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ST1S32PUR Folha de dados(PDF) 10 Page - STMicroelectronics |
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ST1S32PUR Folha de dados(HTML) 10 Page - STMicroelectronics |
10 / 29 page Functional description ST1S32 10/29 Doc ID 023246 Rev 1 Equation 3 where: Equation 4 Sn represents the ON-time slope of the sensed inductor current, Se the slope of the external ramp (VPP peak-to-peak amplitude - 0.535 V) that implements the slope compensation to avoid sub-harmonic oscillations at duty cycle over 50%. The sampling effect contribution FH(s) is: Equation 5 where: Equation 6 and Equation 7 The transfer function GDIV(s) from VOUT to FB results: The transfer function from FB to Vc (output of E/A) introduces the singularities (poles and zeroes) to stabilize the loop. In Figure 5, the small signal model of the error amplifier with the internal compensation network is shown. ω p 1 R LOAD C OUT ⋅ ---------------------------------------- m C 1D – () 0.5 – ⋅ LC OUT f SW ⋅⋅ ------------------------------------------------ + = m C 1 S e S n ------ + = S e V pp f SW ⋅ = S n V IN V OUT – L ------------------------------ R i ⋅ = ⎝ ⎜ ⎜ ⎜ ⎜ ⎜ ⎜ ⎛ F H s () 1 1 s ω n Q P ⋅ --------------------- s 2 ω n 2 ----- ++ ------------------------------------------- = Q P 1 π m C 1D – () 0.5 – ⋅ [] ⋅ ---------------------------------------------------------------- = ω n π f SW ⋅ = G DIV s () R 2 R 1 R 2 + -------------------- = |
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