The Probelm :

Switch Mode Power Supplies (SMPS) power many devices, but they often waste energy when running in low-power or standby mode. This happens because the control circuit keeps switching even when the load is minimal, leading to unnecessary power loss.

The Solution :

To fix this, you can optimize the SMPS for low-power mode by:

• Using an efficient feedback controller like the TL431 to regulate voltage and reduce switching frequency.

• Integrating a MOSFET with low gate capacitance to minimize losses in standby mode.

Practical Example :

Consider a Wi-Fi-enabled IoT device that stays in standby mode most of the time, drawing minimal current. If the SMPS supplying power to this device isn’t optimized, it may consume unnecessary power. By replacing the feedback control with a TL431 voltage reference and using a low-loss MOSFET, you can reduce the standby power consumption significantly.

Sample Calculation :

For a device drawing 12mA at 5V in standby mode:

• Power loss = 5V × 0.012A = 0.06W
  By using a more efficient feedback control and reducing the switching frequency, standby power can be cut by 40%, reducing the loss to 0.036W. This optimization extends battery life and improves system efficiency.

Product Suggestions :

• TL431 Voltage Reference: Ensures better voltage regulation and minimizes switching losses. Get it from SmartXProKits.in.

• MOSFET for Switching: Ideal for low-power mode optimization. Explore MOSFETs at SmartXProKits.in.

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