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Constant current and voltage controller carrying out pin multiplexing and a three-pin package

A technology of integrated circuits and controllers, applied in the field of switch mode power supply circuits, can solve the problems of increasing manufacturing costs and expensive IC packaging.

Inactive Publication Date: 2009-12-16
ACTIVE SEMI SHANGHAI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Generally, IC packages with more pins are more expensive than IC packages with fewer pins
[0003] In addition, the discrete external components of the flyback converter 10 will also increase the manufacturing cost

Method used

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  • Constant current and voltage controller carrying out pin multiplexing and a three-pin package
  • Constant current and voltage controller carrying out pin multiplexing and a three-pin package
  • Constant current and voltage controller carrying out pin multiplexing and a three-pin package

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Embodiment Construction

[0057] Reference will now be made in detail to certain embodiments of the invention, examples of which are illustrated in the accompanying drawings.

[0058] image 3 is a diagram of a flyback converter 30 having a controller integrated circuit (IC) 31 packaged in an integrated circuit package 32 . Although the term "integrated circuit" is often used to refer to both an integrated circuit and an integrated circuit package in which an integrated circuit is housed, the term "integrated circuit" is used herein to refer only to an integrated circuit die. The flyback converter 30 includes a transformer for converting the output voltage to a different output voltage. In one embodiment, the input voltage is a voltage from a wall outlet and the output voltage is used to charge a portable electronic user device. When the main power switch in the converter is turned on, current begins to flow through the primary inductor of the transformer. The collapsing magnetic field around the pr...

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PUM

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Abstract

The present invention relates to a constant current and voltage controller carrying out pin multiplexing and a three-pin package for carrying out low-cost flyback converters. A flyback converter includes a controller integrated circuit (IC) housed in an IC package with only three terminals. An inexpensive TO-92 transistor package can be used. A switch terminal is coupled to an inductor switch that is turned on by a switch control signal having a frequency and a pulse width. The inductor switch controls the current that flows through a primary inductor of the flyback converter. The controller IC adjusts the frequency in a constant current mode such that output current remains constant and adjusts the pulse width in a constant voltage mode such that output voltage remains constant. A power terminal receives a feedback signal that is derived from a voltage across an auxiliary inductor of the flyback converter. The feedback signal provides power to the controller IC and is also used to generate the switch control signal. The controller IC is grounded through a ground terminal.

Description

technical field [0001] The invention relates to the field of power conversion, in particular to a switching mode power supply circuit which only uses three pins to regulate output current and output voltage. Background technique [0002] Various integrated circuit chips are currently used to control flyback converters that provide constant current and constant voltage. figure 1 (Prior Art) An exemplary prior art constant output current flyback converter 10 is illustrated, which is controlled on the primary side of a transformer 11 . Although the flyback converter 10 saves the cost of optocouplers typically used in secondary-side controlled converters, the flyback converter 10 requires the use of a relatively expensive integrated circuit package. The flyback converter 10 includes an integrated circuit package with six pins for mating with a conventional peak current mode pulse width modulation (PWM) controller integrated circuit (IC) 12 . Typically, IC packages with more pi...

Claims

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Application Information

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IPC IPC(8): H01L23/48H01L23/58H01L23/482H01L21/60H02M7/04
CPCH01L2924/0002H02M2001/0006H02M3/33507H02M3/33569H02M1/0006H01L2924/00
Inventor 陶志波龚大伟黄树良
Owner ACTIVE SEMI SHANGHAI
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