ZSLS7025ZI1R ZMDI, ZSLS7025ZI1R Datasheet - Page 22
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ZSLS7025ZI1R
Manufacturer Part Number
ZSLS7025ZI1R
Description
LED Lighting Drivers LED Driver
Manufacturer
ZMDI
Datasheet
1.ZSLS7025ZI1R.pdf
(27 pages)
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
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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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