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FEATURESDESCRIPTION
UDG−97047−1
CAM CAO
OVP
ovp (+ 17.5%)
OV
ov (+ 9%)
VSNS
VFB
电压
放大器
电流
放大器
3 v
UV
uv (−9%)
S
R
Q
Turn
在
延迟
电流 sense
放大器
RT
PWRGD
VDRVHI
GATEHI
PGND
反对 交叉
情况
转变
在
延迟
RT
VDRVLO
GATELO
Foldback
电流
限制
1.37 v
VSNS
X16
竞赛
ISOUT
IS−
IS+
输出 补偿
5 v ref
D0
D1
D2
D3
D4
d/c 转换器
2 v − 3.5 v, 100 mv
或者
1.3 v − 2.05 v, 50 mv
COMMAND
CT RT
OSC
VIN
10.5 v/10 v
UVLO
4.3 v/4.2 v
5 v
REF
地
VREF
VIN
EN
4
6
15
16
8
7
27
26
24
23
22
6
1
20 14
13
2
19
18
12
10
11
28
21
9
17
ucc3882/-1
SLUS294A–MARCH1999–REVISEDOCTOBER2005
AVERAGECURRENTMODESYNCHRONOUS
controllerwith5-bitdac
•
combineddac/voltagemonitorandpwm
TheUCC3882combineshighprecisionreferenceand
WithSynchronousRectificationFunctions
voltagemonitoringcircuitrywithaveragecurrent
modePWMsynchronousrectificationcontroller
•
5-bitdigital-至-相似物(dac)转换器
circuitrytopowerhigh-endmicroprocessorswitha
•
1%dac/referencecombinedaccuracy
minimumofexternalcomponents.theucc3882
•
Compatiblewith5Vand12VSystemsand12
converts5Vor12Vtoanadjustableoutputranging
v-onlysystems
from1.8vdcto2.05vdcin50mvstepsand
2.1vdcto3.5vdcin100mvstepswith1%dc
•
LowOffsetCurrentSenseAmplifier
systemaccuracy.
•
ProgrammableOscillatorFrequencyPractical
to700kHz
•
FoldbackCurrentLimiting
•
OvervoltageandUndervoltageFaultWindows
•
2-
Ω
TotemPoleOutputswithProgrammable
deadtimestoeliminatecross-传导
•
ChipDisableFunction
BLOCKDIAGRAM
pleasebeawarethatanimportantnoticeconcerningavailability,standardwarranty,anduseincriticalapplicationsoftexas
instrumentssemiconductorproductsanddisclaimerstheretoappearsattheendofthisdatasheet.
productiondatainformationiscurrentasofpublicationdate.
copyright©1999–2005,texasinstrumentsincorporated
ProductsconformtospecificationsperthetermsoftheTexas
instrumentsstandardwarranty.productionprocessingdoesnot
necessarilyincludetestingofallparameters.
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