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Once the on time decreases to tON-MIN, the switching frequency starts to decrease while VIN continues to go up, which lowers the duty cycle further to keep VOUT in regulation according to 式 2. The frequency foldback scheme also works after larger duty cycle is needed under a low VIN ...
Spread spectrum works by converting a narrowband signal into a wideband signal that spreads the energy over multiple frequencies. Since industry standards require different EMI receiver resolution bandwidth (RBW) settings for different frequency bands, the RBW has an impact on the spread spectrum ...
The gate-driver circuit works in conjunction with an external bootstrap capacitor and an internal high-voltage bootstrap diode. A high-quality 2.2-nF, 50-V X7R ceramic capacitor connected between the BST and SW pins provides the voltage to the high-side driver during the buck switch on-time...