Inpact of input current spikes on real applications

AN4587

12/14

DocID026923 Rev 1

We can deduce the maximum capacitance, Cg, to guarantee the stability of the TSZ121

using Equation 9.

Equation 9

In this application:

•

GBP = 400 kHz

•

Rg = 100 Ω

•

Rf = 10 kΩ

Therefore, the maximum capacitance does not exceed Cg = 406 nF.

Cgmax

Rf Rg

+

()

2

2

π GBP Rf Rg

2

⋅⋅

⋅

-----------------------------------------------------------

=

(9)