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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AN557 датащи(PDF) 17 Page - STMicroelectronics |
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AN557 датащи(HTML) 17 Page - STMicroelectronics |
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17 / 52 page  17/52 AN557 APPLICATION NOTE It must be remembered, however, that because of the high output impedance of the error amplifier, a sec- ond pole is also present: 18) We normally suggest a high value for R1 to reduce the value of the capacitor C1 and allocate the pole P2 at the highest possible frequency. The essential limitation to the max value of R1 is the offset introduced by the input bias current of the error amplifier. In the case of output voltage regulated higher than 5.1V, an external divider should be introduced. It’s than possible to introduce a second zero using the following net- work: Figure 18. Compensation network for output voltages higher than 5.1V Two zeros and two poles are introduced: 19) Where APPLICATION EXAMPLE Consider the block diagram of fig. 19, representing the internal control loop section, with the application values: Fswitch = 200KHz, L = 100 µH, C = 1000µF, Po = 50W, Vo = 5.1V, Io = 10A and Fo = 500Hz. Gloop = PWM × Filter Figure 19. Block diagram used in stability calculation P2 Gm 2 Π C1 ------------------ = Z1 1 2 Π R o Cc --------------------------- Z2 1 2 Π R1 C1 ----------------------------- = = P1 1 2 Π R o Cc --------------------------- P2 1 2 Π Rx C1 ----------------------------- = = Rx R1 R 2 ⋅ R1 R2 + ---------------------- = |
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