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Performance Data and Typical Characteristic Curves
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6.7 Typical Waveforms
spa Ch1: Input voltage; Ch2: SS pin voltage; spa Ch1: Q2 Drain voltage;
spa Ch3: Input current; Ch4: LED current; Time: 10 ms/div spa Ch2: Switch current sense (R15) voltage;
spa Ch4: LED current; Time: 1 µs/div
Figure 19. Soft-Start Sequence
Figure 20. Nominal Operation
spa Ch1: C
OUT
= C24, SEPIC output voltage; spa Ch1: GATE voltage; Ch2: SYNC input, TP2;
spa Ch2: SS pin voltage; Time: 400 ms/div spa Ch3: Switch sense current resistor (R15) voltage, Time: 1 µs/div
Figure 21. Over-Voltage Protection Figure 22. SYNC Operation
spa Ch1: DDRV voltage; Ch2: PWM input, TP3; spa Ch1: DDRV voltage; Ch2: PWM input,
spa Ch3: Switch sense current resistor (R15) voltage; spa Ch3: Switch sense current resistor (R15) voltage;
spa Ch4: LED current; Time: 2 ms/div spa Ch4: LED current; Time: 10 µs/div
Figure 23. PWM Dimming (Duty Cycle = 50 %, Frequency = Figure 24. PWM Dimming (Duty cycle = 50 %, Frequency =
240 Hz) 240 Hz)
14 TPS92691 SEPIC LED Driver Evaluation Board SLVUAL8 – December 2015
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