One of the causes of electronic system failure is input fuse.
Self-healing properties automatically recover when 'broken'

When buying a TV, the brand is one of the important choices. The brand affects the reliability of the product. Since different manufacturers have different quality standards, there are bound to be brands that break down more frequently.

When a product breaks down, the manufacturer must spend time and money to repair it. Finding and replacing the defective part in the TV and recording the root cause of the failure takes a considerable amount of time, and it costs replacement costs and labor costs to restore it to its original state.

One of the most common components to fail in an electronic system is the input fuse. TVs often use mechanical fuses (or “melting fuses”). Manufacturers often rely on mechanical fuses to protect their systems instead of more expensive options because of their low cost. Unfortunately, mechanical fuses must be physically replaced every time they fail because they melt and become damaged and inoperable. Additionally, each fuse has a current rating and trip point, so they should be stored and managed carefully.


The operating characteristics of mechanical fuses contrast sharply with electronic fuses, also known as eFuses. Semiconductor devices such as the TI TPS25921A in Figure 2 have “self-healing” characteristics, meaning that when a fuse “blows,” it can automatically recover and reconfigure the circuit.

eFuses detect overload events and protect downstream circuits by limiting current, clamping output voltage, and, if necessary, shutting off power to the eFuse output. Each eFuse offers a variable current limit setting with an external resistor, simplifying inventory management by reducing the number of unique parts that manufacturers need to stock compared to mechanical fuses.

Some eFuses can also protect against reverse current by adding an external blocking FET (TPS25924) or integrating back-to-back FETs (TPS25940). In simple terms, the role of the eFuse is to ensure that the downstream circuitry is fully protected against any overcurrent or overvoltage transient conditions.

Compared to mechanical fuses, eFuses are more effective at preventing damage to downstream components. In the time it takes for a mechanical fuse to heat up and “melt,” an eFuse already protects the circuit. This time difference means that a system designed with an eFuse will not be damaged by temporary overcurrent or overvoltage events and will return to normal operation once the problem is resolved. In contrast, the same system designed with a mechanical fuse will have to be returned to the manufacturer for replacement if the fuse blows.

Using eFuses instead of mechanical fuses in your TV can reduce the risk of product failure.