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A6984 データシート(PDF) 33 Page - STMicroelectronics |
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A6984 データシート(HTML) 33 Page - STMicroelectronics |
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33 / 47 page  DocID030396 Rev 1 33/47 A6984 Device description 47 4.8 PGOOD The internal circuitry monitors the regulated output voltage and keeps the PGOOD open collector output in low impedance as long as the feedback voltage is below the VPGD L threshold (see Table 5 on page 7). Figure 26. PGOOD behavior during soft-start time with electronic load The PGOOD is driven low impedance if VFB = VCC (internal voltage divider, see Section 4.1 on page 13) and VBIAS > VPGD H threshold (see Table 5). The VPGD H threshold has no effect on PGOOD behavior in case the external voltage divider is being used. 4.9 Overvoltage protection The overvoltage protection monitors the FB pin and enables the low-side MOSFET to discharge the output capacitor if the output voltage is 20% over the nominal value. A new soft-start takes place after the OVP event ends. |
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