ZSLS7025ZI1R ZMDI, ZSLS7025ZI1R Datasheet - Page 22

• Manufacturer Part Number: ZSLS7025ZI1R
• Description: LED Lighting Drivers LED Driver
• Manufacturer: ZMDI

Specifications of ZSLS7025ZI1R

• Rohs: yes
• Input Voltage: 5 V
• Maximum Supply Current: 400 uA
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Package / Case: SOIC-8
• Minimum Operating Temperature: - 40 C

4.4.4
R
Substitute D
which can be simplified to
The low pass filter formed by R
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 f
Assume f
Choose C4 = 0.1μF, R
Choose a nominal value for R
Choose R
Substitute D
So, R
in Figure 2.1.)
3
Data Sheet
June 28, 2012
, R
ZSLS7025
Boost LED Driver
4
FB
, and R
=0.91Ω. (With the RC filter PWM dimming, R
PWM
Selecting R
I
0
R
I
OUT
15.66 x R
OUT
PWM
PWM
5

5
is 200Hz (or higher) and choose C

4
can be obtained by
0
C


3 .
=100%, V
= 10kΩ, then R
=0, V
1
V
V


FB
© 2012 Zentrum Mikroelektronik Dresden AG — Rev.1.00
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FB

 

2
3
R
PWM



3
= R
, R
3
50
f




PWM

 


R
R
= 5V and I
4
PWM

4
. 0
3
, R
5
3
5
R
+ R



86
= 400kΩ.
4
5
100


= 5V, and I
4
V
V

, and then calculate R
and C
5
3
PWM
PWM
5
R
R
R
= 26.2kΩ.
%
R
and C
R
5
FB
FB
4
4

OUT




1
0
D
D
3 .
R
R
= 350mA in the equation, and the result is
PWM
PWM
1
5
5

OUT
must have a corner frequency much lower than the PWM frequency. As

 



=0 in the equation, and the result is
V
V
FB
FB
1
PWM
= 0.1μF, and the result is R







 


.
3
.
FB
0
3 .
will be different than in the no dimming application shown




26
2 .

R
400

FB
5


0
%
10

5
0
≥400kΩ.
3 .





. 0
35
A
(17)
(18)
(19)
(20)
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