JAJSBF8B June 2011 – April 2018 TPS54478
PRODUCTION DATA.
For the example design, 10.0 kΩ was selected for R7. Using Equation 30, R6 is calculated as 20.0 kΩ. The nearest standard 1% resistor is 20.0 kΩ.
Due to the internal design of the TPS54478, there is a minimum output voltage limit for any given input voltage. The output voltage can never be lower than the internal voltage reference of 0.6 V. Above 0.6 V, the output voltage may be limited by the minimum controllable on time. The minimum output voltage in this case is given by Equation 31:
where
There is also a maximum achievable output voltage which is limited by the minimum off time. The maximum output voltage is given by Equation 32:
where