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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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L6364 датащи(PDF) 39 Page - STMicroelectronics |
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L6364 датащи(HTML) 39 Page - STMicroelectronics |
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39 / 60 page  This results in a constant current output behavior with a variable frequency switching (see Figure 16). The operating current and external components should be chosen to avoid this behavior under normal conditions. Figure 16. Overcurrent operation Coil Current ILIMIT time time IOPMAX ILIMIT IOP 1/fSET active active waiting waiting a) Overcurrent operation b) Normal operation For coil protection purposes, the maximum duty is further limited by the L6364 in relation to the supply voltage so that the maximum coil current rise in one cycle is limited to: DMAX ≾ 19.2 V / VVPLUS ⇒ Δ I ≾ 19.2V / (fSET × LCOIL) For fSET= 1 MHz, LCOIL= 220 μH ⇒ ΔI<=87mA. 17.4.3 Capacitive blocking of DOUT CDOUT provides capacitive isolation of the VPLUS supply from the DC-DC regulator. A minimum value, see Table 5. Receiver CQ/DIO, is required to correctly supply the transient currents when the DC-DC converter switches pin LOUT, and at low output currents where there is a negative current in the coil in part of the cycle. The value may, however, be increased to provide additional isolation from input voltage ripple on VPLUS. L6364 Converter external component consideration DS13363 - Rev 4 page 39/60 |
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