SGS Thomson Microelectronics ACST8-8CFP Datasheet
®
ACST8-8C
ASD™
AC Switch Family
MAIN APPLICATIONS
AC static switching in appliance & industrial
■
control systems
Washing machine with bi-rotational induction
■
motor drive
Induction motor drive for:
■
- refrigerator / freezer compressor
- air conditioning compressor
FEATURES
V
■
DRM/VRRM
Avalanche controlled device
■
■ I
T(RMS)
High noise immunity: static dV/dt > 750 V/µs
■
Gate triggering current : IGT<30mA
■
■ Snubberless turn off commutation:
(dI/dt)c > 4.5A/ms
■ TO-220FPAB package
= +/- 800V
= 8A with T
CASE
=90°C
OVER VOLTAGE PROTECTED
AC POWER SWITCH
G
OUT
COM
TO-220FPAB
FUNCTIONAL DIAGRAM:
OUT
BENEFITS
■
Enables equipment to meet EN61000-4-5
standard
■
High off-state reliability with planar technology
■
Need no external overvoltage protection
■
Reduces the power component count
DESCRIPTION
The ACST8-8C 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 an induction motor
up to 8A.
This ACST 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 IEC61000-4-5 standards.
G
COM
January 2002 - Ed: 4B
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ACST8-8C
ABSOLUTE RATINGS (limiting values)
Symbol Parameter Value Unit
V
DRM /
V
RRM
I
T(RMS)
I
TSM
2
I
t Thermal constraint for fuse selection tp = 10ms 35 A2s
dI/dt Non repetitive on-state current critical rate of rise
V
PP
Tstg Storage temperature range - 40 to + 150 °C
Tj Operating junction temperature range - 40 to + 125 °C
Tl Maximum lead soldering temperature during 10s 260 °C
Note 1:accordingto test described by IEC61000-4-5 standard & Figure A.
GATE CHARACTERISTICS (maximum values)
Symbol Parameter Value Unit
P
G (AV)
P
GM
I
GM
Repetitive peak off-state voltage 800 V
RMS on-state current full cycle sine wave 50 to 60 Hz Tcase = 90°C 8 A
Non repetitive surge peak on-state current
Tj initial = 25°C, full cycle sine wave
tp = 20ms 80 A
tp = 16.7ms 85 A
Rate period > 1mn 100 A/µs
I
= 10mA (tr < 100ns)
G
Non repetitive line peak pulse voltage
note 1
2kV
Average gate power dissipation 0.1 W
Peak gate power dissipation (tp = 20µs) 10 W
Peak gate current (tp = 20µs) 1 A
THERMAL RESISTANCE
Symbol Parameter Value Unit
Rth (j-a) Junction to ambient 60 °C/W
Rth (j-c) Junction to case for full cycle sine wave conduction 3.5 °C/W
PARAMETER DESCRIPTION
Parameter Symbol Parameter description
I
GT
V
GT
V
GD
I
H
I
L
V
TM
V
TO
R
D
I
DRM/IRRM
dV/dt Static pin OUT voltage rise
Gate triggering current
Gate triggering voltage
Non triggering voltage
Holding current
Latching current
On state voltage
On state characteristic threshold voltage
On state characteristic dynamic resistance
Forward or reverse leakage current
(dI/dt)c Turn off current rate of decay
V
CL
Avalanche voltage at turn off
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ACST8-8C
ELECTRICAL CHARACTERISTICS PER SWITCH
For either positive or negative polary of pin OUT voltage respect to pin COM voltage
Symbol Test conditions Values Unit
I
V
V
V
V
R
I
DRM
I
RRM
GT
GT
GD
I
H
I
L
TM
TO
D
V
= 12V (DC) RL=33Ω Tj = 25°C MAX. 30 mA
OUT
V
= 12V (DC) RL=33Ω Tj = 25°C MAX. 1.5 V
OUT
V
OUT=VDRM
I
= 100mA Gate open Tj = 25°C MAX. 40 mA
OUT
RL= 3.3kΩ Tj =125°C MIN. 0.2 V
IG= 20mA Tj = 25°C MAX. 70 mA
I
= 11A tp = 380µs Tj = 25°C MAX. 1.5 V
OUT
Tj = 125°C MAX. 0.95 V
Tj = 125°C MAX. 50 mΩ
V
OUT=VDRM
V
OUT=VRRM
Tj = 25°C MAX. 10 µA
Tj = 125°C MAX. 1 mA
dV/dt V
= 550V gate open Tj = 125°C MIN. 750 V/µs
OUT
(dI/dt)c Withoutsnubber Tj = 125°C MIN. 4.5 A/ms
V
CL
ICL= 1mA tp = 1ms Tj = 25°C TYP. 1200 V
AC LINE SWITCH BASIC APPLICATION
The ACST8-8C device is especially designed to drive medium power induction motors in washing machines, refrigerators, dish washers, and tumble dryers.
Pin COM : Common drive reference, to be connected to the power line neutral
Pin G :Switch Gate input to be connected to the controller
Pin OUT : Switch Output to be connected to the load
When driven from a low voltage controller, the ACST switch is triggered with a negative gate current flowing out of the gate pin G. It can be driven by the controller through a resistor as shown on the typical application diagram. In appliance systems, the ACST8-8C switch intends to drive medium power load in ON /
OFF full cycle or phase angle control mode.
Thanks to its thermal and turn-off commutation characteristics, the ACST8-8C switch is able to drive
an inductive load up to 8A without a turn-off aid snubber circuit.
In washing machine or drier appliances, the tumble rotates in both directions. When using bidirectional
phase shift induction motor, two switches are connected on each side of the phase shift capacitor: in
steady-state operation, one switch only conducts energising the coils and defining the tumble direction.
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