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FAN5333ASX Datasheet(PDF) 9 Page - Fairchild Semiconductor |
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FAN5333ASX Datasheet(HTML) 9 Page - Fairchild Semiconductor |
9 / 11 page 9 www.fairchildsemi.com FAN5333A/FAN5333B Rev. 1.0.1 3. Dimming Using Filtered PWM Signal This method allows the use of a greater than 1kHz PWM fre- quency signal with minimum impact on the battery ripple. The filtered PWM signal Table 8 on page 9 acts as an adjustable DC voltage as long as its frequency is significantly higher than the corner frequency of the RC low pass filter. Figure 8. Dimming Using Filtered PWM Signal Thermal Shutdown When the die temperature exceeds 150°C, a reset occurs and will remain in effect until the die cools to 130°C, at that time the circuit will be allowed to restart. PCB Layout Recommendations The inherently high peak currents and switching frequency of power supplies require careful PCB layout design. Therefore, use wide traces for high current paths and place the input capacitor, the inductor, and the output capacitor as close as possible to the integrated circuit terminals. The FB pin connec- tion should be routed away from the inductor proximity to pre- vent RF coupling. A PCB with at least one ground plane connected to pin 2 of the IC is recommended. This ground plane acts as an electromagnetic shield to reduce EMI and parasitic coupling between components. FB 20K Ω 15K Ω 5 Ω 1.6K Ω FAN5333A 0.1 µF FB 20K Ω 15K Ω 15 Ω 4.7K Ω FAN5333B 0.1 µF |
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