STMICROELECTRONICS ACST12-7CT

ACST12
Transient protected AC power switch
Features
■
Triac with overvoltage crowbar technology
■
Low IGT (<10 mA) or high immunity
(IGT<35 mA) version
■
High noise immunity: static dV/dt > 2000 V/µs
OUT
OUT
G
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
COM
D²PAK
ACST12-7xG
TO-220AB
ACST12-7xT
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
Description
G
COM
Table 1.
The ACST12 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 12 A.
Device summary
Symbol
Value
Unit
IT(RMS)
12
A
VDRM/VRRM
700
V
IGT
10 or 35
mA
This ACST12 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 ACST12-7S 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. The ACST12-7C offers an
extremely high static dV/dt immunity of 2 kV/µs
minimum.
December 2008
Rev 1
1/12
www.st.com
Characteristics
ACST12
1
Characteristics
Table 2.
Absolute ratings (limiting values)
Symbol
IT(RMS)
Parameter
Value
TO-220AB
D²PAK
On-state rms current full sine wave
D²PAK
I2t
Non repetitive surge peak on-state current
Tj initial = 25 °C,( full cycle sine wave)
I2t
12
A
Tamb = 47 °C
2
F = 60 Hz
tp = 16.7 ms
126
A
F = 50 Hz
tp = 20.0 ms
120
A
tp = 10 ms
95
A2s
Tj = 125 °C
100
A/µs
with 1cm² of Cu
ITSM
Tc = 104 °C
Unit
for fuse selection
dI/dt
Critical rate of rise on-state current
IG = 2 x IGT, (tr ≤ 100 ns)
VPP
Non repetitive line peak pulse voltage (1)
Tj = 125 °C
2
kV
Average gate power dissipation
Tj = 125 °C
0.1
W
PGM
Peak gate power dissipation (tp = 20 µs)
Tj = 125 °C
10
W
IGM
Peak gate current (tp = 20 µs)
Tj = 125 °C
1
A
Tstg
Storage temperature range
- 40 to + 150
°C
Operating junction temperature range
- 40 to + 125
°C
PG(AV)
Tj
F = 120 Hz
1. According to test described in IEC 61000-4-5 standard and Figure 19
Table 3.
Electrical characteristics
Value
Symbol
Test conditions
Quadrant
Unit
Tj
ACST12-7Sx
ACST12-7Cx
Unit
10
35
mA
IGT(1)
VOUT = 12 V, RL = 33 Ω
I - II - III
25 °C
MAX.
VGT
VOUT = 12 V, RL = 33 Ω
I - II - III
25 °C
MAX.
1.0
V
VGD
VOUT = VDRM, RL = 3.3 Ω
I - II - III
125 °C
MIN.
0.2
V
IH(2)
IOUT = 500 mA
25 °C
MAX.
30
50
mA
IL
IG = 1.2 x IGT
25 °C
MAX.
50
70
mA
125 °C
MIN.
200
2000
V/µs
MIN.
5.3
I - II - III
dV/dt(2) VOUT = 67% VDRM, gate open
(dI/dt)c(2)
(dV/dt)c = 15 V/µs
125 °C
Without snubber
VCL
ICL = 0.1 mA, tp = 1 ms
1. Minimum IGT is guaranteed at 5% of IGT max
2. For both polarities of OUT pin referenced to COM pin
2/12
A/ms
MIN.
25 °C
14
850
V
ACST12
Characteristics
Table 4.
Static characteristics
Symbol
Test conditions
Value
Unit
VTM(1)
IOUT = 17 A, tp = 500 µs
Tj = 25 °C
MAX.
1.5
V
VT0(1)
Threshold voltage
Tj = 125 °C
MAX.
0.9
V
Rd(1)
Dynamic resistance
Tj = 125 °C
MAX.
30
mΩ
IDRM
IRRM
20
µA
VOUT = VDRM/ VRRM
1.5
mA
Value
Unit
Tj = 25 °C
MAX.
Tj = 125 °C
1. For both polarities of OUT pin referenced to COM pin
Table 5.
Thermal characteristics
Symbol
Parameter
TO-220AB
Rth(j-c)
Junction to case (AC)
Rth(j-a)
Junction to ambient
D²PAK
Figure 2.
Maximum power dissipation vs.
on-state rms current (full cycle)
60
°C/W
D²PAK with 1cm² of Cu
45
°C/W
On-state rms current vs. case
temperature (full cycle)
IT(RMS) (A)
13
α=180 °
12
11
10
9
8
7
6
5
4
3
2
IT(RMS)(A)
TC(°C)
1
0
0
1
2
Figure 4.
3.0
°C/W
TO-220AB
Figure 3.
P(W)
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
0
°C/W
1.5
3
4
5
6
7
8
9
10
11
12
0
25
On-state rms current vs. ambient
Figure 5.
temperature (free air convection full
cycle)
IT(RMS)(A)
1.0E+00
50
75
100
125
Relative variation of thermal
impedance vs. pulse duration
K=[Zth/Rth]
Z th(j-c)
D2PAK
With 1cm2 of cu
Zth(j-a)
2.5
2.0
TO-220AB
1.5
1.0E-01
1.0
0.5
Tamb(°C)
tp(s)
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
3/12
Characteristics
Figure 6.
ACST12
On-state characteristics
(maximum values)
Figure 7.
ITM (A)
1000
Non repetitive surge peak on-state
current vs. number of cycles
(Tj initial = 25 °C)
ITSM(A)
130
120
110
t=20ms
100
90
100
One cycle
Non repetitive
Tj initial=25 °C
80
70
60
50
40
10
30
Tj=125 °C
Tj=25 °C
20
Tj max :
Vto = 0.90 V
Rd = 30 mΩ
VTM (V)
1
Figure 8.
3
4
1
5
10
Non repetitive surge peak on-state Figure 9.
current for a sinusoidal pulse and
corresponding value of I²t
2
10000
2
Number of cycles
0
1
0
Repetitive
TC=104 °C
10
2
ITSM(A), I t (A s)
100
1000
Relative variation of gate triggering
current (IGT) and voltage (VGT) vs.
junction temperature (typical value)
IGT, VGT[Tj] / IGT, VGT[Tj = 25 °C]
3.0
dI/dt limitation: 100 A/µs
Tj initial=25 °C
2.5
1000
IGT Q3
ITSM
IGT Q1-Q2
2.0
100
1.5
I²t
1.0
VGT Q1-Q2-Q3
10
0.5
tP(ms)
1
0.01
0.10
1.00
T j(°C)
0.0
10.00
-50
-25
0
25
50
75
100
125
Figure 10. Relative variation of holding
Figure 11. Relative variation of critical rate of
current (IH) and latching current (IL)
decrease of main current (di/dt)c
vs. junction temperature
vs. (dV/dt)c
IH,IL[Tj]/IH, IL[Tj = 25 °C]
2.5
1.6
(di/dt)c[(dV/dt)c] / Specified(di/dt)c
1.4
2.0
1.2
ACST12-7Cxx
1.0
1.5
Typical values
0.8
1.0
ACST12-7Sxx
0.6
IL
0.5
0.4
IH
0.2
Tj (°C)
0.0
-50
4/12
-25
0
25
50
75
100
125
0.0
0.1
(dV/dt)c (V/µs)
1
10
100
ACST12
Characteristics
Figure 12. Relative variation of critical rate of
decrease of main current vs.
junction temperature
Figure 13. Relative variation of static dV/dt
immunity vs. junction temperature
(dI/dt)c[Tj] / (dI/dt)c[Tj=125°C]
11
12
10
11
9
10
dV/dt[Tj] / dV/dt[Tj=125°C]
VD=VR=400 V
9
8
8
7
7
6
6
5
5
4
4
3
3
2
2
1
1
Tj(°C)
Tj(°C)
0
0
25
50
75
100
125
Figure 14. Relative variation of maximum
clamping voltage, VCL vs. junction
temperature
1.15
25
50
75
100
125
Figure 15. Variation of thermal resistance
junction to ambient vs. copper
surface under tab
VCL[TJ/VCL[TJ = 25 °C]
Rth(j-a)(°C/W)
80
Epoxy printed circuit board
FR4, copper thickness = 35 µm
70
1.10
D²PAK
60
1.05
50
1.00
40
Minimum values
0.95
30
20
0.90
10
SCU(cm²)
TJ(°C)
0.85
0
-50
-25
0
25
50
75
100
125
0
5
10
15
20
5/12
Application information
ACST12
2
Application information
2.1
Typical application description
The ACST12 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
ACST12 switch is able to drive, with no turn off additional snubber, an inductive load up to
12 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 ACST12-7S can be driven directly by a MCU through a
simple gate resistor as shown in Figure 16.
Figure 16. Compressor control – typical diagram
Compressor
Compressor
AC Mains
AC Mains
2
PTC
Electronic
starter
1
logical circuitry
PTC
ACST
Start
switch
3
ACST
Run
switch
ACST
ACST
Electronic
thermostat
Rg
Power supply
6/12
Gate
Driver
Rg
Power supply
Gate
Driver
Rg
ACST12
Application information
Figure 17. Universal drum motor control – typical diagram
Universal motor
Stator
Rotor
12V
AC Mains
Motor direction
setting
MCU
Speed motor
regulation
ACST
Rg
Vcc
MCU
2.2
AC line transient voltage ruggedness
In comparison with standard TRIACs, which are not robust against surge voltage, the
ACST12 is self-protected against over-voltage, specified by the new parameter VCL. The
ACST12 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 18 represents the ACST12 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
ACST12 switches safely to the on state as shown in Figure 19. The ACST12 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.
7/12
Ordering information scheme
ACST12
Figure 18. Overvoltage ruggedness test circuit Figure 19. Typical current and voltage
for resistive and inductive loads for
waveforms across the ACST12
IEC 61000-4-5 standards
during IEC 61000-4-5 standard test
R = 5 Ω, L = 2 µH, Vsurge = 2 kV
Surge generator
VPEAK = V CL
2kV surge
VOUT
Rgene
Model of the load
Filtering unit
R
L
L
IOUT
ACST12
AC Mains
C
3
Rg
Ordering information scheme
Figure 20. Ordering information scheme
ACST 12 - 7 S G
AC switch series
On-state rms current
12 = 12 ARMS
Repetitive peak off-state voltage
7 = 700 V
Sensitivity
S = 10 mA
C = 35 mA
Package
G = D²PAK
T = TO-220AB
Packing
TR = Tape and reel
Blank : Tube
8/12
-TR
ACST12
4
Package information
Package information
●
Epoxy meets UL94, V0
●
Recommende torque: 0.4 to 0.6 N·m
In order to meet environmental requirements, ST offers these devices in ECOPACK®
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.
Dia
C
L5
L7
L6
L2
F2
D
L9
L4
Min.
Max.
Min.
Max.
A
4.40
4.60
0.173
0.181
C
1.23
1.32
0.048
0.051
D
2.40
2.72
0.094
0.107
E
0.49
0.70
0.019
0.027
F
0.61
0.88
0.024
0.034
F1
1.14
1.70
0.044
0.066
F2
1.14
1.70
0.044
0.066
G
4.95
5.15
0.194
0.202
G1
2.40
2.70
0.094
0.106
H2
10
10.40
0.393
0.409
L2
F
M
G1
Inches
A
H2
F1
Millimeters
16.4 typ.
0.645 typ.
L4
13
14
0.511
0.551
L5
2.65
2.95
0.104
0.116
L6
15.25
15.75
0.600
0.620
L7
6.20
6.60
0.244
0.259
L9
3.50
3.93
0.137
0.154
E
G
M
Diam.
2.6 typ.
3.75
3.85
0.102 typ.
0.147
0.151
9/12
Package information
Table 7.
ACST12
D2PAK dimensions
Dimensions
Ref.
Millimeters
Min.
A
E
C2
L2
D
L
L3
Typ.
Inches
Max.
Min.
Typ.
Max.
A
4.30
4.60
0.169
0.181
A1
2.49
2.69
0.098
0.106
A2
0.03
0.23
0.001
0.009
B
0.70
0.93
0.027
0.037
B2
1.25
C
0.45
0.60
0.017
0.024
C2
1.21
1.36
0.047
0.054
D
8.95
9.35
0.352
0.368
E
10.00
10.28 0.393
0.405
G
4.88
5.28
0.192
0.208
L
15.00
15.85 0.590
0.624
L2
1.27
1.40
0.050
0.055
L3
1.40
1.75
0.055
0.069
1.40
0.048 0.055
A1
B2
R
C
B
G
A2
2mm min.
FLAT ZONE
V2
R
V2
0.40
0°
8°
Figure 21. Footprint (dimensions in mm)
16.90
10.30
5.08
1.30
8.90
10/12
3.70
0.016
0°
8°
ACST12
5
Ordering information
Ordering information
Table 8.
Ordering information
Order code
Marking
ACST12-7CT
ACST12-7CG
Package
Weight
Base qty
Packing mode
TO-220AB
ACST127C
ACST12-7CG-TR
Tube
D PAK
1.5 g
50
Tube
D2
1.5 g
1000
Tape and reel
TO-220AB
ACST127S
ACST12-7SG-TR
6
50
PAK
ACST12-7ST
ACST12-7SG
2.3 g
2
2.3 g
50
Tube
D2
PAK
1.5 g
50
Tube
D2PAK
1.5 g
1000
Tape and reel
Revision history
Table 9.
Date
02-Dec-2008
Document revision history
Revision
1
Changes
First issue
11/12
ACST12
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12/12