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ACS108-6SA-AP

P1-P3P4-P6P7-P9P10-P12P13-P13
Characteristics ACS108
4/13 DocID6518 Rev 5
Figure 4. On-state rms current versus ambient
temperature (free air convection)
Figure 5. Relative variation of thermal
impedance junction to ambient versus pulse
duration
I (A)
T(RMS)
0.0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
0 25 50 75 100 125
Single layer Printed
circuit board FR4
Natural convection
TO-92
SOT-223
a =180
°
T
a
°C
K=[Z
th(j-a)
/R
th(j-a)
]
0.01
0.10
1.00
1.0E-03 1.0E-02 1.0E-01 1.0E+00 1.0E+01 1.0E+02 1.0E+03
Z
th(j-a)
SOT-223
Copper surface
area = 5cm²
TO-92
SOT-223
t (s)
P
Figure 6. Relative variation of holding and
latching current versus junction temperature
Figure 7. Relative variation of I
GT
and V
GT
versus junction temperature
I
GT
,V
GT
[T
j
]/I
GT
,V
GT
,[T
j
=25 °C]
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
-50 -25 0 25 50 75 100 125
I
GT
Q2
V
GT
Q2-Q3
I
GT
Q3
T
j
(°C)
Figure 8. Surge peak on-state current versus
number of cycles
Figure 9. Non repetitive surge peak on-state
current for a sinusoidal pulse, and
corresponding value of I²t
I
TSM
(A)
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
1 10 100 1000
Non repetitive
T
j
initial=25 °C
TO-92
Repetitive
T
lead
= 76
°
C
SOT-223
Repetitive
T
tab
= 104°C
One cycle
t=20ms
Number of cycles
I
TSM
(A), I²t (A²s)
1.E-01
1.E+00
1.E+01
1.E+02
1.E+03
0.01 0.10 1.00 10.00
I
TSM
I²t
Sinusoidal pulse,
t
p
< 10 ms
T
j
initial = 25 °C
(ms)t
p
DocID6518 Rev 5 5/13
ACS108 Characteristics
13
Figure 10. On-state characteristics (maximum
values)
Figure 11. Relative variation of critical rate of
decrease of main current versus junction
temperature
I
TM
(A)
0.10
1.00
10.00
100.00
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5
T
j
max.:
V
to
= 0.85 V
R
d
= 300 m
Ω
Tj=25 °C
Tj=125 °C
V
TM
(V)
(dI/dt) [T ] / (dI/dt) [T =125 °C]
cc
jj
0.0
0.5
1.0
1.5
2.0
2.5
25 35 45 55 65 75 85 95 105 115 125
T (°C)
j
Figure 12. Relative variation of static dV/dt
immunity versus junction temperature
(1)
Figure 13. Relative variation of leakage current
versus junction temperature
1. V
D
= V
R
= 402 V: Typical values above 5 kV/µs. Beyond equipment capability
dV/dt [T
j
]/dV/dt[T
j
=125°C]
0
1
2
3
4
5
25 50 75 100 125
V
D
=V
R
=536V
T
j
(°C)
1.0E-03
1.0E-02
1.0E-01
1.0E+00
25 50 75 100 125
I
DRM
/I
RRM
[Tj;V
DRM/
V
RRM
]/I
DRM
/I
RRM
[Tj=125°C;800 V]
V
DRM
=V
RRM
=600 V
V
DRM
=V
RRM
=800 V
T
j
(°C)
Figure 14. Relative variation of critical rate of
decrease of main current (di/dt)c versus
(dV/dt)c
Figure 15. Thermal resistance junction to
ambient versus copper surface under tab
(SOT-223)
(dI/dt)
c
[(dV/dt)
c
] / Specified (dI/dt)
c
0.0
0.5
1.0
1.5
2.0
2.5
3.0
3.5
4.0
4.5
5.0
0.1 1.0 10.0 100.0
Tj =125 °C
(dV/dt)
c
(V/µs)
R
th(j-a)
(°C/W)
0
20
40
60
80
100
120
140
0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
SOT-223
S
CU
(cm²)
Printed circuit board FR4
copper thickness = 35 µm
Alternating current mains switch - basic application ACS108
6/13 DocID6518 Rev 5
2 Alternating current mains switch - basic application
The ACS108 switch is triggered by a negative gate current flowing from the gate pin G. The
switch can be driven directly by the digital controller through a resistor as shown in
Figure 16.
Thanks to its overvoltage protection and turn-off commutation performance, the ACS108
switch can drive a small power high inductive load with neither varistor nor additional turn-off
snubber.
Figure 16. Typical application schematic
2.1 Protection against overvoltage: the best choice is ACS
In comparison with standard Triacs the ACS108 is over-voltage self-protected, as specified
by the new parameter V
CL
. This feature is useful in two operating conditions: in case of turn-
off of very inductive load, and in case of surge voltage that can occur on the electrical
network.
2.1.1 High inductive load switch-off: turn-off overvoltage clamping
With high inductive and low rms current loads the rate of decrease of the current is very low.
An overvoltage can occur when the gate current is removed and the OUT current is lower
than I
H
.
As shown in Figure 17, at the end of the last conduction half-cycle, the load current
decreases
① . The load current reaches the holding current level I
H
② , and the ACS turns
off
③ . The water valve, as an inductive load (up to 15 H), reacts as a current generator and
an overvoltage is created, which is clamped by the ACS
④ . The current flows through the
ACS avalanche and decreases linearly to zero. During this time, the voltage across the
switch is limited to the clamping voltage V
CL
. The energy stored in the inductance of the
load is dissipated in the clamping section that is designed for this purpose. When the energy
has been dissipated, the ACS voltage falls back to the mains voltage value (230 V rms,
50 Hz)
⑤ .
AC Mains
ACS108
Valve
Power supply
MCU
V
dd
V
ss
Rg
220 Ω
I
T
V
T
P1-P3P4-P6P7-P9P10-P12P13-P13

ACS108-6SA-AP

Mfr. #:
Buy ACS108-6SA-AP
Manufacturer:
STMicroelectronics
Description:
Triacs Transient Vltg Protected AC Switch
Lifecycle:
New from this manufacturer.
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