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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 APPLICATION OR USE OF ANY PRODUCT

OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT

RIGHTS, NOR THE RIGHTS OF OTHERS.

TRADEMARKS

The following are registered and unregistered trademarks Fairchild Semiconductor owns or is authorized to use and is

not intended to be an exhaustive list of all such trademarks.

LIFE SUPPORT POLICY

FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT

DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF FAIRCHILD SEMICONDUCTOR CORPORATION.

As  used  herein:

1. Life support devices or systems are devices or

systems which, (a) are intended for surgical implant into

the body, or (b) support or sustain life, or (c) whose

failure  to  perform  when  properly  used  in  accordance

with instructions for use provided in the labeling, can be

reasonably expected to result in significant injury to the

user.

2. A critical component is any component of a life

support device or system whose failure to perform can

be reasonably expected to cause the failure of the life

support device or system, or to affect its safety or
effectiveness.

PRODUCT STATUS DEFINITIONS

Definition  of  Terms

Datasheet  Identification

Product Status

Definition

Advance Information

Preliminary

No Identification Needed

Obsolete

This datasheet contains the design specifications for

product development. Specifications may change in

any manner without notice.

This datasheet contains preliminary data, and

supplementary data will be published at a later date.

Fairchild Semiconductor reserves the right to make

changes at any time without notice in order to improve

design.

This datasheet contains final specifications. Fairchild

Semiconductor reserves the right to make changes at

any time without notice in order to improve design.

This datasheet contains specifications on a product

that has been discontinued by Fairchild semiconductor.

The datasheet is printed for reference information only.

Formative or

In Design

First Production

Full Production

Not In Production

MICROWIRE™

OPTOLOGIC

OPTOPLANAR™

PACMAN™

POP™

Power247™

PowerTrench

QFET™

QS™

QT Optoelectronics™

Quiet Series™

FAST

FASTr™

FRFET™

GlobalOptoisolator™

GTO™

HiSeC™

I

2

ISOPLANAR™

LittleFET™

MicroFET™

MicroPak™

Rev. H5

â

ACEx™

Bottomless™

CoolFET™

CROSSVOLT

™

DenseTrench™

DOME™

EcoSPARK™

E

2

CMOS

TM

EnSigna

TM

FACT™

FACT Quiet Series™

SILENT SWITCHER

SMART START™

SPM™

STAR*POWER™

Stealth™

SuperSOT™-3

SuperSOT™-6

SuperSOT™-8

SyncFET™

TinyLogic™

TruTranslation™

â

â

â

STAR*POWER is used under license

UHC™

UltraFET

VCX™

â

Содержание SEMICONDUCTOR AN-7502

Страница 1: ...nds Device Models The keystone of an understanding of power MOSFET switching performance is the realization that the active device is bimodal and must be described using a model that accounts for the...

Страница 2: ...tate 1 MOS Off JFET Off In a power MOSFET device no drain current will flow until the device s gate threshold voltage Vgs TH is reached Dur ing this time the gate s current drive is only charging the...

Страница 3: ...t5 VDK VD SAT Cx lG State 4 MOS Saturated JFET Saturated Turn Off In this state in addition to gMJVX being shorted the gMVG cur rent generator is shorted and IG is occupied with charging CX and CGS in...

Страница 4: ...switching time versus 1 RO to be of the same form as those obtained for a step current drive This is exactly the case as Figure 10 is merely a vari ation of Figure 8 Using the relationships of Table 1...

Страница 5: ...complexity FIGURE 10 CONSTANT GATE VOLTAGE SWITCHING TIME Using the Characterization Curve Figure 9 To estimate the switching times for an RFM15N15 power MOSFET under the conditions VG 10V VDD 75V RO...

Страница 6: ...and the 90 level by another Device comparisons based on the classical switching definition can be very misleading Appendix A Analysis for Resistive Step Voltage Inputs Step Voltage Gate Drive To obtai...

Страница 7: ...time The equivalent circuit then predicts State 4 Mos Saturated JFET Saturated Turn off Both equivalent circuit generators are short circuits and the gate drive is discharging CX in parallel with CGS...

Страница 8: ...on Source Gate Drive Figure B 3 FIGURE B 3 COMMON SOURCE GATE DRIVE CIRCUIT Turn On RO RD drain to ground capacitance of driving device adds to CGS of driven MOSFET Turn Off RO rDS ON of driving MOSFE...

Страница 9: ...ife support device or system or to affect its safety or effectiveness PRODUCT STATUS DEFINITIONS Definition of Terms Datasheet Identification Product Status Definition Advance Information Preliminary...

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