SLUU406A February 2010 – January 2022 CSD16322Q5 , CSD16410Q5A , TPS40303 , TPS40304 , TPS40305
The TPS40305EVM-488 is designed with a FSS Enable Jumper (JP1) using a 0.1" spacing header and shunt. Installing a shunt in the JP1 position connects the EN/SS pin to BP via a 267-kΩ resistor (R10) to enable frequency spread spectrum.
Frequency spread spectrum modulates the switching frequency to ±10% of the nominal value at 30 kHz to reduce EMI at the switching frequency and its harmonics, however, there can be a 30-kHz component to the output ripple (see Figure 6-6).
The TPS40305EVM-488 does not dynamically monitor the JP1 status for programming FSS. The TPS40305EVM-488 must be disabled through JP2 or powered down by reducing VIN to less than 3.0 V to remove or install JP1.