TS3552
2A/350kHz Synchronous Buck DC/DC Converter
7/11
Version: B11
Application Information (Continue)
Loop Compensation
The system has one zero of importance, due to the compensation capacitor, Cc and the compensation resistor, Rc.
This zero is located at:
The system may have another zero of importance, if the output capacitor has a large capacitance and/or a high
ESR value. The zero, due to the ESR and capacitance of the output capacitor, is located at:
In this case, a third pole set by the compensation capacitor, C7 and the compensation resistor, Rc is used to
compensate the effect of the ESR zero on the loop gain. This pole is located at:
The values of the compensation components given in this data sheet yield a stable control loop for the given output
voltage and capacitor. If different conversions and output capacitors are requires, some values of the
compensation components may need to be adjusted to ensure stability.
