ACST8

5/10

3. AC LINE TRANSIENT VOLTAGE RUGGEDNESS

The ACST8-8C switch is able to safely withstand the AC line transient voltages either by clamping the low

energy spikes or by breaking over under high energy shocks.

The test circuit in figure 3 is representative of the ACST application and is used to test the ACST switch

according to the IEC61000-4-5 standard conditions. Thanks to the load impedance, the ACST switch with-

stands voltage spikes up to 2 kV above the peak line voltage by breaking over safely. Such non repetitive

testing can be done 10 times on each AC line voltage polarity.

Figure 3: Overvoltage ruggedness test circuit for resistive and inductive loads according to

IEC61000-4-5 standard R = 47

Figure 4: Maximum power dissipation versus

RMS on-state current

Figure 5: RMS on-state current versus case

temperature

Figure 6: RMS on-state current versus ambient

temperature

Figure

7:

Relative

variation

of

thermal

impedance versus pulse duration (TO-220FPAB)

L

R

SURGE VOLTAGE

AC LINE & GENERATOR

G

COM

OUT

0

1

2

3

4

5

6

7

8

9

10

11

01234

5678

α=180°

180°

α

α

P(W)

I

(A)

T(RMS)

0

1

2

3

4

5

6

7

8

9

0

25

50

75

100

125

α=180°

TO-220AB/D PAK

2

TO-220FPAB

I

(A)

T(RMS)

T (°C)

C

0.0

0.5

1.0

1.5

2.0

2.5

3.0

0

25

50

75

100

125

α=180°

Printed circuit board FR4

Natural convection

D PAK

2

TO-220FPAB/TO-220AB

I

(A)

T(RMS)

T

(°C)

amb

1.E-03

1.E-02

1.E-01

1.E+00

1.E-03

1.E-02

1.E-01

1.E+00

1.E+01

1.E+02

1.E+03

TO-220FPAB

K=[Z /R ]

th

th

t (°C)

p