Updated
Quick answer: Choose by measured noise, power, thermal performance and transient response. A linear topology can suit sensitive low-power measurements; a switching supply can offer more power in less space. Neither topology guarantees better performance for every load.
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![\"Linear](\"https://variabledcpowersupply.com/wp-content/uploads/2024/02/Linear-VS-Switching-DC-Power-Supply.jpg\"/)
Power conversion and output control are different
A typical linear supply uses a mains transformer, rectification and filtering followed by a linear regulator. A switching supply uses switched conversion with filtering and feedback. Both can provide CV and CC regulation, and either may have analog or digital front-panel controls.
Compare performance under matching conditions
| Property | Useful comparison | What not to assume |
|---|---|---|
| Ripple/noise | Specified bandwidth, load and measurement method | Every linear model is quieter than every switching model. |
| Efficiency/heat | Efficiency and ventilation at the intended operating point | A topology label gives a universal efficiency percentage. |
| Transient recovery | Overshoot and settling for the same load change | One topology always responds faster. |
| Accuracy | Setting/readback errors at the required range | More digits imply lower error. |
Choose for the application
For a sensitive low-power measurement, noise and accuracy may outweigh size and efficiency. For a higher-power fixture, usable power, cooling and installation may become the main constraints. Define these priorities from the DUT and compare exact models instead of choosing solely from a topology label.
Acceptance measurements
- Check stable output after the specified warm-up.
- Measure noise with a suitable probe and the stated bandwidth.
- Apply a permitted load step and assess recovery against the DUT tolerance.
- Confirm current limiting and protection behaviour using the model’s prescribed procedure.
Practical checks
| Check | What to verify |
|---|---|
| Noise | Compare ripple bandwidth, load and probing conditions. |
| Power and heat | Check the operating point and ventilation rather than topology alone. |
| Load steps | Compare overshoot and recovery under the same current change. |
| Accuracy | Separate setting accuracy, readback accuracy and resolution. |