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Power transistor chip with built-in junction field effect transistor and application circuit thereof

A technology of field effect transistors and power transistors, applied in circuits, output power conversion devices, DC power input conversion to DC power output, etc., can solve problems such as complex chip technology, achieve simplified technology, save power consumption, and save cost effect

Active Publication Date: 2010-07-14
RICHTEK TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

No matter which method is used, the depletion-type metal-oxide-semiconductor field-effect transistor 221 or 331 is used as the AC / DC voltage conversion circuit of the startup circuit, and the manufacturing process of the chip will be due to the depletion-type metal-oxide-semiconductor field-effect transistor. The increased channel (N channel or P channel) process of transistor 221 or 331 makes the process of its chip more complicated

Method used

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  • Power transistor chip with built-in junction field effect transistor and application circuit thereof
  • Power transistor chip with built-in junction field effect transistor and application circuit thereof
  • Power transistor chip with built-in junction field effect transistor and application circuit thereof

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Embodiment Construction

[0021] Please refer to Figure 4 As shown, it is a diagram of an AC / DC voltage conversion circuit according to a preferred embodiment of the present invention. The AC / DC voltage conversion circuit 40 can convert the AC power Vin input from the power input terminal 411 into a stable DC power Vo and then output it. . In the figure, the AC / DC voltage conversion circuit 40 includes functional blocks such as a bridge rectifier circuit 41 , a power transistor chip 42 , a pulse width modulation circuit 43 , a transformer circuit 45 , a filter and feedback circuit 46 , and a working power supply circuit 47 .

[0022] As shown in the figure, the power transistor chip 42 has a first pin 421, a second pin 422, a third pin 423, a fourth pin 424, a fifth pin 425, a power transistor 426 and a JFET 427. . It is known that this chip will be used as the junction field effect transistor 427 for the start-up circuit of the AC / DC voltage conversion circuit 40, integrated and built into the powe...

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Abstract

The invention discloses a power transistor chip with a built-in junction field effect transistor and an application circuit thereof. In the power transistor chip with the built-in junction field effect transistor, a junction field effect transistor is taken as a starting circuit of an alternating / direct current voltage conversion circuit so that the operation of the starting circuit can be stopped after a pulse width modulation circuit of the alternating / direct current voltage conversion circuit starts working normally, which saves power consumption. In addition, the junction field effect transistor is built in the power transistor chip. The junction field effect transistor can be manufactured by the same process of a power transistor so that an additional mask and an additional process will not be increased, the process is simplified and the cost is saved.

Description

technical field [0001] The present invention relates to a voltage regulator (Voltage Regulator) circuit, and in particular to a power transistor chip with a built-in Junction Field Effect Transistor (JFET) and an AC / DC voltage conversion circuit using the chip . Background technique [0002] With the rapid evolution of semiconductor technology, such as computers and their peripheral digital products are also being updated day by day. In the integrated circuit (IC for short) of the computer and its peripheral digital products, due to the rapid change of the semiconductor process, there are more diversified demands for the power supply of the integrated circuit, so that the application such as booster (Boost Converter), step-down Various combinations of voltage regulator circuits such as buck converters can be used to meet the different power requirements of various integrated circuits, and this has also become one of the most important factors for providing diversified digit...

Claims

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Application Information

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IPC IPC(8): H01L27/02H01L23/50H02M3/335
CPCH01L2924/0002
Inventor 黄志丰邱国卿
Owner RICHTEK TECH
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