參數資料
型號： L9821
廠商： 意法半導體
英文描述： High Side Driver(高邊驅動器)
中文描述： 高側驅動器（高邊驅動器）
文件頁數： 4/7頁
文件大?。?/td> 68K
代理商： L9821
FUNCTIONAL DESCRIPTION
TheL9821isa highsidedrivemonolithicswitch,dri-
ven by TTL,CMOS input logic, able to supplyresi-
stive or inductive loads up to 6A DC allowing a
currentpeakof 25A witha R
DS(ON)
=0.1. The elec-
tronicswitch,inadditiontoitsmainfunction,protects
itself, the power networkand the load againstload
dump (upto 60V)and overloadand it detectsshort
circuit, open load and overtemperatureconditions.
All these functions(logic controland power actua-
tion)arepossibleon asinglechipthankstothe new
mixedSTMultipowerBCDtechnologythatallowsto
integrateisolated DMOS power transistorsin com-
binationwithBipolarandCMOSsignalstructureson
thesame chip.
The high side drive connection (series switch bet-
weentheloadandthepositivepowersource)is par-
ticularlysuitedinautomotiveenvironmentwherethe
electrochemicalcorrosionwithstandinghasprimary
importance.For thisconnectionthebest solutionis
a PowerMOS N-channelwhich requiresfordriving
only a capacitivecharge pump completely integra-
tedon theswitch chip.
The L9821is based on a power DMOS seriesele-
ment,a drivingcircuit with a chargepump,an input
logicinterfaceandon someprotectionand faultde-
tectioncircuits.
The power DMOS transistor has a R
DS(ON)
= 0.1
(typ.value@ T
J
=25
°
C,V
GS
= 10V).Thelow value
of R
DS(ON)
is important both to increase the power
transferred to the load and to minimize the power
dissipatedin the device.
Thechargepumpisa capacitivevoltagetriplerstar-
ting from power supply (car battery), driven by a
500kHzoscillator.
The input interface is based on a circuitry solution
able to guaranteethe stability over temperatureof
theTTL logic levels andvery low quiescentcurrent
in OFFcondition.
When the supply reaches the maximum operating
voltage(32V) the device is turnedOFF, protecting
itselfandtheload; moreoverlocalzenerclampsare
providedin somecritical pointsto avoidthatV
GS
of
any MOS transistor could reachdangerousvalues
even during60V load dumptransient.
The inrushcurrent limitingis a significantfeatureof
theL9821.Thisfunctionallowsto protectthepower
supplynetworkandmayextendthelifeoftheloads.
Forexample,in thecaseof thelamps,the tungsten
wireresistancevalue in coldconditionis aboutone
tenthofthenominalsteadystateandthentheinrush
current during the turn on is statistically one of the
main causes of lamps failures. If the high current
condition persists (e.g. load short circuit) and the
junctiontemperaturerisesabove150
°
C,thethermal
protectioncircuitturnsoffthedevicepreventingany
damage.The current limiting and the thermalshut-
downaresufficientto protectthedeviceagainstany
overloadbecausethe powerDMOShasnotthe se-
cond breakdown.
When the L9821 is driven and one of the protec-
tions (overtemperature, overvoltage, overload) is
present, a fault detection open drain output turns
on. This output is active also when I
load
is lower
than0.6Adetectingtheopenload (disconnectedor
burned out). The diagnostic output detects fault
conditions with 25ms delay in order to avoid spu-
rious diagnosys(i.e. : turn on overcurrent,overvol-
tage spikes etc.). In OFF conditions the fault
detectioncircuits arenot activeto allow a minimum
quiescentcurrent.
The devicecan drive unipolarDCmotors andsole-
noidsaswellbecauseitcanrecirculate aninductive
current when the output voltage goes lower than
V
clamp
value (typically - 6.5V in respect to ground).
The possibility to have a start up current is useful
also for DC motors allowing the maximum starting
torque.
TYPICAL APPLICATION OF THE L9821
The L9821 integratedhigh side driver can be used
to replacean electromechanicalrelay.
Inductiveload(i.e.solenoids,motors)canbedriven
bytheL9821.Noexternalcomponentsarerequired
forthecoilcurrentrecirculation,becausethedevice
providesthis functioninternally.
L9821
4/7
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相關代理商/技術參數
參數描述
L9822 功能描述:功率驅動器IC Octal Ser Solenoid RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
L9822E 功能描述:功率驅動器IC Octal Ser Solenoid RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
L9822E_02 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:OCTAL SERIAL SOLENOID DRIVER
L9822ED 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:OCTAL SERIAL SOLENOID DRIVER
L9822EPD 功能描述:功率驅動器IC Octal Ser Solenoid RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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