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Manual Fairchild AN-7502

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  • Fairchild AN-7502 - page 1

    ©2002 Fairch ild Semicond uctor Corpo ration Application No te 7502 Rev. A1 AN-7502 Power MOSFET Swit ching Wavefo rms: A New Insight The examination of power MOSFET voltage an d current wa vef or ms du ring switching t ransition s rev eal s that t he device characte rizati on now practiced by ind ustry is i nade- quate . I n this Note, device wav ...

  • Fairchild AN-7502 - page 2

    ©2002 Fairch ild Semicond uctor C orpo ration Application N ote 7502 Rev. A1 FIGURE 4. IDEALIZED POWER MOSFET WAVEFORMS FIGURE 5. STEP-VOLTAGE FORCING FUNCTION P ower MOSFET devices are hi ghly ca paci ti ve in nature; hence , simp le ca pacitor re sponses to the f orcing funct ions off er a g ood v ehicle for comparison. The ad vant ageous choice ...

  • Fairchild AN-7502 - page 3

    ©2002 Fairch ild Semicond uctor C orpo ration Application N ote 7502 Rev. A1 Stat e 2: MOS A ctIv e, JFET ActIv e This st ate gr aphic ally illust rates the dram atic inf luence that the JFET has on the po wer MOSF ET drain -vol tage wa ve- f orm. Instead of ha ving to discharge C x from V DD to gr ound, the later al MOSFET ne ed only s wing V X t ...

  • Fairchild AN-7502 - page 4

    ©2002 Fairch ild Semicond uctor C orpo ration Application N ote 7502 Rev. A1 FIGURE 9. NORMALIZED RFM15N15 SWITCHING WAVE- FORMS FOR CANSTANT GATE-CURRENT DRIVE. Step-V oltag e Ga te Drive The majori ty of power MO SFET applica tions emplo y a step gate- voltag e input wit h a finite source re sistance R O . Ofte n R O f or turn-on is not the same ...

  • Fairchild AN-7502 - page 5

    ©2002 Fairch ild Semicond uctor C orpo ration Application N ote 7502 Rev. A1 Experimental V erification Since the s witching equa tions for step current s and voltages diff er only by gat e-current ma gnitudes f or the same de vice type , one wo uld e xpect a plot of sw itching time v ersus 1/R O to be of the s ame form as thos e obtai ned for a s ...

  • Fairchild AN-7502 - page 6

    ©2002 Fairch ild Semicond uctor C orpo ration Application N ote 7502 Rev. A1 F or pea k gate volta ges othe r than 10 v olts , and l oad resi s- tances other tha n BV DSS /I D(MAX) , the equati ons of T a ble 1 ma y be used i n conjun ction w ith sl ope esti mates f rom the chara cte rizati on curve s f or C X and C GS + C X (1 + g M /g MJ ) at th ...

  • Fairchild AN-7502 - page 7

    ©2002 Fairch ild Semicond uctor C orpo ration Application N ote 7502 Rev. A1 Tu r n - O n State 1: M OS Off, JFE T Off I PK1 = V G /R O State 2: MO S Active, JFET Ac tive I PK2 = (V G - V GS(TH) )/R O State 3: MOS Ac tive, JFET Saturated I PK3 = (V G - V G(SA T) )/R O T urn-Off State 4: MOS S aturated, JFET S aturated I PK4 = V G /R O State 5: MOS ...

  • Fairchild AN-7502 - page 8

    ©2002 Fairch ild Semicond uctor C orpo ration Application N ote 7502 Rev. A1 Case 3 :Common-So urce Gate Drive, Figure B-3 FIGURE B-3. COMMON-SOURCE GATE-DRIVE CIRCUIT Tu r n - O n R O = R D (drain -to-gro und capacitan ce of driving de vice adds to C GS of driven MOSFET .) Tu r n O f f R O = r DS(ON) of driving MOSFET w hen R D is ver y much gr e ...

  • Fairchild AN-7502 - page 9

    DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY , FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICA TION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS P A TENT RIGHTS, NOR ...

Manufacturer Fairchild Category Projector

Documents that we receive from a manufacturer of a Fairchild AN-7502 can be divided into several groups. They are, among others:
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- AN-7502 manuals
- Fairchild product data sheets
- information booklets
- or energy labels Fairchild AN-7502
All of them are important, but the most important information from the point of view of use of the device are in the user manual Fairchild AN-7502.

A group of documents referred to as user manuals is also divided into more specific types, such as: Installation manuals Fairchild AN-7502, service manual, brief instructions and user manuals Fairchild AN-7502. Depending on your needs, you should look for the document you need. In our website you can view the most popular manual of the product Fairchild AN-7502.

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A complete manual for the device Fairchild AN-7502, how should it look like?
A manual, also referred to as a user manual, or simply "instructions" is a technical document designed to assist in the use Fairchild AN-7502 by users. Manuals are usually written by a technical writer, but in a language understandable to all users of Fairchild AN-7502.

A complete Fairchild manual, should contain several basic components. Some of them are less important, such as: cover / title page or copyright page. However, the remaining part should provide us with information that is important from the point of view of the user.

1. Preface and tips on how to use the manual Fairchild AN-7502 - At the beginning of each manual we should find clues about how to use the guidelines. It should include information about the location of the Contents of the Fairchild AN-7502, FAQ or common problems, i.e. places that are most often searched by users in each manual
2. Contents - index of all tips concerning the Fairchild AN-7502, that we can find in the current document
3. Tips how to use the basic functions of the device Fairchild AN-7502 - which should help us in our first steps of using Fairchild AN-7502
4. Troubleshooting - systematic sequence of activities that will help us diagnose and subsequently solve the most important problems with Fairchild AN-7502
5. FAQ - Frequently Asked Questions
6. Contact detailsInformation about where to look for contact to the manufacturer/service of Fairchild AN-7502 in a specific country, if it was not possible to solve the problem on our own.

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