SLVSF07 July 2021 TPS7H5001-SP
A resistor from the RT pin to AVSS sets the switching frequency of the device. The TPS7H5001-SP controller has a switching frequency range of 100 kHz to 2 MHz. In internal oscillator mode, the RT pin must be populated or the controller will not perform any switching. Equation 7 shows the calculation determining the RT value for a desired switching frequency. The curve in Figure 7-3 shows the RT value that corresponds to a given switching frequency for the TPS7H5001-SP.
In this mode, the SYNC pin is configured as an output and produces a clock signal with a frequency that is twice that of the switching frequency set by RT. As such, this clock signal has a range of 200 kHz to 4 MHz. This SYNC output clock signal is in phase with the switching frequency of the device. Figure 7-4 shows typical waveforms for the controller in this mode of operation.