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L5953 Datasheet(PDF) 28 Page - STMicroelectronics

Part # L5953
Description  Multiple switching voltage regulator
PDF  31 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

L5953 Datasheet(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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