JAJSIN7 February 2020 TPS59632-Q1
PRODUCTION DATA.
The problem of overshoot in synchronous buck converters results from the output inductor having a small voltage (VOUT) with which to respond to a transient load release.
With overshoot reduction feature enabled, when the output voltage increases beyond a value that corresponds to a voltage difference between the ISUM voltage and the DROOP pin voltage exceeding the specified OSR voltage (as specified in the Electrical Characteristics table), at the instant that the low-side drivers are turned OFF. When the low-side driver is turned OFF, the energy in the inductor is partially dissipated by the body diodes. As the overshoot reduces, the low-side drivers are turned ON again. Figure 13 shows overshoot reduction by turning off the low-side MOSFET during load transient release.