Soft start device and method

A soft-start and circuit technology, applied in the field of soft-start, can solve the problem of SOC chip not working normally, and achieve the effect of avoiding voltage and current shock and reducing transient current

Active Publication Date: 2014-01-22
NATIONZ TECH INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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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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Embodiment Construction

[0024] The present invention will be further described in detail below through specific embodiments in conjunction with the accompanying drawings.

[0025] Such as Figure 2A As shown, a soft start device includes a voltage regulator circuit 14 and a voltage establishment speed control module 11, the voltage regulator circuit 14 is provided with a power tube 13 connected to the power supply inlet and is used to adjust the power tube 13 The error amplifier 12 of the conduction resistance; the voltage establishment speed control module 11 is used to control the output voltage EA_OUT of the error amplifier 12, so that the output voltage VOUT of the voltage regulator circuit 14 rises to a predetermined rate when the circuit is established. stable value. This circuit works after the power-up current control circuit to reduce the transient current during the establishment of the loop operating point.

[0026] The stable value refers to the output voltage VOUT generated by the erro...

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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 voltage buildup and speed control module is additionally arranged on the basis of an existing voltage regulator circuit and used for controlling the output voltage of an error amplifier, and therefore the output voltage of the voltage regulator circuit can rise to a stable value at a preset speed in the circuit establishment process. According to the corresponding method, the output voltage of the voltage regulator circuit rises to the stable value at the preset speed. Due to the adoption of the scheme, voltage and current impact caused after a power tube is conducted is avoided, and transient current generated in the establishment process of a loop working point is reduced.

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 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 (Error Amplifier), a PMOS power transistor 13 (enhanced power PMOS transistor; enhanced NMOS can also be used here Power...

Claims

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Application Information

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