ACS102-5Tx

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ACS™ switch turns off. Because of the inductance L of the load, the current flows through the avalanche

diode D and decreases linearly to zero. During this time, the voltage across the switch is limited to the

to 10 H); it can reach about 20 mJ and is dissipated in the clamping diode section. The ACS™ switch sus-

tains the turn off energy, because its clamping section is designed for that purpose.

HIGH INDUCTIVE SWITCH-OFF OPERATION

T

ime (400µs/div)

(10 mA/div)

(200V/div)

Fig. 1: Turn-off operation of the ACS102 switch

with an electro valve: waveform of the gate current

Fig. 2: ACS102 switch static characteristic.

The ACS102 switch is able to withstand safely the AC line transient voltages either by clamping the low en-

ergy spikes or by breaking over under high energy shocks.

The test circuit of the figure 3 is representative of the final ACS™ application and is also used to stress the

ACS™ switch according to the IEC61000-4-5 standard conditions. Thanks to the load, the ACS™ switch

withstands the voltage spikes up to 2 kV above the peak line voltage. It will break over safely even on resis-

tive load where the turn on current rate of increase is high as shown on figure 4. Such non repetitive test

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

AC LINE TRANSIENT VOLTAGE RUGGEDNESS

RL

Ω

AC LINE &

SURGE VOLTAGE

GENERATOR

G

COM

OUT

ACSxx

ON

S

D

Fig. 3: Overvoltage ruggedness test circuit for

resistive and inductive loads according to

IEC61000-4-5 standard.

R = 150

Vout (200 V/div)

Iout (2.5 A/div)

dI/dt = 70 A/µs

Fig. 4: Current and Voltage of the ACS™ during

IEC61000-4-5 standard test withR=150

Ω,L=5µH