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L7986 Datasheet(PDF) 19 Page - STMicroelectronics

Part # L7986
Description  3 A step-down switching regulator
PDF  43 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L7986 Datasheet(HTML) 19 Page - STMicroelectronics

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DocID022450 Rev 6
19/43
L7986
Application information
43
In this way the PWM modulator gain results constant and equal to:
Equation 18
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 9 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 19
where:
Equation 20
Equation 21
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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