Application of alloy resistors in lighting

author: Milliohm Electronics

2026-01-31

I. Core Functions and Principles

① Current Limiting Protection: Based on Ohm's Law, limits current to prevent LEDs and other components from burning out due to overcurrent (e.g., LED rated current is typically <20mA).
② Voltage Stabilization and Dividing: Balances circuit voltage to ensure uniform brightness of the lamp (adapts to different power supply voltages).
③ Dimming Control: Adjusts current through variable resistors to achieve stepless brightness adjustment (supports PWM dimming technology).
④ Fault Protection: Suppresses surge current, buffers circuit abrupt changes, and extends lamp life.

Stable LED Power Supply + Interference Suppression

II. Typical Application Scenarios

① General LED Lighting: Bulbs, tubes, panel lights
② Intelligent Lighting Systems: Dimmable table lamps, intelligent taillights
③ Special Lighting: LED displays, traffic lights (relying on balancing resistors to ensure consistent brightness)
④ Protection Circuit: Series LED fault protection (current-limiting resistors suppress current abrupt changes).

Typical Applications of Surface Mount Resistors in LEDs

III. Typical Requirements and Selection (Core Selection Points):

① ① Power Selection: Calculate the required resistor power based on the power consumption of the lighting equipment, reserving a 30%~50% power margin (e.g., for equipment power consumption of 1W, select a 1.5W~2W resistor).
② Temperature Selection: For high-temperature scenarios (such as inside luminaires), alloy resistors with a temperature coefficient ≤±50ppm/℃ are preferred.
③ Accuracy Selection: Use high-precision resistors (±1% and below) for drive circuits and intelligent control modules; ±5% accuracy resistors can be used for ordinary lighting circuits.
④ Installation Method Selection: Use surface-mount resistors (0805, 1206 packages) for compact luminaires; use through-hole power resistors for high-power scenarios.

Note: This document is subject to change without notice. For further information on products or solutions, or applications in specific scenarios, please contact technical support.

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