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LED6000 датащи(PDF) 29 Page - STMicroelectronics

номер детали LED6000
подробное описание детали  3 A, 61 V monolithic current source with dimming capability
PDF  49 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED6000 датащи(HTML) 29 Page - STMicroelectronics

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LED6000
Application notes - step-down conversion
49
As shown in Equation 16, fz depends on the output capacitor parasitic resistance and on the
LEDs dynamic resistance. Following the considerations summarized in Section 5.2 on
page 25, in the typical application the programmed control loop bandwidth (BW) might be
higher than fz, so this zero helps stabilize the loop. If this assumption is verified, a type II
compensation network is required for loop stabilization.
In Figure 17 the type II compensation network is shown.
Figure 17. Type II compensation network
The type II compensation network transfer function, from VSNS to COMP, is computed in
Equation 19.
Equation 19
Equation 20
The following suggestions can be followed for a quite common compensation strategy,
assuming that CP << CF.
Starting from Equation 18, the control loop gain module at s = 2
* FBW allows to fix the
RF/RU ratio:
Equation 21
After choosing the regulator bandwidth (typically FBW < 0.2 * FSW) and a value for RU,
usually between 1 k
 and 50 k, in order to achieve CF and CP not comparable with

F
P
F
P
U
P
F
P
F
F
Z
R
C
C
f
R
C
C
f
R
C
f
//
2
1
;
2
1
;
2
1
1
0
1



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