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For brightness dimming, the RT4501A supports 128 steps pulse dimming which determines the LED current, and RT4501 support 256 steps PWM dimming which determines the LED current
https://www.richtek.com/assets/product_file/RT4501=RT4501A/DS4501A-00.pdf
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interface to control the LED brightness dimming mode, operating frequency and LED currents
https://www.richtek.com/assets/product_file/RT8549L/DS8549L-00.pdf
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It is a multifunctional pin which can be used for enable control and PWM dimming
Design Support ▶ Design Reference ▶ EVB_RT4533AGJ6
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For brightness dimming, the RT4503A supports 32 steps pulse dimming which
https://www.richtek.com/assets/product_file/RT4503=RT4503A/DS4503A-03.pdf
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20kHz and Minimum On-Time to 400ns PWM to Analog Dimming up to 20kHz with 8-bit Resolution I
https://www.richtek.com/assets/product_file/RT8555/DS8555-01.pdf
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The input PWM dimming frequency can be operated operate from 100Hz to 20kHz without any
https://www.richtek.com/assets/product_file/RT8532A/DS8532A-01.pdf
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20kHz and Minimum On-Time to 500ns PWM to Analog Dimming up to 20kHz with 8 bit resolution
https://www.richtek.com/assets/product_file/RT8543/DS8543-05.pdf
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to 500ns PWM to Mixed Analog and PWM Dimming up to 20kHz with Maximum 9 bit
https://www.richtek.com/assets/product_file/RT8532/DS8532-05.pdf
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5 5 DCTL Digital dimming control input
https://www.richtek.com/assets/product_file/RT8463/DS8463-02.pdf
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amplifier and a 200kΩ resistor, PWM dimming signal is easily low-pass filtered to an analog dimming signal with one external capacitor for noise-free PWM dimming
https://www.richtek.com/assets/product_file/RT8560/DS8560-01.pdf
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