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AN557 データシート(PDF) 18 Page - STMicroelectronics |
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AN557 データシート(HTML) 18 Page - STMicroelectronics |
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18 / 52 page  AN557 APPLICATION NOTE 18/52 Figure 20. Frequency behaviour of the circuit of fig. 19 The system requires that DC gain is maximum to achieve good accuracy and line rejection. Beyond this a bandwidth of some KHz is usually required for a good load transient response. The error amplifier trans- fer function must guarantee the above constrainst. A compensation network that could be used is shown in fig. 21. Figure 21. Compensation network. Figure 22. Bode plot of the regulation loop with the compensation network of fig. 21. As () 1sR1 C1 + () 1sR2C2 + () sR1 C1 (1+s C1 Gm ---------- ---------------------------------------------------------------------- = ACSJ Gloop PWM+FILTER 50Hz 500Hz 5Kz 50KHz 20 40 dB D93IN012 |
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