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L5953 Arkusz danych(PDF) 28 Page - STMicroelectronics

Numer części L5953
Szczegółowy opis  Multiple switching voltage regulator
PDF  31 Pages
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Producent  STMICROELECTRONICS [STMicroelectronics]
Strona internetowa  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5953 Arkusz danych(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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