Original question:
TPS54202: What is the current can let TPS54202 exit the ECO mode?
Hi team,
I have two questions:
(1) Minimum on time, measured at 90% to 90% and 1-A loading. What's the meaning of "90% to 90%"? Is the minimum on time for high side MOS or low side MOS or both?
(2) The device implements a current-limit by clamping the error amplifier voltage to a maximum level and also implements a minimum clamp for improved transient-response performance. What's the meaning of minimum clamp and why it can improve transient response?
Br,
Nison Wang
Hi Nison,
(1) The minimum on time is for high side MOS. Measuring method is shown below. Measured from 90% to 90%.
(2) `The minimum clamp relates with pulse skip mode peak inductor current threshold. When the peak inductor current is lower than 300 mA typically, the device enters pulse skipping mode. When the device is in pulse skipping mode, the error amplifier output voltage is clamped which prevents the high side integrated MOSFET from switching. The peak inductor current must rise above 300 mA and exit pulse skip mode.
Best regards
Lucia
