SLUSEA4D June 2021 – August 2022 TPS62932 , TPS62933 , TPS62933F , TPS62933O , TPS62933P
PRODUCTION DATA
The switching frequency is set by the condition of the RT input. The condition of this input is detected when the device is first enabled. Once the converter is running, the switching frequency selection is fixed and cannot be changed until the next power-on cycle or EN toggle. Table 9-1 shows the selection programming. In adjustable frequency mode, the switching frequency can be set between 200 kHz and 2200 kHz by proper selection of RT resistor. See Equation 2.
where
RT Pin | Resistance | Switching Frequency |
---|---|---|
Floating | > 280 kΩ | 500 kHz |
GND | < 1 kΩ | 1200 kHz |
RT to GND | 8.9 kΩ to 111 kΩ | 200 kHz to 2200 kHz |
Figure 9-3 indicates the required resistor value for RT to set a desired switching frequency.
There are four cases where the switching frequency does not conform to the condition set by the RT pin: