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LED2001 Datasheet(PDF) 18 Page - STMicroelectronics

No. de pieza LED2001
Descripción Electrónicos  4 A monolithic step-down current source with synchronous rectification
PDF  42 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

LED2001 Datasheet(HTML) 18 Page - STMicroelectronics

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Application notes
LED2001
18/42
DocID024346 Rev 1
Figure 9. Module plot
Figure 10. Phase plot
The cut-off frequency and the phase margin are:
Equation 18
6.6
Dimming operation
The dimming input disables the switching activity, masking the PWM comparator output.
The inductor current dynamic when dimming input goes high depends on the designed
system response. The best dimming performance is obtained maximizing the bandwidth
and phase margin, when it is possible.
As a general rule, the output capacitor minimization improves the dimming performance.
f
C
14 kHz
=
pm
120
°
=



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