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SS6896CGBG データシート(PDF) 10 Page - Silicon Standard Corp. |
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SS6896CGBG データシート(HTML) 10 Page - Silicon Standard Corp. |
10 / 12 page www.SiliconStandard.com 10 of 12 Rev.2.01 6/06/2003 SS6896 DC voltage is shown in Fig. 22. As the DC voltage increases, the voltage drop on R2 increases and the voltage drop on R1 decreases. Thus, the LED current decreases. The selection of R2 and R3 should make the current from the variable DC source much smaller than the LED current and much larger than the FB pin bias current. For VDC range from 0V to 5V, the selection of resistors in Fig. 22 gives dimming control of LED current from 20mA to 0mA. 3. 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 in Fig. 23. ZD1 19.6V~20.4V BZV55-B20 R2 1K£[ LX FB GND SS SHDN IN L1 10µH C2 0.033µF C1 4.7µF ON OFF 3V to 4.2V VIN D1 CH521S-30 R1 62£[ C3 1µF IOUT=ILED=20mA 6 4 1 3 5 2 Fig. 20 White LED driver with open-circuit protection LX FB GND SS SHDN IN SS6896 C2 0.033 µF R1 62£[ R2 1K£[ PWM ZD1 LX FB GND SS SHDN IN SS6896 C2 0.033 µF R1 82 Ω R2 1K Ω PWM ZD1 R3 3.3K Ω ON OFF (a) (b) Fig. 21 Dimming-control using a PWM signal SS6896 |
同様の部品番号 - SS6896CGBG |
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同様の説明 - SS6896CGBG |
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