What is a linear integrated power supply

A linear integrated power supply is a power supply that converts AC to a stable DC voltage using linear regulation, often integrated on the same PCB as the load for compact and low-noise operation.OverviewA linear integrated power supply combines the principles of a linear power supply with integration into the device it powers. It converts an AC input voltage into a stable DC output using a transformer, rectifier, filter, and linear regulator . Unlike switching power supplies, it does not use high-frequency switching, which results in very low electrical noise and ripple, making it ideal for sensitive electronics .Key ComponentsTransformer: Steps the AC voltage up or down to the desired level.Rectifier: Converts AC to DC, typically using diodes.Filter: Smooths the rectified DC to reduce voltage fluctuations.Linear Regulator: Maintains a constant output voltage by operating a transistor in its linear region, adjusting the voltage drop to compensate for input or load variations .Integrated DesignIn an integrated power supply, the PSU circuitry is often built on the same printed circuit board (PCB) as the load it powers . This integration reduces space, simplifies wiring, and can improve performance by minimizing voltage drops and interference between the supply and the load.AdvantagesLow noise and ripple, suitable for audio, instrumentation, and precision analog circuits .High reliability due to fewer components and simpler design.Ease of repair and maintenance.Can provide multiple output voltages or dual tracking outputs for op-amp circuits .LimitationsLower efficiency compared to switching power supplies, as excess energy is dissipated as heat.Larger size and weight due to the transformer and heat sinks.Requires adequate heat dissipation for high-current applications .ApplicationsLinear integrated power supplies are commonly used in:Laboratory bench power suppliesAudio equipmentSensitive analog circuitsIndustrial instrumentation where clean, stable DC voltage is critical . In summary, a linear integrated power supply provides a stable, low-noise DC voltage by using linear regulation and is often integrated with the load for compactness and improved performance, though it is less efficient and bulkier than switching alternatives.