In attached Switcher Pro report.
Power dissipation of TPS622313 is 365mW.
In this calculation of power disipation, what is the Rds(on)?
Are the equations in datasheet P.39 used on Switcher Pro?
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In attached Switcher Pro report.
Power dissipation of TPS622313 is 365mW.
In this calculation of power disipation, what is the Rds(on)?
Are the equations in datasheet P.39 used on Switcher Pro?
Sorry, I filled out wrong device name.
TPS54160 is correct.
Kohei,
Rds(on) is the on resistance of the internal FET (high side). For the TPS54160, it is approximately 200mOhms.
In the Switcher Pro report, it shows Rds(on) of 204 mOhm.
I'll let the Switcher Pro experts comment on the equations being used.
Britt
Is the 204 mohm Rds(on) used in calculation of device power dissipation?
How much accuracy is the power dissipation calculation?
Is it typical case or worst case?
In Switcher Pro report, max temperature of device is 43[degC].
I think this means device produces heat 18[degC].
Because device power is 365mW, I think thermal resistance is 49.315[degC/W].
How is this thermal resistance calculated?
There is no this value in datasheet.
Dear Kohei-San,
The Rdson in the SwitcherPro tool is a complex function of gate voltage & temperature. The actual value of Rdson is computed considering the temperature of the IC/FET and the gate voltage drive. Hence, we cannot give one single number. We calibrate the power dissipation carefully to a lot of actual data to accurately to come up the parameters for FET's. SwitcherPro implementation is more complex than the equations given in data-sheet.
By the way, this device in WEBENCH(R) Power Designer too.
Thanks.