Team,
Can we guarantee a min max duty cycle @ 400KHz ? datasheet only provides a typ at 2.2MHz. customer has to be able to work at low vin.
thanks
Hello,
What is the customer's end application and power condition?
If the device is operating close to dropout, the switching frequency will generally start to foldback to maintain output regulation.
Once the device enters dropout mode, the output voltage will linearly drop and scale down with the input voltage minus a diode drop.
Also note that it is dependent on output current loading. Please see below for dropout curve for reference.
The min/max duty cycle is dependent on the minimum on-time and off-time of the device.
Below is the calculation I did for 5Vout|400kHz
Keeping VOUT = 5V and FSW = 400kHz, I simply scaled the VIN to check if both Ton and Toff is within the Ton_min and/or Toff_min spec.
