ACST8-8CFP ,OVER VOLTAGE PROTECTED AC POWER SWITCHFEATURESn V /V = +/- 800VDRM RRMn Avalanche controlled devicen I = 8A with T =90°CT(RMS) CASEn High ..
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ACST8-8CFP
OVER VOLTAGE PROTECTED AC POWER SWITCH
ACST8-8COVER VOLTAGE PROTECTED
AC POWER SWITCH VDRM /VRRM= +/- 800V Avalanche controlled device IT(RMS)= 8A with TCASE =90°C High noise immunity: static dV/dt> 750 V/μs Gate triggering current: IGT <30mA Snubberless turnoff commutation:(dI/dt)c> 4.5A/ms TO-220FPAB package
FEATURESThe ACST8-8C belongsto the AC power switch
family built around the ASD technology. This high
performance deviceis adaptedto home appliances industrial systems and drivesan induction motorto 8A.
This ACST switch embedsa triac structure witha
high voltage clamping deviceto absorb the inductive
turnoff energy and withstand line transients suchas
those describedin the IEC61000-4-5 standards.
DESCRIPTION Enables equipmentto meet EN61000-4-5standard High off-state reliability with planar technology Needno external overvoltage protection Reduces the power component count
BENEFITS
FUNCTIONAL DIAGRAM: AC static switchingin appliance& industrialcontrol systems Washing machine with bi-rotational inductionmotor drive Induction motor drive for:- refrigerator/ freezer compressorair conditioning compressor
MAIN APPLICATIONSASD™ Switch Family
ACST8-8C
Note1: accordingtotest describedby IEC61000-4-5 standard& FigureA.
ABSOLUTE RATINGS (limiting values)
GATE CHARACTERISTICS (maximum values)
THERMAL RESISTANCE
PARAMETER DESCRIPTION
ACST8-8C
ELECTRICAL CHARACTERISTICS PER SWITCHFor either positiveor negative polaryof pin OUT voltage respectto pin COM voltage
The ACST8-8C deviceis especially designedto drive medium power induction motorsin washing ma-
chines, refrigerators, dish washers, and tumble dryers.
Pin COM : Common drive reference,tobe connectedto the power line neutral
PinG : Switch Gate inputtobe connectedto the controller
Pin OUT : Switch Outputtobe connectedto the load
When driven froma low voltage controller, the ACST switchis triggered witha negative gate current flow-
ing outof the gate pinG.It canbe drivenby the controller througha resistoras shownon the typical appli-
cation diagram.In appliance systems, the ACST8-8C switch intendsto drive medium power loadin ON/
OFF full cycleor phase angle control mode.
Thankstoits thermal and turn-off commutation characteristics, the ACST8-8C switchis ableto drive inductive loadupto 8A withouta turn-off aid snubber circuit. washing machineor drier appliances, the tumble rotatesin both directions. When using bidirectional
phase shift induction motor, two switches are connectedon each sideof the phase shift capacitor:in
steady-state operation, one switch only conducts energising the coils and defining the tumble direction.
LINE SWITCH BASIC APPLICATION
ACST8-8C
TYPICAL APPLICATION DIAGRAM
ROBUSTNESS AGAINST FAST CAPACITOR DISCHARGE
When parasitic transientsor controller mis-operation occur, the blocked switch may turnonby spurious
switch firing. Since the phase shift capacitoris charged,its energyis instantaneously dissipated through
the two ACSTs which canbe destroyed.To prevent sucha failure,a resistive inductive circuit R-Lis added series with the phase shift capacitor.
The dI/dt dependson the maximal voltage Vmaxof the phase shift capacitor (700Von 240V mains applica-
tions), andon the inductanceL:= max
The total switch turnon di/dtis the sumof the di/dt createdby any RC noise suppressor discharge and the
dI/dt createdby the motor capacitor discharge.
Since the maximal di/dt capabilityat turn-onof the ACST8is 100A/μs, the motor capacitor di/dtis assumedbe less than 50A/μs; therefore, the inductance shouldbe 14μH.
The resistorR limits the surge current through the ACST8 during the capacitor discharge accordingto the
specified curve ITSM=f (tp)as shownin Figure6(tobe issued), and 1.2Ωis low enoughto limit the resistor
dissipation (usually less than1 W).
Finally both the 14μH inductance and the 1.2Ω resistance providea safety marginof twoon the surge cur-
rent ITSM describedin Figure6.
ACST8-8C
The ACST8-8C switchis ableto safely withstand the AC line transient voltages eitherby clamping the low
energy spikesorby breaking over under high energy shocks.
The test circuitin FigureAis representativeof the ACST application andis usedto test the ACST switch
accordingto the IEC61000-4-5 standard conditions. Thanksto the load impedance, the ACST switch with-
stands voltage spikesupto2 kV above the peak line voltageby breaking over safely. Such non repetitive
testing canbe done10 timeson each AC line voltage polarity. LINE TRANSIENT VOLTAGE RUGGEDNESS
Fig.A: Overvoltage ruggedness test circuitfor resistive and inductive loads
accordingto IEC61000-4-5 standardR=47Ω,L=10μH&VPP= 2kV
01234 5678
P(W)
Fig.1: Maximum power dissipation versus RMS
on-state current. 25 50 75 100 125
IT(RMS)(A)
Fig. 2-1: RMS on-state current versus case
temperature.
ACST8-8C
2.5 25 50 75 100 125
IT(RMS)(A)
Fig. 2-2: RMS on-state current versus ambient
temperature.
1.E-03
1.E-02
1.E-01
1.E+00
1.E-03 1.E-02 1.E-01 1.E+00 1.E+01 1.E+02 1.E+03
K = [Zth/Rth]
Fig.3: Relative variationof thermal impedance
versus pulse duration.
100 234 56
Iout(A)
Fig. 4: On-state characteristics (maximum val-
ues). 10 100 1000
ITSM(A)
Fig.5: Surge peak on-state current versus number cycles.
0.01 0.10 1.00 10.00
ITSM(A),I t(A s)22
Fig.6: Non repetitive surge peak on-state current
fora sinusoidal pulse with widthtp< 10ms, and
corresponding valueofI2t.
IGT,IH, IL[Tj]/IGT,IH, IL[Tj=25°C]
Fig.7: Relative variationof gate trigger current,
holding current and latching current versus junc-
tion temperature (typical values).
