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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC2440AEVB датащи(PDF) 25 Page - Semtech Corporation |
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SC2440AEVB датащи(HTML) 25 Page - Semtech Corporation |
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25 / 28 page  25 SC2440A Typical Application Circuits (Continued) C15 8.06k SC2440A GND SS2 IN SW1 FB2 ROSC COMP2 R7 14.7k BST1 BST2 SW2 L1 C2 0.1mF L2 PGOOD2 SS1 PGOOD1 COMP1 FB1 C3 D1 B120 D2 B120 R9 57.6k OUT1 2.5V/1.8A 30.1k R21 R3 20k R2 R1 30.1k C7 22nF C10 22nF C8 5.6nF R5 8.87k C5 3.9nF SYNC L1: Coiltronic DR73 OUT2 0.8V/1.8A C4 0.1mF 47mF 4.7mF C1 22mF 10mH 4.7mH C1: Murata GRM31CR70J226M C15: Murata GRM31CR71C475M 100k R8 C3: Murata GRM32ER70J476M 4.02k R22 L2: Coiltronic DR73 12V ± 10% VIN D3 BAT54 C9 47pF C6 47pF D4 BAT54 Stepping Down to a Voltage Lower Than the Feedback Voltage. (a) 400kHz 12V to 2.5V and 0.8V Step-down Converter. R 3 is a pre-load to shunt the current from R21 and R22 before PGOOD1 releases SS2. (b) Start-up waveform (I OUT1 = IOUT2 = 1A). (c) Channel 2 load regulation is slightly below that of channel 1 becauseV FB2 is derived from V OUT1. Figure 16. (a) 4ms/div V PGOOD2 2V/div V OUT1 0.5V/div V OUT2 0.5V/div (b) V SS2 1V/div (c) |
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