SLVSDA7E February 2017 – August 2019 TPS61178
The TPS61178x features of a wide adjustable switching frequency ranging up to 2.2 MHz. The switching frequency is set by a resistor connecting with the FREQ / SYNC pin. This pin cannot be left floating in the application. Use Equation 2 and Equation 3 to calculate the resistor value for a desired frequency.
For instance, if the RFREQ is 342 kΩ, the frequency is 500 kHz.
Figure 21 shows the switching frequency versus the setting resistor, which is measured with VOUT = 16 V from VIN = 7.2 V .