Multi-mode step-down DC-DC converter in-chip soft start circuit

A soft start circuit and soft start technology, applied in the direction of output power conversion devices, electrical components, etc., can solve problems such as damage to circuits and peripheral devices, system power loss, etc., to suppress overshoot current, protect power switches, and improve overall performance. efficiency effect

Active Publication Date: 2015-07-15
INST OF ELECTRONICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to solve the possible damage to the circuit and peripheral devices caused by the overshoot current in the start-up phase of the switch-type DC-DC converter, and at the same time cause the loss of system power, the purpose of the present invention is to provide a fast Soft-start circuit with low power consumption

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  • Multi-mode step-down DC-DC converter in-chip soft start circuit
  • Multi-mode step-down DC-DC converter in-chip soft start circuit
  • Multi-mode step-down DC-DC converter in-chip soft start circuit

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Embodiment Construction

[0019] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be described in further detail below in conjunction with specific embodiments and with reference to the accompanying drawings.

[0020] A typical application of the multi-mode step-down DC-DC (direct current-direct current) converter chip soft-start circuit proposed by the present invention is as follows: figure 1 As shown, wherein, the off-chip device is used to set the application environment of the chip, and the on-chip device mainly includes a pulse width modulation (PWM, Pulse Width Modulation) module, a pulse frequency modulation (PFM, Pusle Frequency Modulation) module, a pulse skip modulation ( PSM, Pulse Skip Modulation) module, a mode controller for controlling the above modulation modes; a logic control module for controlling the on-chip PSM module, PFM module, PWM module and modulation mode selection signal; a driver for driving a power ...

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Abstract

The invention discloses a soft start circuit which is used for protecting chips by a multi-mode step-down DC-DC converter in the starting stage. The large overshoot current of the DC-DC converter in the starting stage easily causes damage to a power switch, and the power losses of the chips are increased. According to the soft start circuit, a charging current generator is used for charging a capacitor, a current limiting circuit is used for detecting the voltage on the capacitor in real time to output the current limiting voltage, and therefore the safety soft start of the chips is guaranteed. Through a soft start process finishing judgment circuit, the soft start circuit enables the chips to work under the soft start and normal working states in real time, and a turn-off circuit can be used for turning off partial non-working circuits of the chips according to the modulation modes of the chips. By means of the soft start scheme provided by the soft start circuit, the overshoot current in the starting stage can be effectively restrained, accordingly, power switches of the chips are protected, and the efficiency of the chips is improved.

Description

technical field [0001] The invention relates to the technical field of power supply management, in particular to an on-chip soft start circuit of a multi-mode step-down DC-DC (direct current-direct current) converter. Background technique [0002] One of the main factors restricting the development of portable communication and entertainment electronic terminals is the working time of the battery. The fast and smooth switching of the power system from the standby state to the working state can reduce the power loss caused by the power supply, thereby prolonging the working time of the battery. Since the output capacitor of the voltage management chip needs to be charged from 0V to the expected voltage value during the startup process, this will cause a large overshoot current during the charging process (Kimio SHIBATA, Cong-Kha PHAM, ADC-DC Converter Using A High Speed ​​Soft-Start Control Circuit, Circuits and Systems (ISCAS) Proceeding of 2010 IEEE International Symposium ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M1/36H02M1/32
Inventor 张春红杨海钢韦援丰屈小钢张甲余乐何辉
Owner INST OF ELECTRONICS CHINESE ACAD OF SCI
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