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Constant temperature loop circuit for switch type current source chip

A current source and switch-type technology, which is applied in the field of constant temperature of power supply chips, can solve the problem of repeated shutdown and restart of the chip, and achieve the effect of avoiding repeated startup and shutdown of the chip

Active Publication Date: 2020-06-30
SHENZHEN LOWPOWER SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a constant temperature ring circuit for a switch-type current source chip, which solves the problem that the over-temperature protection circuit in the switch-type current source easily leads to repeated shutdown and restart of the chip

Method used

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  • Constant temperature loop circuit for switch type current source chip

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Embodiment Construction

[0018] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0019] refer to figure 1 As shown, the present invention provides a constant temperature ring circuit for a switch-type current source chip, including an over-temperature protection circuit 500, and a drive logic circuit 600 coupled to the output of the over-temperature protection circuit 500; the over-temperature protection circuit 500 The first input terminal 100 and the second input terminal 200 are connected; wherein, the first input terminal 100 is used to access a voltage signal that changes with the chip temperature in a certain pattern, and generates an over-temperature protection signal through the temperature protection circuit 500; The second input terminal 200 is used to access the sampling current signal of the chip output current. The sampling current signal and the over-temperature protection signal make the over-temperature pr...

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Abstract

The invention discloses a constant temperature loop circuit for a switch type current source chip. The constant temperature loop circuit comprises an over-temperature protection circuit and a drivinglogic circuit coupled to the output end of the over-temperature protection circuit, and when the temperature of the chip begins to rise due to the on-load working, the over-temperature protection circuit detects an over-temperature protection signal to reduce the current value of the sampling current, so that the driving logic circuit controls the output current of the chip to be reduced, and thetemperature of the chip does not continue to rise any more. According to the invention, the problem of repeated turn-off and restart of the chip easily caused by an over-temperature protection circuitin the switch type current source is solved.

Description

technical field [0001] The invention relates to the technical field of power supply chip constant temperature, in particular to a constant temperature ring circuit for a switch-type current source chip. Background technique [0002] Switching current source chips are widely used in various scenarios, such as driving LED lights. A current development trend of switch-type current sources is that the load carried is getting larger and larger, but the packaging volume has not increased in a corresponding proportion due to cost and portability considerations. In this way, the over-temperature problem when the current source chip is working becomes more and more important, and some over-temperature protection circuits must be designed inside the chip to protect the chip from being burned or invalidated due to excessive temperature. At present, the over-temperature protection scheme adopted by most switching current sources is that when the temperature rises to a certain temperatu...

Claims

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Application Information

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IPC IPC(8): G05D23/20
CPCG05D23/20
Inventor 陈超
Owner SHENZHEN LOWPOWER SEMICON CO LTD