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A7986ATR Datasheet(PDF) 21 Page - STMicroelectronics

Part # A7986ATR
Description  3 A step-down switching regulator for automotive applications
PDF  42 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A7986ATR Datasheet(HTML) 21 Page - STMicroelectronics

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A7986A
Application information
Figure 10. Type III compensation network
In Figure 11, the Bode diagram of the PWM and LC filter transfer function (GPW0 · GLC(f))
and the open loop gain (GLOOP(f) = GPW0 · GLC(f) · GTYPEIII(f)) are drawn.
Figure 11. 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 kΩ and 5 kΩ.
2.
Choose a gain (R4/R1) in order to have the required bandwidth (BW), that means:
Equation 24
where K is the feed-forward constant and 1/K is equal to 18.
3.
Calculate C4 by placing the zero at 50% of the output filter double pole frequency (fLC):
R
4
BW
f
LC
---------- KR
1
⋅⋅
=



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