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A7985ATR Datasheet(PDF) 21 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) 21 Page - STMicroelectronics

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DocID023128 Rev 5
21/44
A7985A
Application information
44
In this way the PWM modulator gain results constant and equal to:
Equation 19
The synchronization of the device with an external clock provided through the SYNCH pin
can modify the PWM modulator gain (see Section 5.1 on page 11 to understand how this
gain changes and how to keep it constant in spite of the external synchronization).
Figure 9. The error amplifier, the PWM modulator and the LC output filter
The transfer function on the LC filter is given by:
Equation 20
where:
Equation 21
Equation 22
As seen in Section 5.3 on page 14, two different kinds of network can compensate the loop.
In the two following paragraphs the guidelines to select the Type II and Type III
compensation network are illustrated.
GPW0
VIN
Vs
---------
1
K
----
18
==
=
FB
COMP
V
REF
E/A
PWM
V
S
OUT
V
CC
C
OUT
ESR
L
G
PW0
G
LC
FB
COMP
V
REF
E/A
PWM
V
S
OUT
V
CC
C
OUT
ESR
L
G
PW0
G
LC
GLC s

1
s
2
 f
zESR
--------------------------
+
1
s
2
 Qf
LC
----------------------------
s
2
 f
LC
-------------------

 2
++
-------------------------------------------------------------------------
=
fLC
1
2
LCOUT
1
ESR
ROUT
---------------
+

------------------------------------------------------------------------
=
fzESR
1
2
 ESR C
OUT

--------------------------------------------
=
Q
ROUT LCOUT ROUT ESR
+


LCOUT ROUT ESR

+
------------------------------------------------------------------------------------------
ROUT
VOUT
IOUT
--------------
=
,
=



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