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LED2001PUR 数据表(PDF) 20 Page - STMicroelectronics

部件名 LED2001PUR
功能描述  4 A monolithic step-down current source with synchronous rectification
PDF  42 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

LED2001PUR 数据表(HTML) 20 Page - STMicroelectronics

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Application notes
LED2001
20/42
DocID024346 Rev 1
Figure 12. LED current falling edge operation
6.6.1
Dimming frequency vs. dimming depth
As seen in Section 6.6, the LEDs current rising and falling edge time mainly depends on the
system bandwidth (TRISE) and the selected output capacitor value (TRISE and TFALL).
The dimming performance depends on the minimum current pulse shape specification of
the final application. The ideal minimum current pulse has rectangular shape, however, it
degenerates into a trapezoid or, at worst, into a triangle, depending on the ratio (TRISE +
TFALL)/ TDIM.
Equation 19
The small signal response in Figure 11 and Figure 12 is considered as an example.
Equation 20
Assuming the minimum current pulse shape specification as:
Equation 21:
it is possible to calculate the maximum dimming depth given the dimming frequency or vice
versa.
AM12903v1
rec
gle
tan
T
RISE
T
FALL
+
T
DIM
---------------------------------------------
1
«
→
trapezoid
T
RISE
T
FALL
+
T
DIM
---------------------------------------------
1
<
→
triangle
T
RISE
T
FALL
+
T
DIM
---------------------------------------------
1
=
T
RISE
20
μs
≅
T
FALL
5
μs
≅
T
RISE
T
FALL
+
0.5 T
MIN_PULSE
⋅
0.5 D
MIN
T
DIMMING
⋅⋅
==



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