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ST1S32 Datenblatt(PDF) 11 Page - STMicroelectronics |
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ST1S32 Datenblatt(HTML) 11 Page - STMicroelectronics |
11 / 29 page ST1S32 Functional description Doc ID 023246 Rev 1 11/29 Figure 5. Small signal model for the error amplifier RC and CC introduce a pole and a zero in the open loop gain. CP does not significantly affect system stability and can be neglected. So, GEA(s) results: Equation 8 where GEA= Gm · Ro The poles of this transfer function are (if Cc >> C0+CP): Equation 9 Equation 10 whereas the zero is defined as: Equation 11 The embedded compensation network is RC=80 kΩ, CC=55 pF while CP and CO can be considered as negligible. The error amplifier output resistance is 212 M Ω, so the relevant singularities are: Co Ro Cc Cc Cp Gm*Vd VFB VREF Vd Rc AM11419v1 G EA s () G EA0 1s + R c C c ⋅⋅ () ⋅ s 2 R 0 C 0 C p + () R c C c sR 0 C c ⋅ R 0 C 0 C p + () R c C c ⋅ + ⋅ + () 1 + ⋅ + ⋅⋅ ⋅ ⋅ --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- = f P LF 1 2 π R 0 C c ⋅⋅ ⋅ ------------------------------------------ = f P HF 1 2 π R c C 0 C p + () ⋅⋅ ⋅ ------------------------------------------------------------ = f Z 1 2 π R c C c ⋅⋅ ⋅ ------------------------------------------ = |
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