Voltage-stabilizing circuit with hiccup mode over-current protection function

Abstract

The invention discloses a voltage-stabilizing circuit with a hiccup mode over-current protection function, which mainly solves the problem that the hiccup mode over-current protection function in the prior art cannot be easily integrated, and the problem of overlarge current in a soft-starting stage during a continuous overcurrent period. The voltage-stabilizing circuit, disclosed by the invention, comprises a hiccup mode control circuit, a soft-starting circuit, an error amplifier circuit, a current limiting circuit, a feedback resistor and a regulating circuit; the hiccup mode control circuit comprises a continuous overcurrent detection circuit, a dormancy time circuit, an overload removal detection circuit and a control circuit to control the soft-starting circuit to repeatedly start when the continuous overcurrent is detected so that the circuit works in a hiccup mode, and input ends of the hiccup mode control circuit and the current limiting circuit are connected with a turn-back current limiting circuit to detect an output voltage state and reduce current in a soft-starting stage during the continuous overcurrent period. The voltage-stabilizing circuit, disclosed by the invention, has high reliability; the hiccup mode over-current protection function can be totally integrated inside a chip and can be applied to various power management systems.

Description

technical field [0001] The invention belongs to the technical field of electronic circuits, and relates to an analog integrated circuit, in particular to a voltage stabilizing circuit with a hiccup mode overcurrent protection function, which can be used in power management systems. Background technique [0002] At present, the trend of voltage regulator circuit chips is to integrate power discrete devices into the chip as much as possible, which means that the power consumption inside the chip will become larger, especially when overload or even short circuit occurs, the power tube will pass through for a long time. Large current may cause the circuit to overheat and burn out. The overcurrent protection methods in the voltage regulator circuit include maximum current limit, foldback current limit and hiccup mode overcurrent protection. [0003] The maximum current limit means that when the load is greater than the set maximum value, the output current is limited to this max...

AI Technical Summary

Problems solved by technology

However, the existing hiccup mode overcurrent protection function is realized by analog circuit, the design is complex and requires an external capacitor for timing control, it is not easy to be fully integrated, which increases the cost of the application; and in the soft start stage, due to the continuous high output current, There is still a certain risk of damage to the voltage regulator circuit

Images