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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LED2001PUR датащи(PDF) 12 Page - STMicroelectronics |
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LED2001PUR датащи(HTML) 12 Page - STMicroelectronics |
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12 / 42 page  Application notes LED2001 12/42 DocID024346 Rev 1 6 Application notes 6.1 Closing the loop Figure 5. Block diagram of the loop 6.2 GCO(s) control to output transfer function The accurate control to output transfer function for a buck peak current mode converter can be written as: Equation 1 where R0 represents the load resistance, Ri the equivalent sensing resistor of the current sense circuitry, ωp the single pole introduced by the LC filter and ωz the zero given by the ESR of the output capacitor. FH(s) accounts for 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. VIN - + - LC filter VREF error amplifier FB compensation network PWM comparator HS switch RS L COUT RC CC + PWM control Current sense LS switch VOUT VCONTROL G CO(s) A O(s) α LED G CO s () R 0 R i ------- 1 1 R 0 T SW ⋅ L ----------------------- m C 1D – () 0.5 – ⋅ [] ⋅ + ---------------------------------------------------------------------------------------- 1 s ω z ------ + 1 s ω p ------ + ---------------------- FH s () ⋅⋅ ⋅ = |
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