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ST1S32 bảng dữ liệu(PDF) 10 Page - STMicroelectronics

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Giải thích chi tiết về linh kiện  4 A DC step-down switching regulator
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Functional description
ST1S32
10/29
Doc ID 023246 Rev 1
Equation 3
where:
Equation 4
Sn represents the ON-time slope of the sensed inductor current, Se the slope of the external
ramp (VPP peak-to-peak amplitude - 0.535 V) that implements the slope compensation to
avoid sub-harmonic oscillations at duty cycle over 50%.
The sampling effect contribution FH(s) is:
Equation 5
where:
Equation 6
and
Equation 7
The transfer function GDIV(s) from VOUT to FB results:
The transfer function from FB to Vc (output of E/A) introduces the singularities (poles and
zeroes) to stabilize the loop. In Figure 5, the small signal model of the error amplifier with the
internal compensation network is shown.
ω
p
1
R
LOAD
C
OUT
----------------------------------------
m
C
1D
() 0.5
LC
OUT
f
SW
⋅⋅
------------------------------------------------
+
=
m
C
1
S
e
S
n
------
+
=
S
e
V
pp
f
SW
=
S
n
V
IN
V
OUT
L
------------------------------
R
i
=
F
H s
()
1
1
s
ω
n
Q
P
---------------------
s
2
ω
n
2
-----
++
-------------------------------------------
=
Q
P
1
π
m
C
1D
() 0.5
[]
----------------------------------------------------------------
=
ω
n
π f
SW
=
G
DIV s
()
R
2
R
1
R
2
+
--------------------
=


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