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L6986H データシート(PDF) 16 Page - STMicroelectronics

部品番号 L6986H
部品情報  38 V, 2 A synchronous step-down switching regulator with 30 μA quiescent current
PDF  68 Pages
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メーカー  STMICROELECTRONICS [STMicroelectronics]
ホームページ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6986H データシート(HTML) 16 Page - STMicroelectronics

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Figure 8. External soft-start network VSTEP driven
The circuit in Figure 7. Enable the device with external voltage step introduces a time delay between VSTEP and
the switching activity that can be calculated as:
TSS=CSS⋅RSS_EQ⋅In( VSS_FINAL
VSS_FINAL−VSS START)
(11)
Figure 9. External soft-start after UVLO or thermal shutdown shows how the device discharges the soft-start
capacitor after an UVLO or thermal shutdown event in order to restart the switching activity ramping the error
amplifier reference voltage.
Figure 9. External soft-start after UVLO or thermal shutdown
L6986H
Soft-start and inhibit
DS12905 - Rev 2
page 16/68



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