Low dropout regulator (LDO) transient response enhancing circuit based on voltage induction

A transient response, voltage sensing technology, applied in the direction of regulating electrical variables, control/regulating systems, instruments, etc., to achieve the effect of enhancing transient response capabilities

Inactive Publication Date: 2013-09-25
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of the traditional LDO circuit structure, in order to enhance the transient response capability of the LDO without weakening other performances, adjusting the LDO parameters alone cannot achieve substantial results, so the circuit structure must be improved

Method used

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  • Low dropout regulator (LDO) transient response enhancing circuit based on voltage induction
  • Low dropout regulator (LDO) transient response enhancing circuit based on voltage induction
  • Low dropout regulator (LDO) transient response enhancing circuit based on voltage induction

Examples

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Embodiment 1

[0019] like figure 2 As shown, an LDO transient response enhancement circuit based on voltage induction includes a capacitor Co, an adjustment tube Mp, an error amplifier EA, resistors R1-R6, and a slew rate enhancement circuit; the output terminal of the slew rate enhancement circuit is connected to the adjustment tube The gate of Mp, the input terminals of the slew rate enhancement circuit are VHD, GND, Vref, Vf1 and Vf2, the gate of the adjustment tube Mp is connected to the output terminal of the error amplifier EA,

[0020] The drain of the adjusting tube Mp is grounded through the output capacitor Co; the drain of the adjusting tube Mp is grounded through the resistors R2 and R1 connected in series; the drain of the adjusting tube Mp is grounded through the resistors R4 and R3 connected in series; the drain of the adjusting tube Mp The resistors R6 and R5 connected in series are grounded; the lead-out terminal Vf between the resistors R1 and R2 is connected to the posit...

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Abstract

The invention discloses a low dropout regulator (LDO) transient response enhancing circuit based on voltage induction. The LDO transient response enhancing circuit can obtain LDO transient state responding condition by detecting voltage on the output end of a load. When load current changes suddenly from low to high or from high to low, output voltage can drop or rise, when variation amplitude of the output voltage is larger than certain degree, a slew rate intensifier circuit is started, a grid of a compensating pipe can be charged or discharged fast to change the conduction degree of the compensating pipe, conduction current can be controlled to meet load requirements, and the effect of reducing output voltage overshoot can be achieved. According to simulation results, the LDO transient response enhancing circuit can remarkably improve load transient responding capability of an LDO.

Description

technical field [0001] The invention relates to the field of low-dropout line voltage regulator LDO, and more particularly relates to an LDO transient response enhancement circuit based on voltage induction. Background technique [0002] Low dropout line regulator LDO has been more and more widely used in portable electronic products due to its advantages of low output noise, small voltage drop, and low cost. In the high-speed digital circuit regulated by LDO, the main frequency is getting higher and higher, even reaching several GHz. The instantaneous jump of the level in the digital circuit will cause the instantaneous jump of the current. The digital circuit is regarded as the load of the LDO, and the instantaneous jump of the load current will affect the output voltage of the LDO. [0003] The transient response of LDO includes linear transient response and load transient response. The linear transient response refers to the response of the LDO output voltage when the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/569
Inventor 谭洪舟曾衍瀚张俊曾淼旺许远坤
Owner SUN YAT SEN UNIV
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