CN102313869B

CN102313869B - Method for settling and screening three-terminal fixed voltage regulation integrated circuit

Info

Publication number: CN102313869B
Application number: CN201110220586.9A
Authority: CN
Inventors: 赵振华
Original assignee: WUXI ROUM SEMICONDUCTOR TECHNOLOGY Co Ltd
Current assignee: Jiangsu Donghai Semiconductor Co., Ltd
Priority date: 2011-08-03
Filing date: 2011-08-03
Publication date: 2014-07-02
Anticipated expiration: 2031-08-03
Also published as: CN102313869A

Abstract

The invention discloses a method for settling and screening a three-terminal fixed voltage regulation integrated circuit and relates to a method for rapidly screening an electronic component in the settlement environment. The method comprises the following steps of: connecting the three-terminal fixed voltage regulation integrated circuit onto a transistor characteristic curve tracer, so that a positive/negative scanning voltage is switched between an input terminal and a common terminal of the three-terminal fixed voltage regulation integrated circuit, i.e. the common terminal is connected to an emitting electrode terminal of the curve tracer, the input terminal is connected to a collecting electrode terminal of the curve tracer and an output terminal is connected to a base electrode terminal of the curve tracer; setting a peak test voltage range of the transistor characteristic curve tracer as 45V, setting a current range as 50mA, setting a series resistance gear in the range of 100 to 200 ohms, placing a step amplitude gear at a voltage gear, setting an input switch normal, and placing a step action switch at an off position; and then powering on and judging the advantages and the disadvantages of the tested three-terminal fixed voltage regulation integrated circuit according to a waveform displayed by the transistor characteristic curve tracer. The method has visual results, is simple and convenient to operate and is convenient to use.

Description

Acceptance, the screening technique of the fixing integrated regulator of three ends

Technical field

The present invention relates to the screening technique of a kind of electronic product before acceptance method and the product warehousing at shipping and receiving scene.

Background technology

The fixing integrated regulator of three ends is a kind of device that electronic equipment is conventional, is widely used in various electronic equipments.

At present, the filler test of integrated circuit manufacturing firm to integrated circuit, major part is all to adopt key parameter test condition suitably to add sternly, the process of disposable test, so the application reliability of circuit of three-terminal voltage-stabilizing integrated on complete machine is subject to certain limitation.The manufacturing firm higher for technical merit, the quality of production is stable, does like this and can ensure that product has certain reliability level.But for the not overripened integrated circuit manufacturing firm of technical merit, quality management, product quality risk is just larger, easily there is mass discrepancy between batches, easily produce the indivedual batches of upper higher phenomenons of machine crash rate.In actual production, technological fluctuation is unavoidable, but in the time that fluctuation exceeds standard, likely in a part or minority product, produce internal stress, and these internal stresss are often difficult for by disposable test screening totally in production test, the accumulation that need the time, the condition such as temperature, environment and load changes, just can come out, so manufacturing firm is before product export, be necessary oneself first to do experiment, qualified just can dispatch from the factory afterwards to be tested.

For user, while receiving outsourcing device, must fulfil IPQC(and buy quality management), Zuo Ru factory acceptance test.These Concepts of Quality Managements have clearly regulation in ISO9001 quality management system standard.But up to the present,, owing to lacking one on-the-spot acceptance method fast and effectively, by the three-terminal voltage-stabilizing circuit of buying, no matter reliably whether directly go up machine, until power on while debugging, just exposure problem, causes unnecessary loss.

User's later inspection of receiving, generally adopts D.C. regulated power supply, adds a testing cassete, does a fictitious load, the stabilizing voltage characteristic of pointwise test circuit.This method complicated operation, speed are slow, can not promote the use of at acceptance scene.And on-the-spot first step that quality is checked on often of acceptance avoids substandard product warehouse-in can reduce follow-up a lot of operation.

Summary of the invention

The object of the invention is according to the on-the-spot actual conditions of acceptance, scene is pressed for time, in the simple situation of equipment, invents a kind of quick acceptance, screening technique for the fixing integrated regulator of three ends.

Method of the present invention is: fixing three ends integrated regulator is received on a transistor curve tracer, make to access positive/negative scanning voltage between the input end of the fixing integrated regulator of three ends and common port, it is the emitter terminal that common port is connected on graphic instrument, input end is connected on collector terminal, and output terminal is connected on base terminal; The peak value test voltage range of transistor curve tracer is set as to 45V, and current range is set as 50mA, and resistance in series gear is set as 100 ~ 200 Europe, and ladder amplitude gear is placed in voltage gear, and input switch is placed in normally, and ladder-effect switch is placed in and closes position.Then power up, judge the quality of the fixing integrated regulator of three tested ends according to the display waveform of transistor curve tracer.

The waveform of concrete specification product is: electric current is in Y-axis, the voltage oscillogram that is X-axis; 0 ~ 7V rapidly increases to 25mA left and right place; after current stabilization to 38,39V; almost straight line declines and is stabilized in 6mA left and right; until V more than 40, the wherein interval waveform of 7-38,39V, has shown the voltage regulation performance of circuit of three-terminal voltage-stabilizing integrated; 38, the interval waveform of 39V-45V, has shown the superpotential automatic protection functions of circuit of three-terminal voltage-stabilizing integrated.At voltage stabilized range, if any obvious projection or pit, or in superpotential interval, automatically do not protect waveform, be all the waveform of defective products.

Preferred method is: fixing three tested ends integrated regulator is heated to uniform temperature, and simulation actual working state carries out heat and surveys.Concrete grammar is that fixing three tested ends integrated regulator is placed on electric hot plate, and electric hot plate surface temperature is 80-90 DEG C, and criterion of acceptability is constant.

The beneficial effect of the inventive method is easy to use, with low cost, and index is directly perceived, and test speed is fast, is applicable to the rapid screening of acceptance environment.

Brief description of the drawings

Fig. 1, the waveform schematic diagram of the inventive method specification product.

Fig. 2, the oscillogram 1 of defective products.

Fig. 3, the oscillogram 2 of defective products.

Embodiment

Transistor curve tracer is a kind of instrument that is generally used for test analysis transistor, diode and mos field effect transistor.Conventional have Multiple Types such as QT2, DH4821, YD4812, ES-30, ES-810, and the present embodiment describes as an example of QT2 example.

The fixing integrated regulator of three ends has 78 series of positive supply output and 79 series of negative supply output, has 7805,7806,7809,7812 ... 7824,7905,7906,7909,7912 ... the models such as 7924, can be suitable for the inventive method.

Three ends of the fixing integrated regulator of three ends are respectively input end, common port and output terminal, and the maximum input voltage of its product specification is 35V.

Screening step under concrete acceptance environment:

1, test product is divided on electric hot plate, its common port (heat sink) contact electric hot plate surface, by electric hot plate surface temperature control in 80-90 DEG C.

2, the parameter of QT2 transistor curve tracer is set: peak value test voltage range is set as 45V, and current settings is 50mA, resistance in series gear is set as 100 ~ 200 Europe, ladder amplitude gear is placed in voltage gear, and input switch is placed in " normally ", and ladder-effect switch is placed in off-position.If test 78 serial circuit of three-terminal voltage-stabilizing integrated, instrument is arranged at " NPN " state, if test 79 serial circuit of three-terminal voltage-stabilizing integrated, instrument is arranged at " PNP " state.

3, the testing cassete that fixing test three ends integrated regulator is used is connected on QT2 transistor curve tracer, three splicing ears of testing cassete and the corresponding relation of graphic instrument interface are: common port---emitter terminal, input end---collector terminal, output terminal---base terminal.

4, measured device is taken off and is inserted in integrated circuit testing box socket from electric hot plate one by one, start to test optical viewer display screen.As shown in Figure 1, electric current is that in Y-axis, the voltage oscillogram that is X-axis, 0 ~ 7V rapidly increases to 25mA left and right place to normal product figure, and after current stabilization to 38,39V, almost straight line declines and is stabilized in about 6mA, until V more than 40.If defective products, graphic illustration will have open defect, and main manifestations is to have obvious projection or pit in voltage stabilizing interval (7-37V), as shown in Figure 2; Or cannot enter voltage stabilizing interval, there is no horizontal linear section, as shown in Figure 3.

5, by changing " resistance in series " gear on instrument, for example be reduced to 100 Ω from 200 Ω, can change measuring current and rise to 50mA from 25mA, reach screening object, also can be by raising or reducing electric plate temperature, the way that makes measured device skin temperature raise or reduce, change screening conditions reach the object of reasonable screening.Concrete screening conditions should be determined through overtesting.

It should be noted that, when taking off from electric hot plate, measured device is inserted into after integrated circuit testing box, measured device skin temperature has certain decline, but after test powers up, the shell of measured device can rise again, this be due to device inside junction temperature raise due to, so test speed will be controlled to some extent, test each product and be no more than 1-2 second.Otherwise easily damage device.

Claims

1. the acceptance screening technique of the fixing integrated regulator of three ends, it is characterized in that: fixing three ends integrated regulator is received on a transistor curve tracer, three ends are fixed between the input end of integrated regulator, output terminal and accessed positive/negative scanning voltage, the negative terminal of common port access graphic instrument; The peak value test voltage range of transistor curve tracer is set as to 45V, and current settings is 50 ~ 60mA, and resistance gear is set as 100 ~ 200 Europe, and ladder amplitude gear is placed in voltage gear, and input switch is placed in normally, and ladder-effect switch is placed in and closes position; Then power up, judge the quality of the fixing integrated regulator of three tested ends according to the display waveform of transistor curve tracer, the waveform of concrete specification product is: electric current is in Y-axis, the voltage oscillogram that is X-axis, 0 ~ 7V rapidly increases to 25mA left and right place, and after current stabilization to 38,39V, almost straight line declines and is stabilized in 6mA left and right, until V more than 40, at voltage stabilized range, if any obvious projection or pit, be exactly the waveform of defective products.

2. the acceptance screening technique of the fixing integrated regulator of three ends according to claim 1, is characterized in that: fixing three tested ends integrated regulator is heated to 55 ~ 65 DEG C and tests.