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A6986H Datasheet(PDF) 18 Page - STMicroelectronics

Part # A6986H
Description  Automotive 38 V, 2 A synchronous step-down switching regulator with 30 μA
PDF  71 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6986H Datasheet(HTML) 18 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
A6986H
Soft-start and inhibit
DS12861 - Rev 3
page 18/71



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