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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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PM6681ATR 데이터시트(PDF) 38 Page - STMicroelectronics |
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PM6681ATR 데이터시트(HTML) 38 Page - STMicroelectronics |
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38 / 47 page  Design guidelines PM6681A 38/47 Equation 36 Example: OUT1 = 1.5 V, fSW = 290 kHz, L = 2.5 µH, Cout = 330 µF with Rout ≈ 12 mΩ. We design RESR = 12 mΩ. We choose CINT = 1 nF by equations 31, 34 and Cfilt = 47 pF, RINT = 1 kΩ by eq.28, 29. C = 5.6 nF by Eq.35. Then R = 36 k Ω (eq.36) and R1 = 3 kΩ (eq.37). 9.7 Other parts design ● VIN filter. A VIN pin low pass filter is suggested to reduce switching noise. The low pass filter is shown in the next figure: Figure 41. VIN pin filter Typical components values are: R = 3.9 Ω and C = 4.7 µF. ● VCC filter. A VCC low pass filter helps to reject switching commutations noise: Figure 42. Inductor current waveforms Z Z f C 1 R f C 1 R 1 R × π × − ⎟⎟ ⎠ ⎞ ⎜⎜ ⎝ ⎛ × π × × = V VC C C C R R C C L LD D O O5 5 |
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