AN1296 Datasheet, PDF (1/8 Pages) STMicroelectronics – Ring wave tests with ACS108 driving valves and pumps

AN1296
Application note
Ring wave tests with ACS108 driving valves and pumps
Introduction
In this application note, test results obtained using ACS108 AC switch devices are
presented in order to analyze their behavior when subjected to standard ring wave surges.
The behavior of these devices subjected to a 1.2/50 µs impulse wave is specified in the
datasheets.
The test procedure is described in the UL858A standard. The only difference with the tests
below is that the normalized waveform is applied directly to the semiconductor and the load
(refer to Figure 1).
No coupling network is used to apply the surges while the system is connected to the mains
terminals. The only stress is due to the breakover turn-on current. The current conduction
during half mains cycle is not an issue.
The ACSs are not triggered by their gate - they turn on by over voltage when the generator
voltage exceeds their clamping level. The surge is then applied across the load and the load
current flows through the ACS™ which is in the on state.
Figure 1. Test diagram
IOUT
Load
AC power
switch
Integrated
driver
G
OUT
Over voltage
protection
( Trisil™-like)
Ringwave
generator
COM
RG = 150W
TM: Trisil is a trademark of STMicroelectronics
All the following oscillograms have been produced using the equipment listed below:
● Tektronix TDS754A scope
● Tektronix voltage P6013A probe (1/1000 ratio)
● Eurocraft pulse current transformer (1 V /10 A ratio)Tektronix TCP202 current probe
TM: ACS is a trademark of STMicroelectronics
June 2010
Doc ID 8159 Rev 3
1/8
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