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ACST2 Series
AC Switch family Alternating current switch
Main features
Symbol IT(RMS) VDRM/VRRM IGT

OUT
Value 2 800 10
Unit
COM
G
A V mA
G OUT COM
Overvoltage crowbar technology High noise immunity: static dV/dt > 500 V/s
TO-220FPAB ACST2-8SFP
DPAK ACST2-8SB
The ACST2-8SFP in the TO-220FPAB package provides insulation voltage rated at 1500VRMS
Benefits

Enables equipment to meet IEC 61000-4-5 High off-state reliability with planar technology Needs no external overvoltage protection Reduces component count Interfaces directly with the micro-controller High immunity against fast transients described in IEC 61000-4-4 standards
Main application

AC ON/OFF static switching in appliances & industrial control systems Drive of low power highly resistive or inductive loads like: - solenoid, - pump, fan, micro-motor
Order code
Part number ACST2-8SFP ACST2-8SB Marking ACST28S ACST28S
Description
The ACST2 series belongs to the AC power switch family built around the ASD technology. This high performance device is adapted to home appliances or industrial systems and drives loads up to 2 A. This ACST2 switch embeds a Triac structure with a high voltage clamping device to absorb the inductive turn-off energy and withstand line transients such as those described in the IEC 61000-4-5 standards. The component needs a low gate current to be activated (IGT < 10 mA) and in the mean time provides a high electrical noise immunity such as those described in the IEC 61000-4-4 standards.
Functional diagram
OUT
G
COM
March 2007
Rev 1
1/11
www.st.com 11
Characteristics
ACST2 Series
1
Table 1.
Symbol IT(RMS)
Characteristics
Absolute maximum ratings (limiting values)
Parameter TO-220FPAB RMS on-state current (full sine wave) DPAK Non repetitive surge peak on-state current (full cycle sine wave, TJ initial = 25 C) I t Value for fusing Critical rate of rise of on-state current IG = 2 x IGT, tr = 100 ns Non repetitive line peak mains voltage (1) Average gate power dissipation Peak gate power dissipation (tp = 20 s) Peak gate current (tp = 20 s) Storage junction temperature range Operating junction temperature range Maximum lead soldering temperature during 10 s (at 3 mm from plastic case)
Value Tc = 105 C Tc = 110 C t = 16.7 ms t = 20 ms 8.4 8.0 0.5 Tj = 125 C Tj = 25 C Tj = 125 C Tj = 125 C Tj = 125 C 50 2 0.1 10 1.6 -40 to +150 -40 to +125 260 2
Unit A
F = 60 Hz F = 50 Hz tp = 10 ms F = 120 Hz
A
ITSM It dI/dt VPP (1) PG(AV) PGM IGM Tstg Tj Tl
A s A/s kV W W A C C
1. according to test described by IEC 61000-4-5 standard and Figure 16
Table 2.
Symbol IGT(1) VGT VGD IH (2) IL dV/dt (2) (dI/dt)c (2) VCL
Electrical characteristics (Tj = 25 C, unless otherwise specified)
Test conditions VOUT = 12 V RL = 33 VOUT = 12 V RL = 33 VOUT = VDRM RL = 3.3 k Tj = 125 C IOUT = 100 mA I - III IG = 1.2 x IGT VOUT = 67% VDRM gate open Tj = 125 C (dV/dt)c = 15 V/s Tj = 125 C ICL = 0.1 mA tp = 1 ms Tj = 25 C II Quadrant I - II - III I - II - III I - II - III MAX MAX MIN MAX MAX MAX MIN MIN MIN Value 10 1.1 0.2 10 25 mA 35 500 0.5 850 V/s A/ms V Unit mA V V mA
1. minimum IGT is guaranteed at 5% of IGT max 2. for both polarity of OUT pin referenced to COM pin
2/11
ACST2 Series Table 3.
Symbol VTM(1) VTO
(1)
Characteristics
Static electrical characteristics
Test conditions ITM = 2.8 A tp = 500 s Threshold voltage Dynamic resistance VOUT = VDRM / VRRM Tj = 25 C Tj = 125 C Tj = 125 C Tj = 25 C Tj = 125 C MAX MAX MAX MAX 0.5 mA Value 2 0.9 250 10 Unit V V m A
RD(1) IDRM IRRM
1. for both polarity of OUT pin referenced to COM pin
Table 4.
Symbol Rth(j-c)
Thermal resistances
Parameter DPAK Junction to case (AC) TO-220FPAB TO-220FPAB Junction to ambient 7 C/W 60 70 Value 4.5 Unit
Rth(j-a)
SCU (1)= 0.5 cm
DPAK
1. SCU = copper surface under tab
Figure 1.
P(W)
2.8
=180
Maximum power dissipation versus Figure 2. RMS on-state current (full cycle)
IT(RMS)(A)
2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6
180
RMS on-state current versus case temperature
2.4 2.0 1.6 1.2 0.8 0.4 IT(RMS)(A) 0.0 0.0 0.2 0.4 0.6 0.8 1.0 1.2 1.4 1.6 1.8 2.0
DPAK
TO-220FPAB
0.4 0.2 0.0 0
=180
TC(C) 25 50 75 100 125
3/11
Characteristics
ACST2 Series
Figure 3.
RMS on-state current versus ambient temperature
Figure 4.
Relative variation of thermal impedance versus pulse duration TO-220FPAB
IT(RMS) (A)
1.8 1.6 1.4 1.2 1.0
=180 Printed circuit board FR4 Natural convection SCU=0.5 cm
1.00
K=[Zth/Rth]
Zth(j-c)
Zth(j-a)
0.10
0.8 0.6 0.4 0.2 0.0 0 25 50 75 100 125 Tamb(C)
TO-220FPAB
0.01 1.0E-04 1.0E-03 1.0E-02
tP(s) 1.0E-01
1.0E+00 1.0E+01 1.0E+02 1.0E+03
Figure 5.
Relative variation of thermal Figure 6. impedance versus pulse duration DPAK
Relative variation of gate trigger current IGT, holding current IH and latching current IL versus junction temperature (typical values)
1.0E+00
K=[Zth/Rth]
IGT, IH, IL [T J] / IGT, IH, IL [T j=25 C]
2.8 2.6 2.4 2.2 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 0.2 0.0
IGT
Zth(j-c)
IL & IH
1.0E-01
Zth(j-a)
DPAK
1.0E-02
tP(s)
Tj(C) -40 -30 -20 -10 0 10 20 30 40 50 60 70 80 90 100 110 120 130
1.0E-04 1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03
Figure 7.
Relative variation of static dV/dt versus junction temperature
Figure 8.
Relative variation of critical rate of decrease of main current versus reapplied dV/dt (typical values)
VOUT=300 V
dV/dt [T j] / dV/dt [T j=125 C]
100
VOUT=540 V
2.0 1.8 1.6 1.4 1.2
(dI/dt)c [ (dV/dt) c ] / Specified (dI/dt) c
10
1.0 0.8 0.6 0.4 0.2
T j(C)
1 25 50 75 100 125
0.0 0.1 1.0
(dV/dt)c(V/s) 10.0 100.0
4/11
ACST2 Series
Characteristics
Figure 9.
Relative variation of critical rate of decrease of main current versus junction temperature
Figure 10. Surge peak on-state current versus number of cycles
(dI/dt)c [T j] / (dI/dt)c [T j=125 C]
20 18 16 14 12 10
VOUT=300 V
9 8 7 6 5 4
ITSM (A)
t=20ms
Non repetitive Tj initial=25 C
One cycle
8 6 4 2 0 25 50 75 100 125 T j(C)
3 2 1 0 1
Repetitive TC=110 C
Number of cycles 10 100 1000
Figure 11. Non repetitive surge peak on-state Figure 12. On-state characteristics (maximum values) current for a sinusoidal pulse with width tP < 10 ms, and corresponding value of It
100.0
ITSM(A), It (As)
Tj initial=25 C
1.E+01
ITM(A)
ITSM
10.0
1.E+00
Tj=125 C
Tj=25 C
1.0
It
1.E-01
TJ max. : VTO= 0.90 V RD= 250 mW
0.1 0.01
tP(ms) 0.10 1.00 10.00
VTM(V) 1.E-02 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
4.0
4.5
5.0
Figure 13. Thermal resistance junction to ambient versus copper surface under tab (printed circuit board FR4, eCU = 35 m) (DPAK)
Rth(j-a) (C/W)
100
DPAK
Figure 14. Relative variation of clamping voltage VCL versus junction temperature
VCL [T j] / VCL [T j=25 C]
1.20 1.15 1.10 1.05 1.00 0.95 0.90
90 80 70 60 50 40 30 20 10 0 0 5 10 15 SCU(cm) 20 25 30 35 40
T j(C) 0.85 -40 -20 0 20 40 60 80 100 120 140
5/11
AC line switch basic application
ACST2 Series
2
AC line switch basic application
The ACST2 device has been designed to switch on and off highly inductive or resistive loads such as pump, valve, fan, or bulb lamp. Thanks to its high sensitivity (IGT max = 10 mA), the ACST2 can be driven directly by logic level circuits through a resistor as shown on the typical application diagram. Thanks to its thermal and turn-off commutation performances, the ACST2 switch can drive, without any additional snubber, an inductive load up to 2 A. Figure 15. Typical application diagram
Line
L AC Mains R
AC LOAD
ACST2 Rg MCU
Power supply
2.1
Protection against overvoltage: the best choice is ACST
In comparison with standard triacs, which are not robust against surge voltages, the ACST2 is over-voltage self-protected, specified by the new parameter VCL. In addition, ACST2 is a sensitive device (IGT = 10mA), but provides a high noise immunity level against fast transients. The ACST2 switch is able to sustain safely the AC line transient voltages either by clamping the low energy spikes or by breaking over under high energy shocks, even with fast turn-on current rises. The test circuit of the Figure 16 is representative of the final ACST2 application, and is also used to stress the ACST switch according to the IEC 61000-4-5 standard conditions. Thanks to the load limiting the current, the ACST switch sustains the voltage spikes up to 2 kV above the peak line voltage. The protection is based on an overvoltage crowbar technology. Actually, the ACST2 will break over safely as shown on Figure 17. The ACST is recovering its blocking voltage capability at the next zero current crossing point. Such non repetitive test can be done 10 times on each AC line voltage polarity.
6/11
ACST2 Series
Ordering information scheme
Figure 16. Overvoltage ruggedness test circuit Figure 17. Typical current and voltage for resistive and inductive loads waveforms across the ACST2 according to IEC 61000-4-5 during IEC 61000-4-5 standard test standards: R = 200 , L = 10 H, Vpp = 2 kV
Surge generator
2kV surge
VOUT (200 V/div)
Filtering unit
Rgene Model of the load L R
IOUT (500 mA/div)
AC Mains
ACST2-8x Rg
2.2
Electrical noise immunity
Even if the ACST2 is a sensitive device (IGT = 10 mA) and can be controlled directly though a simple resistor by a logic level circuit, it provides a high electrical noise immunity. The intrinsic immunity of the ACST2 is shown by the specified dV/dt equal to 500 V/s @ 125 C. This immunity level is 5 to 10 times higher than the immunity provided by an equivalent standard technology triac with the same sensitivity. In other word, ACST2 is sensitive, but has an immunity reaching the one provided by non-sensitive device (IGT higher than 35 mA).
3
Ordering information scheme
ACST 2 - 8
AC Switch series Current 2 = 2 ARMS Voltage 8 = 800 V Sensitivity S = 10 mA Package FP = TO-220FPAB B = DPAK Packing TR = Tape and reel (DPAK) Blank = Tube (TO-220FPAB, DPAK)
S
FP -TR
7/11
Package information
ACST2 Series
4
Package information
Epoxy meets UL94, V0 TO-220FPAB dimensions
Dimensions Ref. Millimeters Min. A
A H B
Table 5.
Inches Min. 0.173 0.098 0.098 0.018 0.030 0.045 0.045 0.195 0.094 0.393 Max. 0.181 0.106 0.108 0.027 0.039 0.067 0.067 0.205 0.106 0.409
Max. 4.6 2.7 2.75 0.70 1 1.70 1.70 5.20 2.7 10.4
4.4 2.5 2.5 0.45 0.75 1.15 1.15 4.95 2.4 10
B D E
Dia L6 L2 L3 L5 F1 L4 F2 D L7
F F1 F2 G G1 H L2
E
16 Typ. 28.6 9.8 2.9 15.9 9.00 3.00 30.6 10.6 3.6 16.4 9.30 3.20
0.63 Typ. 1.126 0.386 0.114 0.626 0.354 0.118 1.205 0.417 0.142 0.646 0.366 0.126
F G1 G
L3 L4 L5 L6 L7 Dia.
8/11
ACST2 Series Table 6. DPAK dimensions
Package information
Dimensions Ref. Millimeters Min. A
E B2 C2 L2 A
Inches Min. 0.086 0.035 0.001 0.025 0.204 0.017 0.018 0.236 0.251 0.173 0.368 Max. 0.094 0.043 0.009 0.035 0.212 0.023 0.023 0.244 0.259 0.181 0.397
Max. 2.40 1.10 0.23 0.90 5.40 0.60 0.60 6.20 6.60 4.60 10.10
2.20 0.90 0.03 0.64 5.20 0.45 0.48 6.00 6.40 4.40 9.35
A1 A2 B B2
D
H L4 B G A1
R
C C2
R C
D E
A2 0.60 MIN.
G H
V2
L2 L4 V2
0.80 typ. 0.60 0 1.00 8
0.031 typ. 0.023 0 0.039 8
Figure 18. Footprint (dimensions in mm)
6.7 3 3 1.6
2.3 6.7 2.3
1.6
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
9/11
Ordering information
ACST2 Series
5
Ordering information
Part number ACST2-8SFP ACST2-8SB ACST2-8SB-TR Marking ACST28S ACST28S ACST28S Package TO-220FPAB DPAK DPAK Weight 2.4g 0.3g 0.3g Base Qty 50 50 2500 Packing mode Tube Tube Tape and Reel
6
Revision history
Date 01-Mar-2007 Revision 1 Initial release. Changes
10/11
ACST2 Series
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