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Soft start device and method

A soft start and power tube technology, applied in the field of soft start, can solve the problems of SOC chips not working properly, and achieve the effect of eliminating voltage overshoot and surge current and protecting the circuit

Active Publication Date: 2014-01-22
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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  • Soft start device and method

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Experimental program
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Embodiment Construction

[0020] Hereinafter, the present invention will be further described in detail through specific embodiments in conjunction with the drawings.

[0021] Reference figure 1 , 2A A soft start device shown includes 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 a power tube 13 connected to the power input terminal VIN and an error amplifier 12 for adjusting the on-resistance of the power tube 13 are provided. 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, and then the power tube 13 is turned on after a predetermined time to connect the voltage regulator circuit 14 Power input (control the power tube 13 to turn on the input power connected to the power input terminal VIN after a predetermined time).

[0022] When implementing, combine Figure 3A , 3B As shown, the power tub...

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PUM

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Abstract

The invention discloses a soft start device and method. The soft start device and method are suitable for voltage regulators, especially for non-capacitive voltage regulators. According to the device, a power-on current control module is additionally arranged on the basis of an existing voltage regulator circuit, and used for detecting a power connection end and controlling a power tube of a voltage regulator to be conducted and connected to a power supply after a preset time when detecting that power input exists at the power connection end. According to the corresponding method, the power tube is controlled to be conducted and connected to the power supply after the preset time when the power input end is detected. According to the soft start device and method, voltage overshoot and surge current in the fast power-on process from the time when the power supply is turned on to the time when the power tube is connected to the power supply are eliminated, and the circuit is protected.

Description

Technical field [0001] The present invention relates to a soft start technology, in particular to a soft start device and method for a voltage regulator (VR: Voltage Regulator), especially a capacitor-less voltage regulator (Cap-less VR). Background technique [0002] The voltage regulator has the advantages of low power consumption, few external components, and low 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 becoming 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 (Error Amplifier), a PMOS power tube 13 (enhanced power PMOS tube; enhanced NMOS can also be used here Power tube...

Claims

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Application Information

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IPC IPC(8): G05F1/56
Inventor 张均军孙轶群
Owner NATIONZ TECH INC
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