AN1296

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Doc ID 8159 Rev 3

5/8

1.3

Resistor rated at 5 W, 150

Ω

In order to check the good behavior of ACSs during a ring wave test, whatever the load is,

we have performed trials with a 150 Ohm resistor. This value is equivalent to the resistor of

a 120 V-10 W light bulb at cold state. The chosen resistors present a serial inductance lower

than 3.5 µH. So, as the device turns on in breakover mode, the current rate of increase is not

limited by the load. This case seems to be the worst one that can appear in practice for

ACS108 products (no inductive and low resistive load).

Figure 5 shows an oscillogram for a 6 kV surge. The current reaches up to 57 A, with a

130 A/µs slope. Sixty positive surges and sixty negative surges have been applied, as

required in the UL858A standard. Tested devices did not present variation of any

parameters after the trials.

Figure 5.

6 kV ring wave test with a 5 W, 150

Ω resistor

Vout (200 V/div)

Iout (12.5 A/div)