Start-up circuit, core circuit, consumable chip, consumables, start method of bandgap reference circuit and working method of core circuit

Abstract

The invention relates to the technical field of start-up technology of bandgap reference circuit, in particular to a start-up circuit, a core circuit, a consumable chip, consumables, the start methodof the bandgap reference circuit and the working method of the core circuit. When the startup circuit is powered on, the first bias input and the second bias input of the bandgap reference circuit arebiased to break the zero current state of the bandgap reference circuit. The control end of the startup circuit is connected to the output end of the bandgap reference circuit, so that the startup circuit can be turned off only when the output voltage of the bandgap reference circuit reaches the expected voltage value. When the start-up circuit is powered on, the third voltage output terminal directly provides the working current for the reference transistor, which makes the reference transistor out of the zero current state and enter the normal working state.

Description

technical field [0001] The invention relates to the technical field of starting circuits for bandgap reference circuits, and in particular to starting circuits, core circuits, consumable chips, consumables, starting methods for bandgap reference circuits, and working methods for core circuits. Background technique [0002] The bandgap reference circuit uses the negative temperature coefficient of the PN junction voltage and the positive temperature coefficient of the voltage difference between the two PN junctions under different current densities to compensate each other, so as to obtain an output voltage with low temperature drift. Theory proves that this output voltage value is approximately equal to the bandgap voltage of silicon, so this circuit is called a bandgap reference circuit. A bandgap reference circuit usually forms a power supply together with a start-up circuit to provide a stable voltage output. When the power supply is powered up, in the absence of a start...

AI Technical Summary

Problems solved by technology

[0007] (3) The input terminal of the operational amplifier OPA is at a certain potential, but it cannot make the transistor Q 0 , Q 1 conduction, so the circuit is in an unknown state

[0009] 1) Due to the resistor R 3 and R 4 the presence of MP 1 , MP 3 The drain potential is very low, not enough to turn on the transistor Q 0 , Q 1 when R 3 and R 4 Provide a current path for the circuit so that the circuit is at the third degeneracy point, causing the circuit to fail to start normally

[0010] 2) After the abnormal drop of the power supply voltage changes and returns to stability, the circuit may also be at the third degeneracy point

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