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ZLED7025 데이터시트(PDF) 21 Page - Integrated Device Technology

부품명 ZLED7025
상세설명  Boost LED Driver
PDF  26 Pages
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제조업체  IDT [Integrated Device Technology]
홈페이지  http://www.idt.com
Logo IDT - Integrated Device Technology

ZLED7025 데이터시트(HTML) 21 Page - Integrated Device Technology

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ZSLS7025 Datasheet
© 2016 Integrated Device Technology, Inc.
21
April 20, 2016
(
)
FB
5
4
FB
PWM
PWM
3
FB
OUT
R
R
R
V
D
V
R
V
I


+
−
×
×
−
=
(
)
86
.
0
R
R
3
.
0
%
100
5
R
3
.
0
0
5
4
3


+
−
×
×
−
=
PWM
1
5
f
2
50
C
R
π
≥
×
(
)
(
)
A
35
.
0
R
10
400
3
.
0
%
0
5
2
.
26
3
.
0
R
R
R
V
D
V
R
V
I
FB
FB
5
4
FB
PWM
PWM
3
FB
OUT
=
+
−
×
×
−
=


+
−
×
×
−
=
4.4.4
Selecting R3, R4, R5 and C1
R3, R4, and R5 can be obtained by
(17)
Substitute DPWM=100%, VPWM = 5V, and IOUT =0 in the equation, and the result is
(18)
which can be simplified to
15.66 x R3 = R4 + R5
The low pass filter formed by R5 and C1 must have a corner frequency much lower than the PWM frequency. As the
corner frequency of the filter decreases, the response time of the LED current to changes in PWM increases. Choose
a corner frequency 50 times lower than fPWM.
(19)
Assume fPWM is 200Hz (or higher) and choose C1
= 0.1μF, and the result is R
5
≥400kΩ.
 Choose
C4 = 0.1μF, R
5
= 400kΩ.
Choose a nominal value for R4, and then calculate R3.
 Choose R
4
= 10kΩ, then R
3
= 26.2kΩ.
Substitute DPWM=0, VPWM = 5V and IOUT = 350mA in the equation, and the result is
(20)
So, RFB
=0.91Ω. (With the RC filter PWM dimming, RFB will be different than in the no dimming application shown in
Figure 2.1.)



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