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A6984 Datasheet(PDF) 26 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) 26 Page - STMicroelectronics

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A6984
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DocID030396 Rev 1
Figure 17. Virtual ESR signal generation in LCM operation at light load
In LCM operation the virtual ripple contributes to the regulated output voltage as follows:
Equation 20
since TPULSE << TBURST at zero loading condition.
So the accuracy can be calculated as:
Equation 21
Equation 18, Equation 19 for the LNM and Equation 20, Equation 21 for the LCM allows
proper dimensioning of the FB voltage divider and virtual ESR contribution given the
acceptable output voltage accuracy over the application input voltage range.
V
OUTMIN
0.9
1
2
--- VFB
RIPPLE
V
IN

T
PULSE
T
BURST
---------------------
+


1
R
3
R
2
-------
+


0.9
1
R
3
R
2
-------
+


=
V
OUTMAX
0.9
VFB
AVG VINMAX

+
 1
R
3
R
2
-------
+


=
V
OUT
LCM
–
VFB
AVG VINMAX
 1
R
3
R
2
-------
+


=



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