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Low Voltage Drop Linear Voltage Regulator

A linear voltage regulator and low-voltage drop technology, which is applied in the direction of instruments, electric variable adjustment, control/regulation systems, etc., can solve problems such as voltage instability, exceeding the steady-state voltage, and action errors, so as to improve the convenience of use and reduce the The effect of the chance of overshoot

Active Publication Date: 2014-10-15
HOLTEK SEMICON
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] In many circuit applications, a stable output voltage is a necessary design of the circuit, and the existing low-dropout linear regulator will produce an overshoot phenomenon during dynamic operation. The overshoot phenomenon refers to the circuit in the switching state. When the transient transient voltage cannot be stabilized in time and greatly exceeds the steady-state voltage, this overshoot phenomenon will cause voltage instability, so that the circuit or load receiving the voltage behind will cause an error or even burn out

Method used

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  • Low Voltage Drop Linear Voltage Regulator
  • Low Voltage Drop Linear Voltage Regulator
  • Low Voltage Drop Linear Voltage Regulator

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Embodiment Construction

[0052] figure 1 It is a schematic diagram of a low-dropout linear regulator according to an embodiment of the present invention. see figure 1 , a low-dropout linear regulator 1, including a switch element 10, an operational amplifier 12, an overshoot suppression circuit 14, a first resistor R1 and a second resistor R2. In practice, the overshoot suppression circuit 14 is coupled between the switch element 10 and the operational amplifier 12, and the operational amplifier 12 is coupled between the switch element 10, the overshoot suppression circuit 14 and the first and second resistors R1, R2 , whereby the low dropout linear regulator 1 of the present invention uses the overshoot suppression circuit 14 to suppress the overshoot phenomenon when the power supply starts.

[0053] Generally speaking, during the transient period when the input power is activated, assuming that the gate voltage of the switching element 10 is slightly lower than the input voltage Vin, the switching...

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Abstract

The present invention discloses a low voltage drop linear voltage regulator comprising a switch element, an operational amplifier and an overshoot suppression circuit. The switch element possesses a source, a drain and a grid, the source is coupled with an input voltage, and the drain is used to output an output voltage. The operational amplifier possesses a first input end, a second input end and an output end, the output end is coupled with the grid of the switch element, and the first and second input ends are coupled with a reference voltage and a feedback voltage respectively. The overshoot suppression circuit is coupled among the input voltage, the switch element and the operational amplifier. At the transient state period of starting the input voltage, the overshoot suppression circuit outputs a suppression voltage to the switch element, so that the switch element is cut off. When the input voltage reaches an operation steady state period, the overshoot suppression circuit cuts off, and the operational amplifier control the conduction or cut-off of the switch element.

Description

technical field [0001] The invention relates to a low-drop linear voltage regulator, in particular to a low-drop linear voltage regulator with an overshoot suppression circuit. Background technique [0002] In many circuit applications, a stable output voltage is a necessary design of the circuit, and the existing low-dropout linear regulator will produce an overshoot phenomenon during dynamic operation. The overshoot phenomenon refers to the circuit in the switching state. At this time, the transient transient voltage cannot be stabilized in time and greatly exceeds the steady-state voltage. This overshoot phenomenon will cause voltage instability, so that the circuit or load receiving the voltage behind will cause an operation error or even burn out. [0003] The overshoot phenomenon of the instantaneous rise of the input power supply should be suppressed within the allowable range, and the low-dropout linear regulator will not consume additional quiescent current during d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
Inventor 林冠佑李俊欣李铭富任永星
Owner HOLTEK SEMICON
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