Discussion Overview
The discussion centers on calculating the forward current for SMD chip LEDs (specifically the 3528 model) in a 12V DC circuit configuration. Participants explore the arrangement of LEDs in series and parallel, as well as the implications for current and voltage distribution across the components.
Discussion Character
- Technical explanation
- Mathematical reasoning
- Debate/contested
Main Points Raised
- One participant states that the standard forward current for the 3528 LED is 20 mA and seeks to understand how to calculate the forward current in their specific setup of 48 LEDs.
- Another participant calculates that with 16 parallel LED strings drawing a total of 260 mA, each string would draw approximately 16.25 mA.
- There is a clarification about the configuration of the LEDs, noting that they are arranged with 16 in parallel and 3 in series, with each LED requiring between 3.5 to 4 volts.
- One participant suggests that there is likely a resistor in series with each string of 3 LEDs, estimating it to be around 100 ohms.
- Another participant discusses the design approach, proposing to allocate 25% of the voltage for a series resistor and calculating the necessary resistor value based on the voltage drop across the LEDs.
Areas of Agreement / Disagreement
Participants express various methods for calculating forward current and resistor values, but there is no consensus on a single approach or formula. The discussion remains unresolved regarding the most straightforward calculation method.
Contextual Notes
Participants mention different assumptions about voltage drops and resistor values, which may affect the calculations. The discussion does not clarify the exact specifications of the power supply or the tolerances of the components used.
Who May Find This Useful
This discussion may be useful for electronics enthusiasts, hobbyists working with LED configurations, and individuals seeking to understand current calculations in LED circuits.