Switched Mode Power Supplies (SMPS) and Linear Power Supplies are two different types of power supply designs with distinct characteristics and advantages. Here's a comparison of the two:

**Switched Mode Power Supply (SMPS):**

1. **Efficiency:** SMPS are generally more efficient than linear power supplies. They use switching elements (like transistors) to control the power flow, resulting in reduced power loss and higher efficiency.
2. **Size and Weight:** SMPS are usually smaller and lighter compared to linear power supplies due to their high-frequency switching design.
3. **Voltage Regulation:** SMPS can provide stable output voltage over a wide range of input voltage and load conditions due to their feedback control mechanism.
4. **Heat Dissipation:** SMPS generate less heat compared to linear power supplies, as they minimize energy loss during switching.
5. **Cost:** SMPS tend to be cost-effective due to their smaller size, reduced components, and higher efficiency.
6. **Noise and Interference:** SMPS can generate more electromagnetic interference (EMI) and noise due to the high-frequency switching. Filtering components are often required to mitigate this.
7. **Complexity:** SMPS designs are more complex and require careful consideration of components, circuitry, and control mechanisms.

**Linear Power Supply:**

1. **Simplicity:** Linear power supplies are simpler in design, consisting of a transformer, rectifier, voltage regulator, and filter components.
2. **Voltage Regulation:** Linear power supplies offer good voltage regulation and low output ripple, making them suitable for sensitive electronics and applications that require stable voltage.
3. **Noise and Interference:** Linear power supplies produce less EMI and noise compared to SMPS, making them suitable for applications where electromagnetic compatibility (EMC) is important.
4. **Efficiency:** Linear power supplies are less efficient compared to SMPS, especially when the voltage difference between input and output is large.
5. **Size and Weight:** Linear power supplies are typically larger and heavier due to their design and higher power loss during regulation.
6. **Heat Dissipation:** Linear power supplies generate more heat due to the energy dissipated in the regulator's pass transistor.
7. **Cost:** Linear power supplies can be more expensive, especially for higher power applications, due to the larger components and lower efficiency.

In summary, SMPS are favored for their high efficiency, compact size, and wide input voltage range. They are commonly used in applications like computers, consumer electronics, and power adapters. On the other hand, linear power supplies are chosen for applications requiring low noise, stable voltage, and simplicity. These include sensitive audio equipment, instrumentation, and certain industrial applications. The choice between the two depends on the specific requirements of the application and the trade-offs in terms of efficiency, size, and cost.