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SC190DEVB Datasheet(PDF) 9 Page - Semtech Corporation |
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SC190DEVB Datasheet(HTML) 9 Page - Semtech Corporation |
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9 / 18 page  9 2005 Semtech Corp. www.semtech.com POWER MANAGEMENT SC190 Applications Information (Cont.) Output Filter The SC190 series of synchronous step-down converters have internal loop compensation. The internal compensation is designed to work with a certain output filter corner frequency defined by the equation: The internal compensation is optimized to operate with an output filter, L=4.7µH & COUT = 10µF. When selecting output filter components the LC product should not vary over a wide range. Table 1: Output Filter combinations L(µH) C OUT(µF) 4.7 4.7 4.7 10 10 10 Inductor Selection As previously stated the value of the inductor should be in the range 4.7µH to 10µH. The magnitude of the inductor current ripple is dependant on the inductor value and can be determined by the following equation: This equation demonstrates the relationship between V IN,VOUT & IL. The inductor ripple current decreases with higher inductance & increases with higher V IN or VOUT . To maximize efficiency the inductor should have a low DCR to minimize the conduction losses. As a minimum requirement the DC current rating of the inductor should be equal to the maximum load current plus half of the inductor current ripple and can be determined by the following equation: The selection of smaller inductor & capacitor values will move the corner frequency, having an impact on system stability. Due to this issue the practical lower limit for the inductor value is 4.7µH. Alternatively, set the inductor saturation current to be greater than the switch current limit as a maximum limit. I SAT > PMOS. Final inductor selection will depend on various design considerations such as efficiency, EMI, size and cost. Table 2 lists the manufacturers of practical inductor options. Table 2 - Recommended Inductors Manufacturer Part Number Value (µH) DCR (Ω) Rated Current (A) Saturation Current (A) Tolerance % Dimensions (LxWxH mm) TDK LDR655312T-4R7W 4.7 0.206 0.9 - 20 6.5 x 5.3 x 1.2 Sumida CDRH3D16LD 4.7 0.073 0.68 - 30 4 x 4 x 1.8 Taiyo Yuden LMNP04SB100M 10 0.066 0.9 - 20 5 x 5 x 2 Coilcraft LPS3015 10 0.044 - 0.65 20 3 x 3 x 1.5 Coilcraft LP06610-103M 10 0.41 - 0.8 20 6.9 x 3.8 x 1.0 C L 2 1 fc • π = f L Vi Vo 1 Vo IL • − = ∆ 2 IL (max) Iout ILpk ∆ + = |
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