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LM3430 数据表(PDF) 4 Page - National Semiconductor (TI) |
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LM3430 数据表(HTML) 4 Page - National Semiconductor (TI) |
4 / 16 page Configuration of the Demonstration Board for Evaluation 30028904 Analog PWM Dimming Mode • Leave jumper JP3 open to enable the Analog Dimming Mode; • Short pins 1-2 of jumper JP5 to select the Analog control input; • The VR1 is used to derive the analog control voltage from LM3432's VCC output (5V nominal) and pass to LM3432's DIM input pin to control the dimming of the LED; • Adjust VR5 to change the LED brightness. The ON current of the LED is still maintained, only the duty ratio of ON time is adjusted to achieve the effect of dimming. This ensures the correct color is preserved even in dimmed output conditions. Digital PWM Dimming Mode • Short jumper JP3 to enable the Digital Dimming Mode; • Short pins 2-3 of jumper JP5 to select the Digital control input; • The external PWM dimming control signal applied to CN2 is then routed to LM3432's DIM input pin; • The control of LED current ON-OFF is passed to the externally applied PWM dimming control signal. The ON duty of the PWM control signal governs the LED brightness. www.national.com 4 |
类似零件编号 - LM3430 |
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类似说明 - LM3430 |
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