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TS1937 Datasheet(PDF) 6 Page - Taiwan Semiconductor Company, Ltd |
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TS1937 Datasheet(HTML) 6 Page - Taiwan Semiconductor Company, Ltd |
6 / 8 page 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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