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CPC9909 Datasheet(PDF) 9 Page - IXYS Corporation |
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CPC9909 Datasheet(HTML) 9 Page - IXYS Corporation |
9 / 12 page ![]() INTEGRATED CIRCUITS DIVISION CPC9909 R03 www.ixysic.com 9 2.10 Linear Dimming A linear dimming function can be implemented by applying a DC control voltage to the LD pin. By varying this voltage from 0V to VCS(high), the user can adjust the current level in the LEDs which in turn will increase or decrease the light intensity. The control voltage to the LD pin can be generated from an external voltage divider network from VDD. This function is useful if the user requires LED current of a particular level, and there is no exact RT value available. Note that applying a voltage higher than the current sense threshold voltage to the LD pin will not change the output current due to the fixed internal threshold setting. When the LD pin is not used, it should be connected to VDD. Figure 3 Typical Linear Dimming Application Circuit 2.11 PWM Dimming Pulse width modulation dimming can be implemented by driving the PWMD pin with a low frequency square wave signal in the range of a few hundred Hertz. The PWMD signal controls the LED brightness by gating the PWM gate driver output pin GATE. The signal can be generated by a microcontroller or a pulse generator with a duty cycle proportional to the amount of desired light output. Figure 4 Buck Driver for PWM Dimming Application Circuit 2.12 Combination Linear and PWM Dimming A combination of linear and PWM dimming techniques can be used to achieve a large dimming ratio. HB LEDs 350mA D1 BYV26B C1 0.1 μF 400V C1 22 μF 400V R1 402k Ω L1 4.7mH R4 0.56 Ω R2 51k Ω RA1 5.0k Ω C1 2.2 μF 16V C1 0.1 μF 25V AC AC + - BR1 Fuse F2 2A NTC1 CPC9909 V IN CS GND GATE R T LD V DD PWMD IXTA8N50P LD Monitor AC Input 90 - 265V rms HB LEDs 900mA Max ASMT-Mx00 D1 Schottky 40V 0.1 μF 50V 402k Ω 220 μH R1 0.27 Ω 10 μF 50V CPC9909 V IN CS GND GATE R T LD V DD PWMD Q1 V IN 12 - 30V DC PWM CPC1001N* *Optional Isolation |
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