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TPS92640 Datasheet(PDF) 11 Page - Texas Instruments |
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TPS92640 Datasheet(HTML) 11 Page - Texas Instruments |
11 / 37 page IN OUT OFF ON ON V V T T T D u K CS LED OUT V V V VIN RON UDIM VOUT VREF IADJ COMP SDIM HG SW BOOT VCC LG CS GND SDRV DAP TPS92640/641 PWM *SDIM VIN CIN1 CIN2 RUDIM1 RUDIM2 RUDIM3 CON RON RVOUT2 CVREF RIADJ1 RIADJ2 CCOMP RHG RLG CBOOT DBOOT RF CVCC RCS L QHS QLS *QSDIM COUT RVOUT1 *TPS92641 ONLY TPS92640, TPS92641 www.ti.com SNVS902A – OCTOBER 2012 – REVISED OCTOBER 2015 7.3 Feature Description Figure 13. Synchronous Buck LED Driver 7.3.1 Controlled On-Time Architecture The control architecture is a combination of valley current control and a one-shot on-timer that varies with input and output voltage. The TPS92640 and TPS92641 devices use a series resistor in the LED path to sense both average LED current and valley inductor current. During the time that the high side NFET is turned on (tON), the input voltage charges up the inductor. When it is turned off (tOFF) and the low side NFET is turned on, the inductor discharges. During both intervals, the current is supplied to the load keeping the LEDs forward biased. Figure 14 shows the inductor current (iL) waveform for a buck converter operating in continuous conduction mode (CCM). As the system changes input voltage or output voltage, duty cycle D is varied indirectly by changing both tON and tOFF to regulate IL and ultimately ILED. For any buck regulator, duty cycle, D, is calculated using Equation 1. where • VCS is the voltage measured at the CS pin of the IC and η is the estimated or actual converter efficiency. (1) Copyright © 2012–2015, Texas Instruments Incorporated Submit Documentation Feedback 11 Product Folder Links: TPS92640 TPS92641 |
Similar Part No. - TPS92640_16 |
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Similar Description - TPS92640_16 |
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