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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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LP3321 датащи(PDF) 7 Page - Lowpower Semiconductor inc |
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LP3321 датащи(HTML) 7 Page - Lowpower Semiconductor inc |
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7 / 9 page  Preliminary Datasheet LP3321 LP3321 – 01 Vesion 1.1 Datasheet Feb.-2011 www.lowpowersemi.com Page 7 of 9 c. Using a Filtered PWM signal Another common application is using a filtered PWM signal as an adjustable DC voltage for LED dimming control. A filtered PWM signal acts as the DC voltage to regulate the output current. The recommended application circuit is shown in the Figure 6. In this circuit, the output ripple depends on the frequency of PWM signal. For smaller output voltage ripple (<100mV), the recommended frequency of 2.8V PWM signal should be above 2kHz. To fix the frequency of PWM signal and change the duty cycle of PWM signal can get different output current. According to the application circuit of Figure 5, output current is from 20.5mA to 5.5mA by adjusting the PWM duty cycle from 10% to 90%. Cin 10uF D1 SS14 R2 5k (0-100KHz) R1 10 PWM 10uH Vin Cout 1uF LP3321 4 3 5 EN FB Vin Cout 0.1uF R3 90k R4 100K |
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