Circuit for speeding up stabilizing low voltage difference linear stabilizer output voltage

A technology of low dropout linearity and output voltage, which is applied in the direction of instruments, adjusting electrical variables, and conversion equipment without intermediate conversion to AC. It can solve problems such as lack of LDO and poor response characteristics of LDO, and achieve the effect of improving transient response.

Inactive Publication Date: 2006-08-23
CHIPHOMER TECH SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In some designs, due to the constraints of some parameters such as stability and quiescent current, the LDO system does not have a large

Method used

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  • Circuit for speeding up stabilizing low voltage difference linear stabilizer output voltage
  • Circuit for speeding up stabilizing low voltage difference linear stabilizer output voltage
  • Circuit for speeding up stabilizing low voltage difference linear stabilizer output voltage

Examples

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Embodiment Construction

[0021] Such as image 3 As shown, the circuit of the LDO output voltage of the present invention is based on the existing circuit composed of the output tube 103, the error amplifier 102, the reference voltage source 101, the resistor divider network and the load 105. The difference is: the resistor divider network 204 Three feedback voltages are provided, namely Vfb, a voltage Vfb+ΔV slightly higher than Vfb, and a voltage Vfb-ΔV slightly lower than Vfb.

[0022] The first charge discharge control circuit 206 is for quickly discharging the gate capacitance of the output transistor 203, and is composed of a first comparator comp1, a first MOS switch MN1 and a current source. The input terminals of the first comparator comp1 are respectively connected to the reference voltage Vref generated by the reference and a voltage Vfb+ΔV slightly higher than the feedback voltage.

[0023] The second charge discharge control circuit 207 is for quickly discharging the load 205 capacitance...

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Abstract

This invention relates to a circuit for speeding up the stabilized low voltage difference linear regulator output voltage based on a circuit composed of an output tube, an error amplifier, a primary standard voltage source, a resistor bleeder network and a load including reference voltage output by said primary voltage source and a feed back voltage output by the network characterizing that said resistor bleeder network is composed of four serial bleeder resistors used in providing three feed back voltages, namely, a first feed back voltage, a second voltage and a third feed back voltage, which utilizes the instant controlled current to speed up the discharge to the grating capacitance of the MPX and the discharge of the output capacitor so as to improve the instant response of LDO greatly.

Description

technical field [0001] The invention relates to an analog integrated circuit technology, in particular to a circuit for accelerating and stabilizing the output voltage of a low-dropout linear regulator. Background technique [0002] LDO (Low Dropout Regulator, low dropout linear regulator) is an important branch of power IC (Integrated circuit, integrated circuit), and based on PWM (Pulse Width Modulation, pulse width modulation), PFM (Pulse Frequency Modulation, pulse frequency modulation Principle) compared with the DC-DC (direct-direct current) converter, it has the advantages of low cost, low noise and small quiescent current. At the same time, because it does not need an inductor, it will not cause EMI problems. In portable product applications, LDO is often used as the power supply of the system. [0003] Such as figure 1 As shown, a basic LDO is composed of an output transistor 103 , a resistor divider network 104 , an error amplifier 102 and a reference voltage sou...

Claims

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Application Information

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IPC IPC(8): G05F1/56H02M3/07
Inventor 吴珂孙洪军史亚军
Owner CHIPHOMER TECH SHANGHAI
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