ACS102 데이터 시트보기 (PDF) - STMicroelectronics

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ACS102

ASD™ AC Switch Family

STMicroelectronics 

ACS102-5Tx

HIGH INDUCTIVE SWITCH-OFF OPERATION

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.

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.

Fig. 2: ACS102 switch static characteristic.

IOUT

(10 mA/div)

IH

VOUT

(200V/div)

VCL = 650V

IOUT

IH

VCL

VOUT

Time (400µs/div)

AC LINE TRANSIENT VOLTAGE RUGGEDNESS

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.

Fig. 3: Overvoltage ruggedness test circuit for

resistive and inductive loads according to

IEC61000-4-5 standard.

R = 150Ω, L = 5µH, VPP = 2kV.

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

IEC61000-4-5 standard test with R = 150Ω, L = 5µH

& VPP = 2kV.

AC LINE &

SURGE VOLTAGE

GENERATOR

R

L

VAC + VPP

S

D

OUT

ACSxx

ON

COM

G

RG= 220Ω

Vout (200 V/div)

Iout (2.5 A/div)

dI/dt = 70 A/µs

4/8

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