ST AVS12 User Manual

®	AVS12

AUTOMATIC VOLTAGE SWITCH (SMPS < 500W)

CONTROLLER

■50/60Hz FULL COMPATIBILITY

■INTEGRATED VOLTAGE REGULATOR

■TRIGGERING PULSE TRAIN OF THE TRIAC

■PARASITIC FILTER

■LOW POWER CONSUMPTION

TRIAC

■HIGH EFFICIENCY AND SAFETY SWITCHING

■UNINSULATED PACKAGE : AVS12CB

■VDRM = ± 600 V

■IT(RMS) : 12A

DESCRIPTION

The AVS12 kit is an automatic mains selector (110/220V AC) to be used in SMPS < 500 W. It is composed of 2 devices :

■The Controller is optimized for low consumption and high security triggering of the

triac. When connected to VSS, the mode input activates an additional option. If the main power drops from 220V to 110V, the triac control remains locked to the 220V mode and avoids any high voltage spike when the voltage is restored to 220V.

When connected to VDD, the mode input desactivates this option.

■The TRIAC is specially designed for this application. An optimization between sensitivity and dynamic parameters of the triac gate highly reduces the losses of supply resistor and allows excellent immunity against disturbances.

A2

G

A1A2

AVS1ACP08	AVS12CB
DIP-8	TO-220AB

PIN CONNECTION

VSS
		1	8		VM
Osc / In		2	7		Mode
Osc / Out		3	6		N.C.
VDD		4	5		VG

January 2002 - Ed: 3C

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AVS12

BLOCK DIAGRAM

AVS1ACP08	MODE

Supply

Peak Voltage

Detector

				AVS12CB
	Reset			A2
			Mains
	Parasitic		mode
		CP	Controller	Q
	Filter

Zero Crossing
Detector	S
		Triggering
			Q
	CP	Time
OSC/IN		Controller	A1
Oscillator
OSC/OUT

ABSOLUTE MAXIMUM RATINGS

CONTROLLER AVS1ACP08

Symbol	Parameter	Value			Unit
		Min.		Max.
VSS	Supply voltage	-12		0.5	V
VI / VO	I / O voltage	VSS -0.5		0.5	V
II / IO	I / O current	-40		+40	mA
Tstg	Storage Temperature	-60		+150	°C
Toper	Operating Temperature code ''C''	0		+70	°C

TRIAC AVS12CB Tj = +25°C (unless otherwise specified)

Symbol		Parameter		Value	Unit
VDRM	Repetitive peak off-state voltage (2)			± 600	V
IT(RMS)	RMS on-state current (360° conduction angle)		T C = 70°C	12	A
ITSM	Non repetitive surge peak on-state current ( Tj initial = 25°C )		t = 8.3ms	105	A
			t = 10ms	100
I2t	I2t value		t = 10ms	50	A2s
dI / dt	Critical rate of rise of on-state current (1)		Repetitive	20	A/µs
			F = 50Hz
			Non	100
			Repetitive
dV/dt *	Linear slope up to 0.67 VDRM	Gate open	Tj = 110°C	50	V/µs
Tstg	Storage Temperature			- 40 + 150	°C
Tj	Junction Temperature Range			0 + 125
(1) Gate supply : IG = 100mA – di/dt = 1A/μs		* For either polarity of electrode A2 voltage with reference to electrode A1
(2) Tj = 110°C
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								AVS12
THERMAL RESISTANCE
TRIAC AVS12CB
Symbol		Parameter				Value		Unit
Rth (j-a)	Junction to ambient					60		°C/W
Rth (j-c) DC	Junction to case for DC					3		°C/W
Rth (j-c) AC	Junction to case for 360° conduction angle (F = 50Hz)					2.3		°C/W
DC GENERAL ELECTRICAL CHARACTERISTICS
TRIAC AVS12CB
Symbol		Parameter				Value		Unit
					Min.		Max.
VGD	VD = VDRM	RL = 3.3kΩ Pulse duration > 20µs	Tj = 110°C		0.2			V
VTM *	ITM = 17A	tp = 10ms	Tj = 25°C				1.75	V
IDRM *	VDRM rated	Gate open	Tj = 25°C				10	μA
			Tj = 110°C				500
* For either polarity of electrode A2 voltage with reference to electrode A1

Fig. 1: Maximum RMS power dissipation versus RMS on-state current (F = 60Hz). (Curves are cut off by (dI/dt)c limitation)

Fig. 2: Correlation between maximum mean power dissipation and maximum allowable temperature (Tamb and Tcase) for different thermal resistances heatsink + contact.

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