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ACS102-5TX Datasheet(PDF) 4 Page - STMicroelectronics |
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ACS102-5TX Datasheet(HTML) 4 Page - STMicroelectronics |
4 / 8 page ACS102-5Tx 4/8 At the end of the last conduction half-cycle, the load current reaches the holding current level IH, and the 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 clamping voltage VCL. The energy stored in the inductance of the load depends on the holding current IH and the inductance (up 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) IOUT (10 mA/div) VOUT (200V/div) IH VCL = 650V Fig. 1: Turn-off operation of the ACS102 switch with an electro valve: waveform of the gate current IG, pin OUT current IOUT & voltage VOUT. IH VCL IOUT VOUT 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 RG= 220 Ω VAC +VPP 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 Ω,L=5µH, VPP = 2kV. 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 &VPP = 2kV. |
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