Open-drain output type current-limiting protection circuit
A current-limiting protection and circuit technology, which is applied in the field of current-limiting protection circuits, can solve problems such as chip reliability decline, safety hazards, short circuits, etc., and achieve the effect of preventing chip reliability decline and eliminating safety hazards
Active Publication Date: 2015-02-18
PUYA SEMICON SHANGHAI CO LTD
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Problems solved by technology
[0002] Common open-drain output circuits such as figure 1 As shown, the drive tube N1 works in the linear region, and the current increases linearly with the output terminal OUT. The open-drain output needs to be connected to a pull-up circuit. In order to adapt to various loads, a large drive capacity is required, but there are problems in output protection. , the output terminal OUT of the open-drain output circuit may be short-circuited with the VDD of the power supply, resulting in a decrease in chip reliability and certain safety hazards during use
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[0011] See figure 2 As shown, an open-drain output current limiting protection circuit includes an inverter I1 and a first NMOS transistor N1, the input terminal of the inverter I1 is the driving input terminal IN, and the output terminal of the inverter I1 is connected to the first The gate end of the NMOS transistor N1, the source end of the first NMOS transistor N1 is grounded, and it is characterized in that it also includes a second NMOS transistor N2, a third NMOS transistor N3, a fourth NMOS transistor N4, a bias current Ibiasp, the first NMOS transistor N1 The drain terminal of the transistor N1 is connected to the source terminal of the second NMOS transistor N2 and the gate terminal of the third NMOS transistor N3, the drain terminal of the second NMOS transistor N2 is the driving output terminal OUT, and the gate terminal of the second NMOS transistor N2 is connected to the fourth The gate end and the drain end of the NMOS transistor N4, one end of the bias current...
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The invention relates to the technical field of simulation power supply, particularly to an open-drain output type current-limiting protection circuit. The open-drain output type current-limiting protection circuit has the advantages that the risk that short circuit occurs to an output end and a power supply so as to cause reliability of a chip to decrease is prevented, and potential safety hazard during utilization is eliminated. The open-drain output type current-limiting protection circuit comprises an inverter I1 and a first NMOS (n-channel metal oxide semiconductor) pipe N1. An input end of the inverter I1 is an input end IN. An output end of the inverter I1 is connected with a gate end of the first NMOS pipe N1. A source end of the first NMSO pipe N1 is grounded. The open-drain output type current-limiting protection circuit is characterized by further comprising a second NMOS pipe N2, a third NMOS pipe N3, a fourth NMOS pipe N4 and a bias current Ibiasp; a drain end of the first NMOS pipe N1 is connected with a source end of the second NMOS pipe N2 and a gate end of a third NMOS pipe N3; a drain end of the second NMOS pipe N2 is a drive output end OUT; a gate end of the second NMOS pipe N2 is connected with a gate end and a drain end of the fourth NMOS pipe N4 and one end of the bias current Ibiasp, and the other end of the bias current Ibiasp is connected with a power supply VDD; a source end of the fourth NMOS pipe N4 is connected with a drain end of the third NMOS pipe N3, and a source end of the third NMOS pipe N3 is grounded.
Description
technical field [0001] The invention relates to the technical field of analog power supplies, in particular to an open-drain output current limiting protection circuit. Background technique [0002] Common open-drain output circuits such as figure 1 As shown, the drive tube N1 works in the linear region, and the current increases linearly with the output terminal OUT. The open-drain output needs to be connected to a pull-up circuit. In order to adapt to various loads, a large drive capacity is required, but there are problems in output protection. , the output terminal OUT of the open-drain output circuit may be short-circuited with the VDD of the power supply, resulting in a decrease in chip reliability and certain safety hazards during use. Contents of the invention [0003] In order to solve the above problems, the present invention provides an open-drain output current-limiting protection circuit, which can prevent the short circuit between the output terminal and the...
Claims
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Inventor 李兆桂
Owner PUYA SEMICON SHANGHAI CO LTD