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L5953 数据表(PDF) 28 Page - STMicroelectronics

部件名 L5953
功能描述  Multiple switching voltage regulator
PDF  31 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

L5953 数据表(HTML) 28 Page - STMicroelectronics

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Application note
L5953
28/31
1. Fix the cross-over frequency fC of the overall loop gain. Usually:
where fsw,min is the minimum switching frequency
2. Calculate the high frequency error amplifier gain
3. Chose R3 and calculate
The value for R3 has not to be very high (for example 10K
Ω) so to limit the error due to an
error amplifier input offset current.
4. Calculate
5. Finally calculate
and
f
c
0.1 f
sw,min
⋅
=
G
c
0.25 f
c 2 π
L1
ESR
-------------
⋅
⋅⋅⋅
=
C8
2
L1 C7
⋅
R3
-----------------------
⋅
=
R
p
R3
2
ESR
-------------
L1
C7
--------
⋅
⎝⎠
⎛⎞
1
–
---------------------------------------------
=
R1
R
p
V
O
V
ref PWM
,
--------------------------
⋅
=
R2
R
p
1
V
ref,PWM
V
O
-------------------------
–
----------------------------------
=
R4
G
C R1
⋅
=
C9
2
L1 C7
⋅
R4
-----------------------
⋅
=



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