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LED5000 Datasheet(PDF) 46 Page - STMicroelectronics

Part # LED5000
Description  3 A monolithic step-down current source with dimming capability
PDF  52 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED5000 Datasheet(HTML) 46 Page - STMicroelectronics

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Application notes - alternative topologies
LED5000
46/51
Doc ID 023951 Rev 1
Equation 80
where K represents the leading position of the FZ (Equation 11) in respect to the system
bandwidth. In general a decade (K=10) gives enough phase margin to the overall small loop
transfer function.
6.4.2
fp > BW
In case the pole fp is outside the system bandwidth BW, the component values composing
the compensation network can be calculated as:
Equation 81
and
Equation 82
where K represents the leading position of the FZ (Equation 11) in respect to the pole fp.
C
C
K
2
π R
⋅⋅
C
BW
⋅
---------------------------------------------
=
R
C
R
EA
A
0
----------
BW
f
p
---------
⋅
=
C
C
K
2
π R
⋅⋅
C
f
p
⋅
----------------------------------------
=



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