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TPS61040 with Cascode Transistor

Hi Folks,

I have a customer that is very interested in using this chip based on Application Report SLVA209-May 2005-TPS61040 in High Voltage Applications. However, for some of their applications, the dynamics of the charge output capacitor is too low.

Ideally, they need to get time of transient process ~ 0.5ms for charge output capacitor Vout=180V;

The dynamics of the chip can be improved by selecting an optimal MOSFET transistor...

To select a MOSFET transistor the important equations are 2 and 3 (Application Report SLVA209–May 2005). These equations are not estimated by the following parameters: Ion, Vdg2on


Do you have any ideas to assist in determining these parameters based on
application Report SLVA209–May 2005?

SLVA209.pdf