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ST1S50 Datasheet(PDF) 10 Page - STMicroelectronics |
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ST1S50 Datasheet(HTML) 10 Page - STMicroelectronics |
10 / 29 page Functional description ST1S50 10/29 DocID025723 Rev 4 In Figure 4 is shown the simple small signal model for the peak current mode control loop. Figure 4. Block diagram of the loop for the small signal analysis Three main terms can be identified to obtain the loop transfer function: 1. From control (output of E/A) to output, GCO(s). 2. From output (VOUT) to FB pin, GDIV(s). 3. From FB pin to control (output of E/A), GEA(s). The transfer function from control to output GCO(s) results: Equation 1 where RLOAD represents load resistance, Ri the equivalent sensing resistor of the current sense circuitry, p the single pole introduced by the LC filter and z the zero given by the ESR of the output capacitor. FH(s) accounts the sampling effect performed by the PWM comparator on the output of the error amplifier that introduces a double pole at one half of the switching frequency. Equation 2 L Cout Current sense Logic And Driver Slope Compensation PWM comparator Error Amp Rc Cc R1 R2 0.8V High side Switch Low side Switch GCO(s) GDIV(s) GEA(s) VIN VC VOUT VFB GCO s RLOAD Ri ------------------ 1 1 Rout TSW L ---------------------------- mC 1D – 0.5 – + --------------------------------------------------------------------------------------------- 1 s z ------ + 1 s p ------ + ---------------------- FH s = Z 1 ESR COUT ------------------------------- = |
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