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TPS54240 - About inverting buck-boost topology

Guru 21045 points
Other Parts Discussed in Thread: TPS54240

Hi Team,

 

I would like to use the inverting buck-boost of TPS54240 at the following conditions.

 

[Condition]

Vin=3.3V to 4.5V

Vout=-15V

Iout=250mA

 

I’m understanding that we can design the circuit constant by using " SLVA317B".

http://www.ti.com/lit/an/slva317b/slva317b.pdf

However, could you please let us know if you have the calculation tool of the circuit constant?

 

And, I would like to use the PSM(Plus Skip Mode) of TPS54240 at the light load (around 10mA).

Therefore, I would like to know the current value to enter the PSM.

Could you please let us know if you have the calculating formula of this current?

(this calculating formula is not mentioned in “SLVA317B”)

 

Regards,

Kanemaru