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R6986 数据表(PDF) 41 Page - STMicroelectronics |
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R6986 数据表(HTML) 41 Page - STMicroelectronics |
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41 / 62 page  DocID026996 Rev 2 41/62 R6986 Closing the loop 62 where: Equation 35 p is defined by Equation 20 on page 36, gCS represents the current sense transconductance (see Table 5: Electrical characteristics on page 8) and gm TYP the error amplifier transconductance. Equation 36 Example 2 Considering VIN = 12 V, VOUT = 3.3 V, L = 6.8 H, COUT = 15 F, fSW = 500 kHz. The maximum system bandwidth is 80 kHz. Assuming to design the compensation network to achieve a system bandwidth of 70 kHz: Equation 37 Equation 38 so accordingly with Equation 34 and Equation 36: Equation 39 Equation 40 fPOLE p 2 ----------- = CC 5 2 R C BW -------------------------------------- = fPOLE 6kHz = RLOAD VOUT IOUT -------------- 2.2 == RC 68k = CC 168pF 180pF = |
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