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A6984 датащи(PDF) 23 Page - STMicroelectronics

номер детали A6984
подробное описание детали  36 V, 400 mA automotive synchronous step-down switching regulator
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6984 датащи(HTML) 23 Page - STMicroelectronics

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A6984
Device description
47
As a consequence, the injected triangular voltage ripple in the FB is:
Equation 15
that does not depend on the R2, R3, CDC, L and DCR.
A virtual ESR network able to guarantee a peak-to-peak signal higher than 20 mV at the FB
pin removes any duty cycle dithering at the switching node.
Output voltage accuracy and optimized resistor divider
The constant on-time control scheme implements valley output voltage regulation: the
internal comparator monitors the FB voltage cycle-by-cycle and generates a fixed TON pulse
if the sensed voltage drops below the internal voltage reference (VEAFB = 0.9 V typical).
The virtual ESR network generates a signal proportional to the inductor current that is AC
coupled to the FB pin through the CDC capacitor (refer to Section 4.3 for dimensioning rules)
and superimposed on the voltage divider contribution as shown in Figure 16.
VFB
RIPPLE VIN

IL
RIPPLE
ESR
VRT
V
IN
V
OUT
–
R
COT
C
COT
----------------------------------
V
OUT
V
IN
--------------
1
fsw
---------

==



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