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參數(shù)資料
| 型號： | Z0109MA |
| 廠商： | NXP Semiconductors N.V. |
| 元件分類： | 參考電壓二極管 |
| 英文描述： | 4Q Triac |
| 中文描述： | 4Q雙向可控硅 |
| 封裝： | Z0109MA<SOT54 (TO-92)|<<http://www.nxp.com/packages/SOT54.html<1<week 5, 2005,; |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 239K |
| 代理商： | Z0109MA |
Philips Semiconductors
AN10384
Triac power and thermal calculations
4.3 Top-loading (Vertical Axis) washing machine
The machine uses a reversing induction motor that’s controlled by two triacs. Will the
triacs’ T
j
max of 125
°
C be exceeded if they are operated without a heatsink
Application information:
Full load motor power = 300 W.
Mains supply = 230 V RMS.
A
V
P
I
RMS
T
3
=
230
300
)
(
=
=
∴
Isolated triac package is required.
Maximum ambient temperature is 40
°
C.
Calculations:
This application requires 1000 V triacs to withstand the high AC mains voltage that the
motor imposes across them. A three-quadrant design is mandatory for maximum
immunity to false triggering. The BTA208X-1000C or BTA208B-1000C is recommended.
These are 8 A, 1000 V, Hi-Com triacs with I
GT
of 35 mA. They use the SOT186A all-
plastic insulated package and SOT404 (D
2
PAK) surface mount package respectively.
Using equation 2,
A
I
I
RMS
T
AVE
T
17
.
3
×
π
2
2
2
2
)
(
)
(
=
×
=
×
π
×
=
From the data sheet, V
o
= 1.216 V and R
s
= 0.0416
Ω
.
Using equation 1,
W
I
R
I
V
P
RMS
T
s
AVE
T
o
49
.
3
×
0416
.
17
.
×
216
.
2
2
)
(
)
(
=
+
=
×
+
×
=
Using equation 6,
a
thj
a
j
R
P
T
T
×
+
=
We already know that T
a
= 40
°
C and P = 1.49 W.
From the data sheet, R
th j-a
for the SOT186A package in free air is 55
°
C/W.
C
T
j
°
=
×
+
=
∴
122
55
49
.
40
This is below the T
j
max of 125
°
C. Therefore the triacs can be operated without
heatsinks.
Koninklijke Philips Electronics N.V. 2005. All rights reserved.
Application note
Rev. 01 — 10 August 2005
12 of 16
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