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L6983 Datasheet(PDF) 33 Page - STMicroelectronics

Part # L6983
Description  38 V, 3 A synchronous step-down converter with 17 μA quiescent current
PDF  63 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6983 Datasheet(HTML) 33 Page - STMicroelectronics

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COUT,min,RIPPLE= ∆IL,MAX
8∙∆VOUT∙FSW
(43)
As the compensation network is internal, the output capacitor should be selected in order to have a proper phase
margin and then a stable control loop. A good rule to obtain a proper dimensioning for the minimum amount of the
output capacitor is set the target system bandwidth equal to FSW/8. The following equation keep into account the
precedent consideration:
COUT,BW,min= 8.04
Fsw8∙VOUT
(44)
The maximum amount of the output capacitor is given by:
COUT,BW,MAX=0.960∙10−3
VOUT
(45)
L6983
Design of the power components
DS13116 - Rev 2
page 33/63



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