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TPS92641PWPR Fiches technique(PDF) 10 Page - Texas Instruments |
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TPS92641PWPR Fiches technique(HTML) 10 Page - Texas Instruments |
10 / 37 page H.S. Driver VCC SW BOOT End tON SDIM VOUT RON UDIM CS VIN GND OVP SD HG SDRV VREF VOLTAGE REFERENCES 370mV 1.276V 2.54V 3.03V VCC BIAS REGULATOR VIN VCC VDD VCC UVLO THERMAL SHUTDOWN LOGIC GATE DRIVE UVLO VSW Q Q R S DEAD TIME / LEVEL SHIFT VSW tON tOFF LGATE Enable DEAD TIME VCC LG TPS92640, TPS92641 VCC + - 3.05V + - LEB TIMER tON_Reset tON_ Reset TPS92641 ONLY IADJ COMP L.S. Driver + - 1.276V PWM_DIM / UVLO 21µA + - + - PWM_DIM 9R R 2.54V EA FSW + - VDD 1.276V PWM LOGIC + - 370mV 13ms FILTER Shutdown TPS92640, TPS92641 SNVS902A – OCTOBER 2012 – REVISED OCTOBER 2015 www.ti.com 7 Detailed Description 7.1 Overview The TPS92640 and TPS92641 devices are synchronous N-channel MOSFET (NFET) controllers for step-down (buck) current regulators, which are ideal for driving LED loads. They can accept wide input voltage range allowing for greater flexibility in powering different series connected LED string combinations. The single current sense pin with low adjustable threshold voltage provides an excellent method for regulating LED current while maintaining high system efficiency. The TPS92640 and TPS92641 devices use valley current control with a controlled on-time architecture that allows the converter to be operated at nearly constant switching frequency without the need for slope compensation. The extremely accurate adjustable current sense threshold together with the synchronous operation provides the capability to amplitude (analog) dim the LED current with high contrast ratios. Excellent PWM dimming is attainable using the main NFETs or the external shunt FET driver (TPS92641 only). The TPS92640 and TPS92641 devices incorporate 2- Ω, 1-A internal gate drivers and supports constant current operation up to 5 A. This simple controller contains all the features necessary to implement a high-efficiency, versatile LED driver with precise dimming response. 7.2 Functional Block Diagram 10 Submit Documentation Feedback Copyright © 2012–2015, Texas Instruments Incorporated Product Folder Links: TPS92640 TPS92641 |
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