Answer :
"Dual frequency" or low frequency switching regulators exist for several reasons, even though higher frequencies are often seen as better due to their benefits, such as smaller components and improved efficiency. Here are some key reasons:
- EMI Reduction: Lower frequency operation reduces electromagnetic interference (EMI), which can be a critical factor in sensitive electronic environments. Dual-frequency regulators can switch to a lower frequency mode when EMI needs to be minimized.
- Efficiency at Light Loads: Low frequency operation can improve efficiency at light loads. Higher frequency switching tends to increase switching losses, which can be significant when the load is small. By switching to a lower frequency, the regulator reduces these losses.
- Thermal Management: Lower frequencies can reduce heat generation, especially in applications where thermal management is challenging. This can prolong the life of components and reduce the need for extensive cooling solutions.
- Design Flexibility: Dual-frequency operation offers more flexibility in design, allowing the regulator to adapt to different operating conditions, such as varying load demands or different power states in a system.
