LinkSwitch is an integrated controller device for designing low power switching power supplies, which has the characteristics of small size, light weight, wide voltage input range, low cost and high reliability.
The guide introduces the LinkSwitch family as a low‑cost, lightweight solution for AC‑DC converters that meet modern standby and no‑load power‑consumption standards. It describes the CV/CC operating principle, automatic restart behavior, and the component‑minimal topology (as few as 14 parts) that enables simple, high‑efficiency designs.
Detailed design steps cover transformer turns‑ratio calculation, primary inductance selection, feedback and clamping network sizing, component selection (diodes, capacitors, resistors), and layout considerations. Appendices provide tolerance analysis for LNK500/501 and design examples for LNK520, helping engineers iterate from a quick‑start prototype to a final product.
| Output Power | 2.75 W |
|---|---|
| Efficiency | ≥ 72 % |
| No‑Load Consumption (230 VAC) | 260 mW |
| No‑Load Consumption (115 VAC) | 200 mW |
| CV Accuracy | ± 10 % |
| CC Accuracy (LNK501) | ± 20 % |
| CC Accuracy (LNK500) | ± 25 % |
| Switching Frequency | 42 kHz |
| Minimum Component Count | 14 |
Typical efficiency is 72 % or higher.
A basic design can be built with as few as 14 components.
It reduces the average output current to about 8 % of the nominal value to protect the circuit.