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A7985ATR датащи(PDF) 26 Page - STMicroelectronics

номер детали A7985ATR
подробное описание детали  2 A step-down switching regulator for automotive applications
PDF  44 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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A7985ATR датащи(HTML) 26 Page - STMicroelectronics

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Application information
A7985A
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DocID023128 Rev 5
In Figure 14 the Bode diagram of the PWM and LC filter transfer function (GPW0 · GLC(f))
and the open loop gain (GLOOP(f) = GPW0 · GLC(f) · GTYPEII(f)) are drawn.
Figure 14. Open loop gain: module Bode diagram
The guidelines for positioning the poles and the zeroes and for calculating the component
values can be summarized as follows:
1.
Choose a value for R1, usually between 1 k and 5 k, in order to have values of C4
and C5 not comparable with parasitic capacitance of the board.
2.
Choose a gain (R4/R1) in order to have the required bandwidth (BW), that means:
Equation 31
where fESR is the ESR zero:
Equation 32
and VS is the sawtooth amplitude. The voltage feed-forward keeps the ratio VS/VIN constant.
3.
Calculate C4 by placing the zero one decade below the output filter double pole:
Equation 33
R4
fESR
fLC
------------


2
BW
fESR
------------
VS
VIN
--------- R1

=
fESR
1
2
 ESR C
OUT

--------------------------------------------
=
C4
10
2
 R
4 fLC

-------------------------------
=



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