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TS1937CX5RF Scheda tecnica(PDF) 6 Page - Taiwan Semiconductor Company, Ltd

Il numero della parte TS1937CX5RF
Spiegazioni elettronici  Boost (Step-up) WLED Driver
Download  8 Pages
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Produttore elettronici  TSC [Taiwan Semiconductor Company, Ltd]
Homepage  http://www.taiwansemi.com
Logo TSC - Taiwan Semiconductor Company, Ltd

TS1937CX5RF Scheda tecnica(HTML) 6 Page - Taiwan Semiconductor Company, Ltd

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TS1937
Boost (Step-up) WLED Driver
6/8
Version: C07
Application Information (Continue)
2. Using a Filtered PWM Signal
The filtered PWM signal can be considered as an adjustable DC voltage. It can be used to replace the variable DC
voltage source in dimming control. The circuit is shown as follow:
Dimming Control using a Filtered PWM Signal
LED Current Control
The LED current is controlled by the feedback resistor (R1). The feedback reference is 95mV. The LED current is
95mV/R1. In order to have accurate LED current, precision resistors are preferred (1% is recommended). The formula
and table 3 for R1 selection are shown below.
R1 = 95mV/ILED
ILED (mA)
R1(Ω)
5
19.1
10
9.53
12
7.87
15
6.34
20
4.75
Duty
Iout ( mA)
0%
20
20%
17.4
30%
15
40%
12.4
50%
10
60%
8
70%
6.4
80%
4.07
100%
0
PWM : 2V ; 1KHz ; Vin=3.6V


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