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AIC3643 Datasheet(PDF) 9 Page - Analog Intergrations Corporation |
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AIC3643 Datasheet(HTML) 9 Page - Analog Intergrations Corporation |
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9 / 13 page  AIC3643 9 ranging from 0V to 5V, the selection of resistors in Figure 16 results in dimming control of LED current from 20mA to 0mA, respectively. 3. Using a Filtered PWM Signal 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 Figure 17. Layout Consideration In order to ensure a proper operation of AIC3643, the following points should be managed comprehensively. 1. The input capacitor and VIN should be placed as close as possible to each other to reduce the input ripple voltage. 2. The output loop, which is consisted of the inductor, the internal power switch, the Schottky diode and the output capacitor, should be kept as small as possible. 3. The routes with large current should be kept short and wide. 4. Logically the large current on the converter should flow at the same direction. 5. The FB pin should be connected to the feedback resistors directly and the route should be away from the noise sources. L 6.8 μH D1 SW VIN OVP SHDN FB GND AIC3643 VIN RFB 5 Ω C1 1 μF C2 3.3 μF PWM SS0540 Fig. 14 Dimming Control with a PWM Signal L 6.8 μ D1 SS0540 SW VIN OVP SHDN FB GND AIC3643 VIN RFB 5 Ω C1 1 μF C2 3.3 μF PWM R2 49K R1 1K Fig. 15 Dimming Control Using a PWM Signal |
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