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ST1S41 Datasheet(PDF) 11 Page - STMicroelectronics |
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ST1S41 Datasheet(HTML) 11 Page - STMicroelectronics |
11 / 27 page DocID023654 Rev 2 11/27 ST1S41 Functional description The transfer function from FB to Vc (output of E/A) introduces the singularities (poles and zeroes) to stabilize the loop. Figure 5 shows the small signal model of the error amplifier with the internal compensation network. 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 9 where GEA= Gm · Ro. The poles of this transfer function are (if Cc >> C0+CP): Equation 10 Equation 11 whereas the zero is defined as: Equation 12 The embedded compensation network is RC=70 kΩ, CC=195 pF while CP and CO can be considered as negligible. The error amplifier output resistance is 240 M Ω so the relevant singularities are: Equation 13 Co Ro Cc Rc Cp Gm*Vd VFB VREF Vd AM15062v1 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 ⋅⋅ ⋅ ------------------------------------------ = f Z 11.6 kHz f PLF 3.4 Hz = = |
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