UAA4713DP datasheet(9/14 Pages) STMICROELECTRONICS

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APPLICATION INFORMATION

1. HOW TO CHOOSE THE TRIAC ASSOCIATED

TO THE MOTION DETECTOR UAA4713

Analysis of the Triac Associated to the Motion

Detector UAA4713

Associated with the UAA4713, the Triac is de-

fined by the driver output stage (Triac output pin

5) and the characteristics of the load.

The Triac is consequently defined by:

1) The gate sensitivity

2) The surge current capability

3) The RMS Triac current

4) The blocking voltage capability

1) The gate sensitivity

The ”Triggering gate current” is the parameter to

be taken into consideration. The IGT is given at

°C. as a maximum value required to trigger the

Triac.

ex. BTA06-600CW = IGT max (mA) = 35mA

The UAA4713 Triac output provides a current of

65mA typical.

ITout = 65mA(Typ) = IG

In order to control the Triac properly IG should be

greater than 1.5 x IGT or

ITout > 1.5 IGT

For this reason it is suggested to use a snubber-

less Triac of the CW series (IGT < 35mA).

2) The surge current capability

In the Triac databook the surge current capability

of the Triac is given by the non repetitive surge

peak current:

ITSM

ex. BTA06-600CW

ITSM at TJ initial =25

°C

t = 8.3mA: 63A

t = 10ms: 60A

The choice of the Triac is defined by the following

application parameters:

a)The starting performance, and the ratio of

the nominal resistance to the cold resis-

tance, KR

Imax >KR x Inominal x

√2

b)The thermal fast fuse behaviour during

short-circuit condition.

2t) (Triac) > (I2t) (fuse)

To select the ITsm (given as a minimum value) the

following table is suggested.

Mains: VAC (V)

240V

110V

Power (W)

600

1000

>1000

ITsm (min)

>100

ITsm (min)

120

>150

3) RMS Triac Current

The RMS Triac current ITRMS is defined by the

light power P:

ITRMS >1. 25 x P x VAC

It depends also on the heat sink which has to limit

the junction temperature in the worse case condi-

tions (Tamb max and ITRMS).

With the snubberless triac ITRMS ranges from 6A

to 25A.

4) Blocking Voltage Capability

The maximum blocking voltage VDRM is defined

by the mains:

Country

Mains Voltage

(V) VAC

VDRM (V)

EUROPE

240

600

USA

110

400

5) Conclusion:

Selector guide with the above parameters the op-

timal device selection for a given power to be

controlled is given in the following table:

LIGHT POWER

(W)

MAINS VOLTAGE VAC (V)

240

110

600

BTA 06 600 CW

BTA 08 400 CW

1,000

BTA 08 600 CW

BTA 12 400 CW

> 1,000

BTA X 600 CW

X= 10

X= 12

X= 16

BTA X 400 CW

X= 12

X = 16 (A)

Ref: High Performance Triacs that need no snub-

ber (DSTRIACBK/1088)

UAA4713

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