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Linear constant-current-source circuit having voltage difference compensation

A linear constant current source, voltage difference technology, applied in the direction of adjusting electrical variables, control/regulating systems, instruments, etc., can solve the problems of LED string current change, affecting the LED string voltage, affecting the minimum working voltage of the output terminal, etc., to save On-chip area, easy-to-achieve effects

Active Publication Date: 2015-05-06
SILLUMIN SEMICON CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] However, the above figure 1 and figure 2 There is another problem with the given linear current source, that is, when Iref is adjusted, V1 will have a large change, and V2 will also change accordingly, thus affecting the minimum output terminal (that is, the drain of NMOS transistor N4) to ground. Operating voltage, and further affect the voltage on the LED string, which may cause the current on the LED string to change

Method used

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  • Linear constant-current-source circuit having voltage difference compensation
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  • Linear constant-current-source circuit having voltage difference compensation

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Embodiment Construction

[0036] The linear constant current source circuit with voltage difference compensation proposed by the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become apparent from the following description and claims. It should be noted that, the accompanying drawings are all in a very simplified form and use inaccurate ratios, and are only used for the purpose of assisting in explaining the embodiments of the present invention conveniently and clearly.

[0037] see image 3 , image 3 A circuit structure diagram of a linear constant current source circuit with voltage difference compensation provided by an embodiment of the present invention, as shown in image 3 As shown, the linear constant current source circuit 300 with voltage difference compensation provided by the present invention includes: a first amplifier 1, a first NMOS transistor N...

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Abstract

The invention discloses a linear constant current source circuit with differential pressure compensation. The linear constant current source circuit with differential voltage compensation adopts an NMOS tube operating in the linear region to replace the resistor in the prior art, and simultaneously uses a and output The current-related voltage is used to control the gate of the NMOS transistor to offset the change of the drain-source voltage of the NMOS itself as the current changes. The linear constant current source circuit with pressure difference compensation provided by the invention has good characteristics and can be widely used in various occasions.

Description

technical field [0001] The invention relates to the technical field of semiconductor circuits, in particular to a linear constant current source circuit with voltage difference compensation. Background technique [0002] LED has the advantages of energy saving, environmental protection and long life, and has received more and more attention and application in various fields such as industry, commercial and household. LEDs are mainly divided into two types: voltage-driven and current-driven. With the development of technology, constant current driver has increasingly become the first choice for LED driver due to its stable current and excellent dynamic response. Among them, constant current drive can be divided into linear constant current drive and switching constant current drive. For low and medium power occasions, the linear constant current driving method is often the main driving method of LED due to its advantages of simple structure, fast response and few external d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 张子秋
Owner SILLUMIN SEMICON CO LTD