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Lighting Systems

Lighting Systems

Copy of Automotive Electrical Power Distribution System - on Sun, 05/24/2020 - 20:59

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Copy of Automotive Electrical Power Distribution System - on Sun, 05/17/2020 - 23:14

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Automotive Electrical Power Distribution System - on Thu, 04/23/2020 - 21:27

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Copy of Automotive Electrical Power Distribution System - on Mon, 04/06/2020 - 15:16

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Copy of Automotive Electrical Power Distribution System - on Thu, 03/26/2020 - 08:56

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Copy of Automotive Electrical Power Distribution System - on Tue, 02/11/2020 - 18:51

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Copy of Single-string Test - ACME AS123 LED Driver with Dimmer Control - on Sat, 02/08/2020 - 22:12

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ACME AS123 LED Driver with Dimmer Control - on Sun, 01/26/2020 - 15:13

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ACME AS123 LED Driver with Dimmer Control - Application Note

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<p>The AS123 LED Driver from ACME Semiconductor (fictional) provides fully integrated PWM dimming and a programmable current set-point. This IC is specifically for automotive rear combination (tail/stop) lighting applications. It tightly regulates the desired string current under conditions of widely varying applied DC voltage.</p><p>The PWM dimming function, which switches the LED on and off at just over 300 Hz, is active when the line input pin is high and the "PWM_disable" pin is low (</p><p>The AS123 supports current programming using a single external resistor (see r_iset in the schematic). The resistor value can be selected to give the desired LED string current, using the following formula:</p><p>r_iset = 1.85/i_desired </p><p>The AS123 is capable of regulating up to 100mA per string continuously. Therefore the value of r_iset should be no less than 18.5 Ohms. The user can change this resistor value and run a new simulation, to see the effect of this change on the LED string current. </p><p>See a "functional block diagram" schematic model of the ACME AS123 here: https://www.systemvision.com/design/acme-as123-led-driver-schematic-model</p><p>--------------  End of Example Application Note ------------------</p><p>If you are a component supplier, this type of "Live Application Note" can help your potential customers better understand the features and benefits of your components.</p>

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