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A soft start device and method

A soft-start, power tube technology, applied in the field of soft-start, can solve problems such as the SOC chip not working normally, and achieve the effect of eliminating voltage overshoot and inrush current, and protecting the circuit

Active Publication Date: 2016-08-03
NATIONZ TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the instantaneous surge current of VR is not controlled, the SOC chip may not work properly

Method used

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  • A soft start device and method

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Embodiment Construction

[0020] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0021] refer to figure 1 , 2A A soft start device is shown, including a voltage regulator circuit 14 and a power-on current control module 10. The voltage regulator circuit 14 is the same as the prior art, in which there is a power transistor 13 connected to the power input terminal VIN and an error amplifier 12 for adjusting the on-resistance of the power transistor 13 . The power-on current control module 10 is used to detect the power input terminal VIN, and when the external power input is detected, the power tube 13 is turned off first, and then the power tube 13 is turned on after a predetermined time to make the voltage regulator circuit 14 connected. input power (control the power tube 13 to turn on the input power input to the power input terminal VIN after a predetermined time).

[0022] When implemented, combined wit...

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PUM

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Abstract

The invention discloses a soft start device and method, which are suitable for voltage regulators, especially capacitorless voltage regulators. The device adds a power-on current control module on the basis of the existing voltage regulator circuit. The power-on current control module is used to detect the power input end, and when it is detected that the power input end has a power input, control the voltage The power tube of the regulator is turned on and connected to the power supply after a predetermined time; the corresponding method is to control the power tube to be connected to the power supply after a predetermined time after detecting the power access terminal; the device and method are The period from power on to power tube access to power supply eliminates voltage overshoot and surge current during fast power-on, and protects the circuit.

Description

technical field [0001] The present invention relates to a soft start technology, in particular to a soft start (Soft Start) device and method for a voltage regulator (VR: Voltage Regulator), especially a cap-less voltage regulator (Cap-less VR). Background technique [0002] The voltage regulator has the advantages of low power consumption, few external components, and small electromagnetic interference. It is used in a system on chip (SOC: system on chip) chip as a power management unit. Especially in portable devices such as mobile phones and personal mobile terminals, the power consumption requirements of SOC chips are increasingly strict, and voltage regulators without external capacitors have been widely used. see figure 1 As shown, the circuit components of the voltage regulator usually include: a reference source VREF (reference voltage), an error amplifier 12 (ErrorAmplifier), a PMOS power transistor 13 (enhanced power PMOS transistor; enhanced NMOS power can also b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G05F1/56
Inventor 张均军孙轶群
Owner NATIONZ TECH INC
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