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TCA62723FMG Datasheet(PDF) 6 Page - Marktech Corporate |
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TCA62723FMG Datasheet(HTML) 6 Page - Marktech Corporate |
6 / 13 page TCA62723FMG 2010-06-10 6 2) Method of inputting PMW signal to terminal REXT IOUT can be set according to the next expression. Please define the cutoff frequency to the next expression. (fC ≤ fPWM) 2.7V~5.5V SHDN CTL0 CTL1 CTL2 GND VIN OUT 0 OUT 1 OUT 2 REXT TCA62723FMG VOUT VIN R1 VPWM 0V~2.6V REXT R2 C 1.17V+ (1.17V – VCONT)×REXT RCONT REXT IOUT= ×460 VCONT=D×VPWM D: PWM Duty (%) RCONT=R1+R2 Current Dimming Control (Reference data) R1=9.1kΩ, R2=8.2kΩ, REXT=8.2kΩ, C=0.22uF 0 20 40 60 80 100 120 0 1020 30 4050 60 7080 90 PW M Duty (%) fPWM=1kHz fC = 1 2 × × R × C R = R1× R2 R1 + R2 Note: These application examples are provided for reference only. Thorough evaluation and testing should be implemented when designing your application's mass production design. |
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