The characteristics of ACDC Constant Current Chip

An AC-DC Constant Current Chip is an integrated circuit designed to provide a stable current output while converting alternating current (AC) input to direct current (DC). These are commonly used in LED drivers and low-power lighting systems. Below are the key characteristics of such chips:

Electrical Characteristics

Constant Current Output

Maintains a fixed current regardless of voltage fluctuations.

Essential for driving LEDs, which are current-sensitive.

Wide Input Voltage Range

Supports a broad range of AC voltages (e.g., 85–265V AC), allowing global operation.

High Power Factor (PF)

Power factor correction (PFC) functionality is often included to improve energy efficiency.

Low Total Harmonic Distortion (THD)

Reduces harmonic interference in the power line, ensuring better electromagnetic compatibility (EMC).

Design Features

Integrated Circuitry

Combines rectifier, filter, and control logic in one compact package.

Reduces external components and simplifies design.

No Need for Magnetic Components (in Some Designs)

Some chips (e.g., linear or capacitive types) eliminate bulky inductors/transformers, reducing size and cost.

Overvoltage and Overtemperature Protection

Built-in protection increases system reliability.

High Efficiency

Especially in switching-mode constant current chips (e.g., Buck, Boost, or Flyback types).

Typical Applications

LED bulbs and tubes

Downlights and panel lights

Street lighting

Emergency lighting

Display backlights

Example IC Families

BP2831, HLK-PM01 (for non-isolated designs)

TNY277, LNK series from Power Integrations (for isolated designs)

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