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TPS61166DSKT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS61166DSKT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 18 page V 1V/div,18Voffset O InductorCurrent 100mA/div t- Time=4ms/div V 5V/div O LEDCurrent 50mA/div InductorCurrent 200mA/div t- Time=2ms/div V 5V/div O LEDCurrent 50mA/div InductorCurrent 200mA/div t- Time=400 s/div m DETAILED DESCRIPTION OPERATION TPS61166 SLVS991 – SEPTEMBER 2009.......................................................................................................................................................................................... www.ti.com OVER VOLTAGE PROTECTION SOFT START UP IN PWM DIMMING Figure 15. Figure 16. SOFT START UP Figure 17. The TPS61166 adopts peak current-mode control with a constant pulse-width-modulation (PWM) frequency of 1.2-MHz. PWM operation turns on the PWM switch at the beginning of each switching cycle. The input voltage is applied across the inductor and the inductor current ramps up. In this mode, the output capacitor is discharged by the load current. When the inductor current hits the threshold set by the error amplifier output, the PWM switch is turned off, and the power diode is forward-biased. The inductor transfers its stored energy to replenish the output capacitor. This operation repeats in the next switching cycle. The error amplifier compares the FB pin voltage with an internal reference, and its output determines the duty cycle of the PWM switching. This closed-loop system requires frequency compensation for stable operation. The device has a built-in compensation circuit that can accommodate a wide range of input and output voltages. To avoid the sub-harmonic oscillation intrinsic to current-mode control, the IC also integrates the slope compensation, which adds an artificial slope to the current ramp. 10 Submit Documentation Feedback Copyright © 2009, Texas Instruments Incorporated Product Folder Link(s): TPS61166 |
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