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L6981 Datasheet(PDF) 28 Page - STMicroelectronics

Part # L6981
Description  38 V, 1.5 A synchronous step-down converter with low quiescent current
PDF  49 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L6981 Datasheet(HTML) 28 Page - STMicroelectronics

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COUT,min,RIPPLE= ∆IL,MAX
8∙∆VOUT∙FSW
(40)
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 to set the target system bandwidth equal to FSW/10. The following equation takes into account
the precedent consideration:
COUT,BW,min= 8.04
FSW10∙VOUT
(41)
The maximum amount of the output capacitor is given by:
COUT,BW,min=1.38∙10−4
VOUT
(42)
L6981
Design of the power components
DS13554 - Rev 1
page 28/49



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