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AN2823 Datasheet(PDF) 25 Page - STMicroelectronics

Part # AN2823
Description  Current source for LED driving based on the L5973AD
PDF  33 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN2823 Datasheet(HTML) 25 Page - STMicroelectronics

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AN2823
The L5973AD in LED driving applications
Doc ID 15015 Rev 1
25/33
where:
Equation 35
Considering L=100 µH and COUT=100 nF (see Figure 19), the frequency of the double pole
can be approximated to 50 kHz.
Figure 25.
Module plot
The cutoff frequency and the phase margin are:
Equation 36
Figure 26.
Phase plot
Z
1 s
()
1
sC
6
⋅
1
R
14
---------
+
-------------------------------
=
Z
2 s
()
1
sC
7
⋅
1
R
16
---------
+
-------------------------------
=
AM01375v1
F
C
73kHz
=
ζ
M
35o
=
AM01376v1



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