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A6984 датащи(PDF) 25 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) 25 Page - STMicroelectronics

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A6984
Device description
47
In the CCM operation, the average value for the triangular signal in Equation 15 is:
Equation 16
so the output voltage is calculated as:
Equation 17
that shows the average injected ripple entered in the divider calculation.
In addition, since the virtual FB ripple depends on the input voltage (the switching frequency
is almost constant, see Section 4.2 on page 16) its contribution affects the average output
voltage regulation.
In the low noise mode (for LNM operation refer to Section 4.6.2 on page 31) the regulator
operates in the forced PWM over the load range so:
Equation 18
and the accuracy can be estimated as:
Equation 19
In the low consumption mode (for LCM operation refer to Section 4.6.1 on page 31) the
regulator skips pulses at light load to increase the efficiency.
VFB
AVG VIN

1
2
---
V
IN
V
OUT
–
R
COT
C
COT
----------------------------------
V
OUT
V
IN
--------------
1
fsw
---------

=
V
OUT
0.9
VFB
AVG VIN

+
 1
R
3
R
2
-------
+


=
V
OUTMIN
0.9
VFB
AVG VINMIN

+
 1
R
3
R
2
-------
+


=
V
OUTMAX
0.9
VFB
AVG VINMAX

+
 1
R
3
R
2
-------
+


=
V
OUT
LNM
–
1
2
---
V
OUT
fsw R
COT
C
COT

------------------------------------------------


V
INMAX
V
OUT
–
V
INMAX
---------------------------------------
V
INMIN
V
OUT
–
V
INMIN
-------------------------------------
–


1
R
3
R
2
-------
+



=



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