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L7986 数据表(PDF) 22 Page - STMicroelectronics |
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L7986 数据表(HTML) 22 Page - STMicroelectronics |
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22 / 43 page  Application information L7986 22/43 DocID022450 Rev 6 Equation 27 The suggested maximum system bandwidth is equal to the switching frequency divided by 3.5 (FSW / 3.5), anyway, lower than 100 kHz if the FSW is set higher than 500 kHz. For example, with VOUT = 5 V, VIN = 24 V, IO = 3 A, L = 18 H, COUT = 22 F, ESR < 1 m, the type III compensation network is: In Figure 12 the module and phase of the open-loop gain is shown. The bandwidth is about 58 kHz and the phase margin is 50°. R3 R1 4BW fLC ----------------- 1 – --------------------------- = C3 1 2 R 3 4BW ----------------------------------------- = R1 4.99k = R2 680 = R3 200 = R4 2k = C3 3.3nF = C4 22nF = C5 220pF = |
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