ACST10 查看數據表（PDF） - STMicroelectronics

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ACST10

Transient protected AC power switch

STMicroelectronics 

Ordering information scheme

ACST10

2.2

AC line transient voltage ruggedness

In comparison with standard TRIACs, which are not robust against surge voltage, the

ACST10 is self-protected against over-voltage, specified by the new parameter VCL. The

ACST10 switch can safely withstand AC line transient voltages either by clamping the low

energy spikes or by switching to the on state (for less than 10 ms) to dissipate higher energy

shocks through the load. This safety feature works even with high turn-on current rises.

The test circuit of Figure 17 represents the ACST10 application, and is used to stress the

ACST switch according to the IEC 61000-4-5 standard conditions. Thanks to the load which

is limiting the current, the ACST switch withstands the voltage spikes up to 2 kV above the

peak line voltage. The protection is based on an overvoltage crowbar technology. The

ACST10 switches safely to the on state as shown in Figure 18. The ACST10 recovers its

blocking voltage capability after the surge. Such a non repetitive test can be done at least 10

times on each AC line voltage polarity.

Figure 17. Overvoltage ruggedness test circuit Figure 18. Typical current and voltage

for resistive and inductive loads for

waveforms across the ACST10

IEC 61000-4-5 standards

during IEC 61000-4-5 standard test

R = 8 Ω, L = 4 µH, Vsurge = 2 kV

Surge generator

2kV surge

VOUT

VPEAK = V CL

Filtering unit

Rgene

Model of the load

R

L

IOUT

L

AC Mains

C

ACST12

Rg

3

Ordering information scheme

Figure 19. Ordering information scheme

AC Switch

On-state rms current

10 = 10A

Repetitive peak off-state voltage

7 = 700V

Triggering gate current

S = 10 mA

C = 35 mA

Package

FP = TO-220FPAB

T = TO-220AB

ACST 10 - 7 C T

8/12

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