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L7981 Datasheet(PDF) 24 Page - STMicroelectronics |
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L7981 Datasheet(HTML) 24 Page - STMicroelectronics |
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24 / 44 page  Application informations L7981 24/44 Doc ID 15182 Rev 3 6.4.2 Type II compensation network If the equivalent series resistance (ESR) of the output capacitor introduces a zero with a frequency lower than the desired bandwidth (that is: 2 π∗ESR∗COUT>1/BW), this zero helps stabilize the loop. Electrolytic capacitors show not negligible ESR (>30 m Ω), so with this kind of output capacitor the type II network combined with the zero of the ESR allows stabilizing the loop. In Figure 13 the type II network is shown. Figure 13. Type II compensation network The singularities of the network are: In Figure 14 the Bode diagram of the PWM and LC filter transfer function (GPW0 · GLC(f)) and the open loop gain (GLOOP(f) = GPW0 · GLC(f) · GTYPEII(f)) are drawn. f Z1 1 2 π R 4 C 4 ⋅⋅ ------------------------------ = f P0 0 = f P1 1 2 π R 4 C 4 C 5 ⋅ C 4 C 5 + -------------------- ⋅⋅ -------------------------------------------- = ,, |
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