LED | PartQuest™ Explore

ohms law

belaid.b
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ACME AS123 LED Driver with Dimmer Control - Application Note

MurshidulHakimee
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Description

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.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 (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:r_iset = 1.85/i_desired 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. See a "functional block diagram" schematic model of the ACME AS123 here: https://www.systemvision.com/design/acme-as123-led-driver-schematic-model-------------- End of Example Application Note ------------------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.

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LED fading

MahfuzRaihan
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MahfuzRaihan

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IR LED -Simulation

flavius.stoita
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Demonstration circuit

rpoulin
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Circuito

MarcosTulioJunior
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Daytime running lights and sequential amber on Ford Focus ST

chrisallen236
Designer201072

chrisallen236

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Astable multivibrator

Marttin
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Slayer circuit Tesla coil

JTApczynski
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ACME LED Driver - full flat schematic

Mike Donnelly
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Mike Donnelly

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Member of the PartQuest Explore Development Team. Focused on modeling and simulation of analog, mixed-signal and multi-discipline systems covering a broad range of applications, including power electronics, controls and mechatronic systems.

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belaid.b
Designer206504

MurshidulHakimee
Designer203528

MahfuzRaihan
Designer202826

flavius.stoita
Designer202711

rpoulin
Designer201579

MarcosTulioJunior
Designer201227

chrisallen236
Designer201072

Marttin
Designer200903

JTApczynski
Designer200606

Mike Donnelly
Designer19