UAA4713 View Datasheet(PDF) - STMicroelectronics
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UAA4713 Datasheet PDF : 14 Pages
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UAA4713
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
25°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.
(I2t) (Triac) > (I2t) (fuse)
To select the ITsm (given as a minimum value) the
following table is suggested.
Mains: VAC (V)
Power (W)
600
1000
>1000
240V
ITsm (min)
50
80
>100
110V
ITsm (min)
80
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
EUROPE
USA
Mains Voltage
(V) VAC
240
110
VDRM (V)
600
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)
9/14
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