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TPS92515HVDGQT Datasheet(PDF) 10 Page - Texas Instruments |
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TPS92515HVDGQT Datasheet(HTML) 10 Page - Texas Instruments |
10 / 39 page tON tOFF VIADJ and RSENSE adjust the peak inductor current The Inductance (L) and tOFF define 'IL-PP ILave = ILED = IL-Peak ± (ûIL-PP / 2) IL-Peak = [ VIADJ /10 ] / RSENSE ûIL-PP = (VLED * tOFF ) / L The average output current equals the peak minus half the peak to peak inductor ripple t 10 TPS92515, TPS92515-Q1, TPS92515HV, TPS92515HV-Q1 SLUSBZ6A – APRIL 2016 – REVISED AUGUST 2016 www.ti.com Product Folder Links: TPS92515 TPS92515-Q1 TPS92515HV TPS92515HV-Q1 Submit Documentation Feedback Copyright © 2016, Texas Instruments Incorporated 8.3 Feature Description 8.3.1 General Operation The TPS92515 operates using a peak-current, constant OFF-time as described in Figure 11. Two states dictate the high-side FET control. The switch turns on and stays on until the programmed peak current is reached. The peak current is controlled by monitoring the voltage across the sense resistor. When the voltage drop is higher than the programmed threshold, the peak current is reached, and the switch is turned OFF, which initiates the OFF-time period. A capacitor on the COFF pin is then charged through a resistor connected to the output. When the COFF pin voltage reaches the 1-V (typical) threshold, the OFF-time ends. The COFF pin capacitor resets and the main switch turns ON, and the next cycle begins. Figure 11. Hysteretic Operation Although commonly referred to as constant OFF-time, the OFF-time control voltage is normally derived from the output voltage. This connection ensures constant peak-to-peak ripple. To maintain a constant ripple over various input and output voltages, the converter OFF-time becomes shorter or longer resulting in a change in frequency. If the input voltage and output voltage are relatively constant, the frequency also remains constant. If either the input voltage or the output voltage changes, the frequency changes. For a fixed input voltage, the device operates at the maximum frequency at 50% duty cycle and the frequency reduces as the duty cycle becomes shorter or longer. A graphical representation is shown in Figure 12. For a fixed output voltage (VLED), the frequency is always the maximum at the highest input voltage as shown in Figure 13. |
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