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L6985F Datasheet(PDF) 40 Page - STMicroelectronics |
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L6985F Datasheet(HTML) 40 Page - STMicroelectronics |
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40 / 65 page  Closing the loop L6985F 40/65 DocID027836 Rev 2 where: Equation 30 5.4 Total loop gain In summary, the open loop gain can be expressed as: Equation 31 Example 1 VIN = 12 V VOUT = 3.3 V and ROUT = 6.6 Selecting L = 4.7µH, COUT = 10 µF and ESR = 1 m, RC= 110 k, CC= 68 pF, CP = 1.2 pF (please refer to Example 2), the gain and phase bode diagrams are plotted respectively in Figure 30 and Figure 31. Equation 32 fZ 1 2 R 1 CR1 ----------------------------------------- = fp 1 2 R1 R 2 R1 R2 + -------------------- CR1 ------------------------------------------------------- = fZ fp Gs GDIV s G CO s A 0 s = BW 108kHz = phase margin 64 0 = |
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