SLLA549 July   2021 TCAN4550 , TCAN4550-Q1 , TCAN4551-Q1

 

  1.   1
  2.   2
  3.   3
  4.   4
  5.   5
  6.   6
  7.   7
  8.   8
  9.   9
  10.   10
  11.   11
  12.   12
  13.   13
  14.   14
  15.   15

12 Recalculate Critical Transconductance and Gain Margin

If a series dampening resistor is used, the critical transconductance gmcrit and gain margin needs to be recalculated to ensure there is still enough gain margin to start and maintain oscillation.

Equation 33. g m c r i t _ w i t h _ R d = 4   × R l o a d +   R d   ×     ω 2   ×   ( C 0 + C L ) 2
Equation 34. G a i n m a r g i n _ w i t h _ R d =   g m g m c r i t _ w i t h _ R d