN LOGIC HSP EN OVP HYSTERESIS LED CURRENT LOW S R Q UVLO DDRV GATE PGND OVP LRDY RPD EN LatchOff TIMR OVLO FLT LED CURRENT HIGH Regulator Thermal Limit TLIM TLIM OVLO PGND LatchOff Standby Dimming Reset Dominant RCT 800 mV 820k 500k LEB In the LM3421, TIMR is internally shorted to AGND. 1.235V 6.9V LDO (4.1V) DPOL Grey pins are available in the LM 3423 only. LEB 9 = 150 ns VIN/25 VIN UVLO HYSTERESIS 1.24V VCC 1.235V VCC 1.24V 1.24V 0.245V 1.0V 1.6V VCC UVLO VCC VCC UVLO VIN 23 2A 23 2A 11.5 2A LM3421, LM3421-Q1, LM3423, LM3423-Q1 www.ti.com SNVS574F – JULY 2008 – REVISED JULY 2015 7 Detailed Description 7.1 Overview The LM34xx-Q1 are N-channel MOSFET (NFET) controllers 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 LM34xx-Q1 uses a Predictive Off-time (PRO) control architecture that allows the regulator to be operated using minimal external control loop compensation, while providing an inherent cycle-by-cycle current limit. The adjustable current sense threshold provides the capability to amplitude (analog) dim the LED current and the output enable/disable function with external dimming FET driver allows for fast PWM dimming of the LED load. When designing, the maximum attainable LED current is not internally limited because the LM34xx-Q1 is a controller. Instead it is a function of the system operating point, component choices, and switching frequency allowing the LM34xx-Q1 to easily provide constant currents up to 5A. This controller contains all the features necessary to implement a high- efficiency versatile LED driver. 7.2 Functional Block Diagram Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: LM3421 LM3421-Q1 LM3423 LM3423-Q1 |
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