ST ACST8 User Manual

ACST8

Overvoltage protected AC switch

Features

■Triac with overvoltage protection

■High noise immunity: static dV/dt > 2000 V/µs

■TO-220FPAB insulated package: 1500 V rms

Benefits

■Enables equipment to meet IEC 61000-4-5

■High off-state reliability with planar technology

■Needs no external overvoltage protection

■Reduces the power passive component count

■High immunity against fast transients described in IEC 61000-4-4 standards

Applications

■AC mains static switching in appliance and industrial control systems

■Drive of medium power AC loads such as:

–Universal motor of washing machine drum

–Compressor for fridge or air conditioner

Description

The ACST8 series belongs to the ACS™/ ACST power switch family built around A.S.D.® (application specific discrete) technology. This high performance device is suited to home appliances or industrial systems and drives an induction motor up to 8 A.

This ACST8 device embeds a Triac structure with a high voltage clamping device to absorb the inductive turn off energy and withstand line transients such as those described in the

IEC 61000-4-5 standards.

ACST8 shows a high noise immunity complying with IEC standards such as IEC 61000-4-4 (fast transient burst test).

	OUT
	G	G
	OUT	OUT
	COM
		COM
	TO-220AB	TO-220FPAB
	ACST830-8T	ACST830-8FP
	OUT
		G
	COM
	D2PAK
	ACST830-8G

Figure 1. Functional diagram

OUT

G

COM

Table 1.	Device summary
Symbol		Value	Unit
IT(RMS)		8	A
VDRM/VRRM		800	V
IGT		30	mA

TM: ACS is a trademark of STMicroelectronics. ®: A.S.D. is a registered trademark of STMicroelectronics

February 2011

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	Characteristics					ACST8
	1	Characteristics
	Table 2.	Absolute ratings (limiting values)
	Symbol	Parameter			Value	Unit
			TO-220FPAB	Tcase = 91 °C
			TO-220AB /	Tcase = 105 °C	8	A
	IT(RMS)	On-state rms current (full sine wave)	2
			D PAK
			D2PAK with	Tamb = 43 °C	2	A
			1 cm2 Cu
	ITSM	Non repetitive surge peak on-state current	F = 50 Hz	tp = 20 ms	80	A
		Tj initial = 25 °C, full cycle sine wave	F = 60 Hz	tp = 16.7 ms	84	A
	I2t	Thermal constraint for fuse selection		t = 10 ms	42	A2s
				p
	dI/dt	Critical rate of rise on-state current	F = 120 Hz	Tj = 125 °C	100	A/µs
		IG = 2 x IGT, (tr ≤ 100 ns)
	(1)	Non repetitive line peak pulse voltage		Tj = 25 °C	2	kV
	VPP
	PG(AV)	Average gate power dissipation		Tj = 125 °C	0.1	W
	PGM	Peak gate power dissipation (tp = 20 ms)		Tj = 125 °C	10	W
	IGM	Peak gate current (tp = 20 ms)		Tj = 125 °C	1.6	A
	Tstg	Storage temperature range			- 40 to + 150	°C
	Tj	Operating junction temperature range			- 40 to + 125	°C
	Tl	Maximum lead soldering temperature during 10 s			260	°C
	VINS(RMS)	Insulation rms voltage	TO-220FPAB		1500	V

1. According to test described in IEC 61000-4-5 standard and Figure 18.

Table 3.		Electrical characteristics per switch
Symbol		Test conditions	Quadrant	Tj		Value	Unit
IGT(1)		VOUT = 12 V, RL = 33 Ω	I - II - III	25 °C	Max	30	mA
VGT		VOUT = 12V, RL = 33 Ω	I - II - III	25 °C	Max	1.0	V
VGD		VOUT = VDRM, RL = 3.3 kΩ	I - II - III	125 °C	Min	0.2	V
I	(2)	I = 500 mA		25 °C	Max	30	mA
	H	OUT
	IL	IG = 1.2 x IGT	I - II - III	25 °C	Max	50	mA
dV/dt(2)		VOUT = 67% VDRM, gate open		125 °C	Min	2000	V/µs
(dI/dt)c(2)		Without snubber		125 °C	Min	8	A/ms
VCL		ICL = 0.1 mA, tp = 1 ms		25 °C	Min	850	V

1.Minimum IGT is guaranteed at 5% of IGT(Max)

2.For either positive or negative polarity of OUT pin with reference to COM pin

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ACST8								Characteristics
Table 4.		Static characteristics
Symbol		Test conditions						Value	Unit
VTM		ITM = 11.3 A tp = 500 µs		Tj = 25 °C			Max	1.5	V
VTO		Threshold voltage		Tj = 125 °C			Max	0.9	V
RD		Dynamic resistance		Tj = 125 °C			Max	50	mΩ
IDRM		VOUT = VDRM / VRRM		Tj = 25 °C			Max	20	µA
IRRM				Tj = 125 °C				1	mA
Table 5.		Thermal resistances
Symbol		Parameter						Value	Unit
		Junction to ambient			TO-220FPAB			60
Rth(j-a)					TO-220AB
		Junction to ambient (soldered on 1 cm2 copper pad)			D2PAK			45	°C/W
Rth(j-c)		Junction to case (AC)			TO-220FPAB			3.6
					TO-220AB, D2PAK			2
Figure 2.		Maximum power dissipation versus Figure 3.			On-state rms current versus case
		on-state rms current			temperature (full cycle)

	P(W)									IT(RMS)(A)
	10
										9
	α=180 °										α=180°
															TO-220AB
	9									8
															D2PACK
	8									7			TO-220FPAB
	7									6
	6									5
	5									4
	4
	3									3
	2							180°		2
	1				IT(RMS)(A)					1			TC(°C)
	0									0
										0	25	50	75	100	125
	0	1	2	3	4	5	6	7	8

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Characteristics	ACST8

Figure 4. On-state rms current versus ambient temperature

(free air convection, fulle cycle)

Figure 5. Relative variation of thermal impedance versus pulse duration

IT(RMS)(A)

K=[Zth/Rth]

3.0

1.0E+00

TO-220AB

Zth(j-c)

α=180°

2.5

D2PAK

Zth(j-a)

Copper surface

= 1cm2

TO-220FPAB

2.0

TO-220

1.5

1.0E-01

1.0

TO-220AB

0.5

TO-220FPAB

Tamb(°C)

tp(s)

0.0

1.0E-02

0

25

50

75

100

125

1.0E-03

1.0E-02

1.0E-01

1.0E+00

1.0E+01

1.0E+02

1.0E+03

Figure 6. Relative variation of gate trigger	Figure 7. Relative variation of holding
current (IGT) and voltage (VGT)	current (IH) and latching current (IL)
versus junction temperature	versus junction temperature

I	, V	[T	] / I	GT	, V	GT	[T	=25 °C]					I	, I	L	[T	] / I	,	I	[T	=25 °C]
GT	GT	j					j						H			j		H	L	j
3.0													2.5
			IGT Q3
2.5										Typical values
													2.0
					IGT Q1-Q2
2.0
													1.5
1.5
													1.0
1.0	VGT Q1-Q2-Q3																								IL
0.5													0.5
																									IH
									Tj(°C)														Tj(°C)
0.0													0.0
-50		-25					0	25	50	75	100	125	-50				-25				0	25	50	75	100	125

Figure 8. Surge peak on-state current versus Figure 9. number of cycles

Non repetitive surge peak on-state current and corresponding value of I2t versus sinusoidal pulse width

I	(A)				I		(A), I²t (A²s)
TSM					TSM
90					1000
80								Tj	initial=25 °C
70				t=20ms		dI/dt limitation: 100 A/µs			ITSM
60		Non repetitive		One cycle	100
		Tj	initial=25 °C
50
40								I²t
30	Repetitive				10
20	TC=105 °C
10							sinusoidal pulse	tP(ms)
			Number of cycles				with width tP < 10 ms
0					1
1		10	100	1000	0.01		0.10	1.00	10.00

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