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A7985ATR Datasheet(PDF) 27 Page - STMicroelectronics

Part # A7985ATR
Description  2 A step-down switching regulator for automotive applications
PDF  44 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A7985ATR Datasheet(HTML) 27 Page - STMicroelectronics

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DocID023128 Rev 5
27/44
A7985A
Application information
44
4.
Then calculate C3 in order to place the second pole at four times the system bandwidth
(BW):
Equation 34
For example, with VOUT = 5 V, VIN = 24 V, IO = 2 A, L = 22 H, COUT = 330 F, and
ESR = 70 m
 the Type II compensation network is:
Equation 35
C5
C4
2
 R
4 C4 4BW
1
–

--------------------------------------------------------------
=
R1 1.1k
=
R2 150
=
R4 4.99k
=
C4 180nF
=
C5 180pF
=




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