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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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SC416 датащи(PDF) 22 Page - Semtech Corporation |
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SC416 датащи(HTML) 22 Page - Semtech Corporation |
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22 / 34 page  SC416 22 The schematic with added capacitor C is shown below. R1 R2 To FB C COUT VOUT Figure 14 This capacitor should be left out until confirmation that double-pulsing exists. It is best to leave a spot on the PCB in case it is needed. FB/VOUT Ripple Because the constant on-time control method triggers a DH pulse whenever the FB waveform reaches the 750mV trip point, it is important that the VOUT and FB ripple waveforms are well shaped. This waveform will depend on the output capacitors. The idealized case for the output filter has an inductor and a capacitor COUT with series ESR. The voltage ripple due to charging and discharging COUT is typically much smaller than the ripple voltage due to ESR, so the over- all ripple waveform is generally determined by ESR only. The result is a well-defined sawtooth, see Figure 15. Applications Information (continued) Figure15 In many applications, the output capacitor also has some series inductance (ESL), and this can have a large effect on ripple. The ripple current creates voltage across the ESL; this is a square wave similar to the LX waveform. The result is shown below. Note the fast rising and falling edges created by the ESL. R1 R2 To FB COUT VOUT LOAD LX ESR Inductor Ripple Current VOUT ripple from ESR FB ripple 750 mV |
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