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A6984 Datasheet(PDF) 18 Page - STMicroelectronics

Part # A6984
Description  36 V, 400 mA automotive synchronous step-down switching regulator
PDF  47 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6984 Datasheet(HTML) 18 Page - STMicroelectronics

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Device description
A6984
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DocID030396 Rev 1
Figure 8. fSW variation over the load range
A general requirement for applications compatible with humid environments, is to limit the
maximum resistor value to minimize the resistor variation determined by the leakage path.
An optional external capacitor CTON >> (CINT + CPAR) connected as shown in Figure 9 helps
to limit the RTON value and also minimizes the fSW variation with the p.c.b. parasitic
components CPAR.
Figure 9. TON generator with optional capacitor
Figure 10, Figure 11, Figure 12, and Figure 13 show the numeric example to program the
switching frequency accordingly with the RTON, CTON pair selection.



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