The chip needs a stable current supply when working, if the current is unstable or exceeds the maximum current that the chip can withstand, it may cause damage to the chip. Here are the current situations that can damage the chip:
1. Overload current: When the required current of the chip exceeds its rated current, there will be overload current. The overload current will cause the chip to generate heat, and if the heat is too much, it will cause the chip to be damaged.
2. Transient current: Transient current refers to the situation in which the current changes dramatically in a short period of time, such as the transient current in the switching circuit. This current can cause electromagnetic interference, which can cause damage to the chip.
3. Reverse current: When the direction of current is opposite to the internal structure of the chip, reverse current will be generated. The reverse current can cause oxidation and corrosion of the electronics inside the chip, which can damage the chip.
4. Voltage fluctuation: Voltage fluctuation will lead to the instability of current, which will cause damage to the chip. Especially in the case of unstable DC supply voltage, the current waveform may fluctuate greatly, which will cause damage to the chip.
Therefore, in order to protect the chip from damage, it is necessary to ensure that the current of the chip is stable, and to take appropriate protective measures in the case of overcurrent, transient current, reverse current and voltage fluctuations, such as the use of regulated power supplies, fuses, overvoltage protectors, etc.
Too much or too little current can damage the chip. Too much current will cause the internal components of the chip to overload, heat accumulation, and even burn. Too small a current may cause the chip to not work properly and the signal transmission is unstable. In addition, current fluctuations, noise and interference can also cause damage to the chip.
Therefore, in order to protect the chip, it is necessary to ensure that the current runs stably within the chip specification range, and to take appropriate power filtration and protection measures.
The relationship between current size and chip damage depends on the characteristics and working conditions of the chip. Under normal circumstances, the current exceeding the maximum rated current of the chip will damage the chip. In addition, high current density, transient current, irregular current waveform, and current pulses may also cause damage to the chip.
Therefore, the power supply, current limiting circuit, filter circuit, etc. should be selected reasonably when designing the circuit, and the electrostatic discharge and transient voltage of the chip should be protected.
Overcurrent burning belongs to the joint action of current and resistance, the general burning surface is very obvious, the development time to occur is long, the area is large;
Overvoltage burnout is instantaneous breakdown in the case of overpressure, the general burn surface is small, there are discharge and traces, and the development of the occurrence time is short.