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Low-dropout linear regulated power supply

A low-dropout linear, regulated power supply technology, applied in the direction of regulating electrical variables, control/regulation systems, instruments, etc., can solve the problem of inability to configure low-dropout linear regulated power supplies

Pending Publication Date: 2020-08-25
NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In some applications, the system needs to configure the power-on sequence, current limiting protection point and output voltage of the low-dropout linear regulated power supply. At present, the existing technology cannot conveniently configure the above-mentioned functions and adjustments for the low-dropout linear regulated power supply. The size of the specific value of the above functions

Method used

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  • Low-dropout linear regulated power supply
  • Low-dropout linear regulated power supply

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Example 1, see figure 1 , low dropout linear regulated power supply includes low dropout linear regulator U1, the model of low voltage linear regulator U1 can be HL7H1101, soft start capacitor C1, loop compensation capacitor C3, output filter capacitor C4, soft start capacitor C1 and low voltage Pin 1 (SS, soft-start terminal) of the differential linear regulator U1 is connected to the ground terminal, and pin 3 (Vin, input voltage terminal) of the low-dropout linear regulator U1 is an input pin, and the input pin is connected to the input voltage Vin, and connect the input filter capacitor C2 to the ground.

[0017] One end of the loop compensation capacitor C3 is connected to pin 7 (COMP, the output terminal of the error amplifier) ​​of the low dropout linear regulator U1, and the other end is connected to the output pin of the low dropout linear regulator U1, that is, pin 6 (Vo, the output voltage terminal), 6-pin output voltage Vo.

[0018] Both ends of the output...

Embodiment 2

[0023] Embodiment 2, the low-dropout linear regulated power supply is designed as follows:

[0024] The input voltage Vin enters the low dropout linear regulator U1 after passing through the input filter capacitor C2. The capacitance of the input filter capacitor C2 is determined according to the ripple condition of the input voltage Vin. Specifically, the input voltage Vin is provided by a programmable power supply, and the ripple is relatively small. The input filter capacitor C2 is set to 10uF to filter out the influence of the ripple of the input voltage Vin on the low dropout linear regulator U1.

[0025] The current-limiting resistor R1 is connected to the current-limiting control module inside the low-dropout linear regulator U1. The current-limiting resistor R1 is within a certain range, and the larger the resistance value, the lower the current-limiting point of the output current. Specifically, the relationship between the current limiting resistor R1 and the output...

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PUM

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Abstract

The invention discloses a low-dropout linear regulated power supply in the field of low-dropout linear power supplies. The circuit comprises a low dropout linear regulator, a soft start capacitor, a divider resistor, a loop compensation capacitor and an output filter capacitor, one end of the soft start capacitor is grounded, the other end of the soft start capacitor is connected with the low dropout linear regulator, an input pin of the input end of the low dropout linear regulator is connected with input voltage, and the input voltage is grounded and connected with the input filter capacitor; one end of the divider resistor is grounded, the other end of the divider resistor is connected to an output pin of the low-dropout linear regulator, and the output end of the divider resistor is connected with the low-dropout linear regulator. Two ends of the output filter capacitor are respectively grounded and connected with output voltage; one end of the loop compensation capacitor is connected with the low dropout regulator, and the other end is connected with output voltage. According to the invention, the magnitude of the output voltage can be adjusted through the divider resistor, the duration of the soft start time is adjusted through the soft start capacitor, and the low-dropout linear regulated power supply is comprehensively configured, so that the low-dropout linear regulated power supply adapts to the market demand.

Description

technical field [0001] The invention relates to the field of low-dropout linear power supplies, in particular to a low-dropout linear stabilized voltage supply. Background technique [0002] The linear regulated power supply has the advantages of fast adjustment speed, small ripple, and low interference, making it widely used in digital circuits, signal processing circuits and other circuits that require high power supply quality. Among them, the low-dropout linear regulated power supply works normally under a smaller input voltage and output voltage difference. [0003] In some applications, the system needs to configure the power-on sequence, current limiting protection point and output voltage of the low-dropout linear regulated power supply. At present, the existing technology cannot conveniently configure the above-mentioned functions and adjustments for the low-dropout linear regulated power supply. The size of the specific numerical values ​​of the above functions. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05F1/56
CPCG05F1/56
Inventor 邹扬张志阳刘佳慧郝克鹏张石磊赵隆冬
Owner NO 43 INST OF CHINA ELECTRONICS TECH GRP CETC