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ACST10
Transient protected AC power switch
Features
OUT

Triac with overvoltage crowbar technology Low IGT (<10 mA) or high immunity (IGT<35 mA) version High noise immunity: static dV/dt > 2000 V/s
G OUT COM G OUT COM
Benefits

Enables equipment to meet IEC 61000-4-5 High off-state reliability with planar technology Need no external over voltage protection Reduces the power passive component count High immunity against fast transients described in IEC 61000-4-4 standards
TO-220AB ACST10-7xT
TO-220FPAB ACST10-7xFT
Figure 1.
Functional diagram
OUT
Applications

AC mains static switching in appliance and industrial control systems Drive of medium power AC loads like: - Universal drum motor of washing machine - Compressor for fridge or air conditioner Table 1.
Symbol
G COM
Description
The ACST10 series belongs to the ACS/ACST family built with the ASD (application specific discrete) technology. This high performance device is adapted to home appliances or industrial systems, and drives loads up to 10 A. This ACST10 switch embeds a TRIAC structure and a high voltage clamping device able to absorb the inductive turn-off energy and withstand line transients such as those described in the IEC 61000-4-5 standards. The ACST10-7S needs only low gate current to be activated (IGT < 10 mA) and still shows a high noise immunity complying with IEC standards such as IEC 61000-4-4 (Fast transient burst test). The ACST10-7C offers an extremely high static dV/dt immunity of 2 kV/s minimum.
Device summary
Value 10 700 10 or 35 Unit A V mA
IT(RMS) VDRM/VRRM IGT
December 2008
Rev 1
1/12
www.st.com
Characteristics
ACST10
1
Table 2.
Symbol IT(RMS)
Characteristics
Absolute ratings (limiting values)
Parameter TO-220AB On-state rms current (full sine wave) TO-220FPAB Non repetitive surge peak on-state current Tj initial = 25 C, ( full cycle sine wave) I t for fuse selection Critical rate of rise on-state current IG = 2 x IGT, (tr 100 ns) Non repetitive line peak pulse voltage (1) Average gate power dissipation Peak gate power dissipation (tp = 20 s) Peak gate current (tp = 20 s) Storage temperature range Operating junction temperature range
F = 120 Hz
2
Value Tc = 105 C Tamb = 84 C tp = 16.7 ms tp = 20 ms tp = 10 ms Tj = 125 C Tj = 25 C Tj = 125 C Tj = 125 C Tj = 125 C 105 100 66 100 2 0.1 10 1 -40 to +150 -40 to +125 10
Unit A A A A2s A/s kV W W A C C
F = 60 Hz F = 50 Hz
ITSM I2 t
dI/dt VPP PG(AV) PGM IGM Tstg Tj
1. According to test described in IEC 61000-4-5 standard and Figure 17
Table 3.
Symbol IGT(1) VGT VGD IH(2) IL
Electrical characteristics
Value Test conditions VOUT = 12 V, RL = 33 VOUT = 12 V, RL = 33 VOUT = VDRM, RL = 3.3 IOUT = 500 mA IG = 1.2 x IGT I - II - III Quadrant I - II - III I - II - III I - II - III Tj ACST10-7Sx 25 C 25 C 125 C 25 C 25 C 125 C 125 C Without snubber ICL = 0.1 mA, tp = 1 ms 25 C MAX. MAX. MIN. MAX. MAX. MIN. MIN. 12 MIN. 850 V 30 50 200 4.4 A/ms 10 1.0 0.2 50 70 2000 ACST10-7Cx 35 mA V V mA mA V/s Unit
dV/dt(2) VOUT = 67 % VDRM, gate open (dI/dt)c(2) VCL (dV/dt)c = 15 V/s
1. Minimum IGT is guaranteed at 5% of IGT max 2. For both polarities of OUT pin referenced to COM pin
2/12
ACST10 Table 4.
Symbol VTM(1) VT0(1) Rd(1) IDRM IRRM
Characteristics Static characteristics
Test conditions IOUT = 14.1 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. MAX. Value 1.5 0.9 35 20 1.2 Unit V V m A mA
1. For both polarities of OUT pin referenced to COM pin
Table 5.
Symbol Rth(j-c) Rth(j-a)
Thermal characteristics
Parameter TO-220AB Junction to case (AC) TO-220FPAB Junction to ambient TO-220AB TO-220FPAB 3.5 60 C/W C/W Value 1.7 Unit C/W
3/12
Characteristics
ACST10
Figure 2.
P(W)
12 11 10 9 8 7 6 5
Maximum power dissipation vs. rms on-state current (full cycle)
Figure 3.
IT(RMS)(A)
11
On-state rms current vs. case temperature (full cycle)
TO-220AB
10 9 8 7 6 5 4 TO-220FPAB
4 3 2 1 0 0 1 2 3 4
3 2 TC(C)
IT(RMS)(A)
5 6 7 8 9 10
1 0 0 25 50 75 100 125
Figure 4.
On-state rms current vs. ambient Figure 5. temperature (free air convection full cycle)
1.0E+00
Relative variation of thermal impedance vs. pulse duration
IT(RMS)(A)
3,0
K=[Zth/Rth]
TO-220AB
Zth(j-c) Zth(j-a)
2,5 TO-220FPAB 2,0
1,5
1.0E-01
1,0
TO-220AB TO-220FPAB Tamb(C) tp(s)
0,5
0,0 0
25
50
75
100
125
1.0E-02 1.0E-03
1.0E-02
1.0E-01
1.0E+00
1.0E+01
1.0E+02
1.0E+03
Figure 6.
On-state characteristics (maximal values)
Figure 7.
Non repetitive surge peak on-state current vs. number of cycles (Tj initial = 25 C)
100
ITM(A)
110 100 90 80 70 60 50 40 30 20 10 0
5
ITSM(A)
t=20ms
Non repetitive Tj initial=25 C
One cycle
ITM (A)
10
Tj=125 C
Tj=25 C
VTM(V)
2 3 4
Tj max : Vto = 0.90 V Rd = 35 m
Repetitive TC=105 C
Number of cycles
10 100
1 0 1
1
4/12
ACST10
Characteristics
Figure 8.
Non repetitive surge peak on-state Figure 9. current for a sinusoidal pulse and corresponding value of It
dI/dt limitation: 100 A/s
Relative variation of gate triggering current (IGT) and gate triggering voltage vs. junction temperature
10000
ITSM(A), I2t (A2s)
3.0
Tj initial=25 C
IGT, VGT,[Tj/IGT[Tj = 25 C]
IGTQ3
2.5
1000
ITSM
IGTQ1-Q2 2.0
100
It
1.5
1.0
VGTQ1-Q2-Q3
10
tp(ms)
1 0.01 0.10 1.00 10.00
0.5
Tj(C)
0.0 -50 -25 0 25 50 75 100 125
Figure 10. Relative variation of holding (IH) and latching current (IL) vs. junction temperature
2.5
Figure 11. Relative variation of critical rate of decrease of main current (di/dt)c vs. (dV/dt)c
1.6 1.4
IH,IL[TJ]/IH,IL[Tj = 25 C]
(di/dt)c [(dV/dt)c] / Specified (di/dt)c
2.0
1.2
ACST10-7Cxx
1.5
1.0
Typical values
1.0
IL IH
0.8 0.6 0.4 0.2 0.0 0.1
ACST10-7Sxx
0.5
TJ(C)
0.0 -50 -25 0 25 50 75 100 125
(dV/dt)c (V/s)
1 10 100
Figure 12. Relative variation of critical rate of decrease of main current (di/dt)c vs. junction temperature
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Figure 13. Relative variation of static dV/dt vs. junction temperature
(dV/dt)[Tj] / (dV/dt)[Tj = 125 C]
VD = VR = 460 V
(dI/dt)c[Tj] / (dI/dt)c[Tj=125C]
11 10 9 8 7 6 5 4 3 2
Tj(C)
25 50 75 100 125
1 0 25 50
Tj(C)
75 100 125
5/12
Characteristics
ACST10
Figure 14. Relative variation of maximum clamping voltage, VCL vs. junction temperature
1.15
VCL[Tj] / VCL[Tj = 25 C]
1.10
1.05
1.00
Minimum values
0.95
0.90
tj(C)
0.85 -50 -25 0 25 50 75 100 125
6/12
ACST10
Application information
2
2.1
Application information
Typical application description
The ACST10 device has been designed to control medium power load, such as AC motors in home appliances. Thanks to its thermal and turn off commutation performances, the ACST10 switch is able to drive, with no turn off additional snubber, an inductive load up to 10 A. It also provides high thermal performances in static and transient modes such as the compressor inrush current or high torque operating conditions of an AC motor. Thanks to its low gate triggering current level, the ACST10-7S can be driven directly by an MCU through a simple gate resistor as shown Figure 15. Figure 15. Compressor control - typical diagram
Compressor
Compressor
AC Mains
AC Mains
PTC
ACST
2
Electronic starter
logical circuitry
PTC
1
ACST
Start switch Run switch
ACST
ACST
Electronic thermostat
Rg
3
Rg
Rg
Power supply
Gate Driver
Power supply
Gate Driver
Figure 16. Universal drum motor control - typical diagram
Universal motor
Stator
Rotor
12V AC Mains
Motor direction setting
MCU
Speed motor regulation
ACST
Rg
Vcc MCU
7/12
Ordering information scheme
ACST10
2.2
AC line transient voltage ruggedness
In comparison with standard TRIACs, which are not robust against surge voltage, the ACST10 is self-protected against over-voltage, specified by the new parameter VCL. The ACST10 switch can safely withstand AC line transient voltages either by clamping the low energy spikes or by switching to the on state (for less than 10 ms) to dissipate higher energy shocks through the load. This safety feature works even with high turn-on current rises. The test circuit of Figure 17 represents the ACST10 application, and is used to stress the ACST switch according to the IEC 61000-4-5 standard conditions. Thanks to the load which is limiting the current, the ACST switch withstands the voltage spikes up to 2 kV above the peak line voltage. The protection is based on an overvoltage crowbar technology. The ACST10 switches safely to the on state as shown in Figure 18. The ACST10 recovers its blocking voltage capability after the surge. Such a non repetitive test can be done at least 10 times on each AC line voltage polarity.
Figure 17. Overvoltage ruggedness test circuit Figure 18. Typical current and voltage for resistive and inductive loads for waveforms across the ACST10 during IEC 61000-4-5 standard test IEC 61000-4-5 standards
R = 8 , L = 4 H, Vsurge = 2 kV
Surge generator 2kV surge
VPEAK = V CL VOUT IOUT
Model of the load R L ACST12
Rgene
Filtering unit
L AC Mains C
Rg
3
Ordering information scheme
Figure 19. Ordering information scheme
ACST 10 - 7 C T
AC Switch On-state rms current 10 = 10A Repetitive peak off-state voltage 7 = 700V Triggering gate current S = 10 mA C = 35 mA Package FP = TO-220FPAB T = TO-220AB
8/12
ACST10
Package information
4
Package information

Epoxy meets UL94, V0 Recommended torque: 0.4 to 0.6 N*m
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. Table 6. TO-220AB dimensions
Dimensions Ref. Millimeters Min. A C
H2 Dia L5 L7 L6 L2 F2 F1 L9 L4 F G1 G M E D C A
Inches Min. 0.173 0.048 0.094 0.019 0.024 0.044 0.044 0.194 0.094 0.393 Max. 0.181 0.051 0.107 0.027 0.034 0.066 0.066 0.202 0.106 0.409
Max. 4.60 1.32 2.72 0.70 0.88 1.70 1.70 5.15 2.70 10.40
4.40 1.23 2.40 0.49 0.61 1.14 1.14 4.95 2.40 10
D E F F1 F2 G G1 H2 L2 L4 L5 L6 L7 L9 M Diam.
16.4 typ. 13 2.65 15.25 6.20 3.50 14 2.95 15.75 6.60 3.93
0.645 typ. 0.511 0.104 0.600 0.244 0.137 0.551 0.116 0.620 0.259 0.154
2.6 typ. 3.75 3.85
0.102 typ. 0.147 0.151
9/12
Package information Table 7. TO-220FPAB dimensions
Dimensions Ref. Millimeters Min. A
A H B
ACST10
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 0.059 0.059 0.205 0.106 0.409
Max. 4.6 2.7 2.75 0.70 1 1.50 1.50 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 Diam.
10/12
ACST10
Ordering information
5
Ordering information
Table 8. Ordering information
Marking ACST107S ACST10-7SFP ACST10-7CT ACST107C ACST10-7CFP TO-220FPAB 2.3 g 50 Tube TO-220FPAB TO-220AB 2.3 g 2.3 g 50 50 Tube Tube Package TO-220AB Weight 2.3 g Base qty 50 Packing mode Tube
Order code ACST10-7ST
6
Revision history
Table 9.
Date 02-Dec-2008
Document revision history
Revision 1 First issue Changes
11/12
ACST10
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