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參數(shù)資料
| 型號(hào)： | BT136S-800G |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 晶閘管 |
| 英文描述： | RECTIFIER SCHOTTKY SINGLE 0.5A 20V 5.5A-Ifsm 0.385Vf 0.25A-IR SOD-123 3K/REEL |
| 中文描述： | 800 V, 4 A, 4 QUADRANT LOGIC LEVEL TRIAC, TO-252 |
| 封裝： | PLASTIC, SOT-428, 3 PIN |
| 文件頁(yè)數(shù)： | 136/224頁(yè) |
| 文件大?。?/td> | 2697K |
| 代理商： | BT136S-800G |
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AN1003
Application Notes
http://www.teccor.com
+1 972-580-7777
AN1003 - 4
2002 Teccor Electronics
Thyristor Product Catalog
Figure AN1003.9
Basic Diac-Triac Phase Control
The hysteresis (snap back) effect is somewhat similar to the
action of a kerosene lantern. That is, when the control knob is
first rotated from the off condition, the lamp can be lit only at
some intermediate level of brightness, similar to turning up the
wick to light the lantern. Brightness can then be turned down until
it finally reaches the extinguishing point. If this occurs, the lamp
can only be relit by turning up the control knob again to the inter-
mediate level. Figure AN1003.10 illustrates the hysteresis effect
in capacitor-diac triggering. As R
1
is brought down from its maxi-
mum resistance, the voltage across the capacitor increases until
the diac first fires at point A, at the end of a half-cycle (conduction
angle
θ
i
). After the gate pulse, however, the capacitor voltage
drops suddenly to about half the triggering voltage, giving the
capacitor a different initial condition. The capacitor charges to the
diac, triggering voltage at point B in the next half-cycle and giving
a steady-state conduction angle shown as
θ
for the triac.
Figure AN1003.10
Relationship of AC Line Voltage and Triggering
Voltage
In the Figure AN1003.11 illustration, the addition of a second RC
phase-shift network extends the range on control and reduces
the hysteresis effect to a negligible region. This circuit will control
from 5% to 95% of full load power, but is subject to supply volt-
age variations. When R
is large, C
is charged primarily through
R
3
from the phase-shifted voltage appearing across C
2
. This
action provides additional range of phase-shift across C
1
and
enables C
to partially recharge C
after the diac has triggered,
thus reducing hysteresis. R
3
should be adjusted so that the circuit
just drops out of conduction when R
1
is brought to maximum
resistance.
Figure AN1003.11
Extended Range Full-wave Phase Control
By using one of the circuits shown in Figure AN1003.12, the hys-
teresis effect can be eliminated entirely. The circuit (a) resets the
timing capacitor to the same level after each positive half-cycle,
providing a uniform initial condition for the timing capacitor. This
circuit is useful only for resistive loads since the firing angle is not
symmetrical throughout the range. If symmetrical firing is
required, use the circuit (b) shown in Figure AN1003.12.
Figure AN1003.12
Wide-range Hysteresis Free Phase Control
For more complex control functions, particularly closed loop con-
trols, the unijunction transistor may be used for the triggering
device in a ramp and pedestal type of firing circuit as shown in
Figure AN1003.13.
Load
R1
0.C1
Triac
(Q2010L5)
250 k
3.3 k
R2
120 V
(60 Hz)
(For Inductive
Loads)
100
0.1 μF
Diac
HT34B
Diac Triggers at "A"
Diac Does Not
Trigger at "A"
θ
i
B
A
AC Line
Capacitor
Voltage
[+Diac V
BO
]
[–Diac V
BO
]
θ
R4
C1
Diac
HT34B
Triac
(Q2010L5)
68 k
3.3 k
R1
120 V
(60 Hz)
0.1 μF
Load
R2
250 k
R3
100 k
Trim
C2
0.1 μF
R3
C1
Diac
Triac
(Q2010L5)
15 k
1/2 W
3.3 k
R1
120 V
(60 Hz)
0.1 μF
Load
R2
250 k
D1
D2
D1, D2 = 200 V Diodes
(a)
(b)
C1
Diac
Triac
(Q2010L5)
R3
120 V
(60 Hz)
Load
D1
0.1 μF
R1 = 250 k POT
R2, R3 = 15 k, 1/2 W
D3
R4
R1
D4
R2
D2
R4 = 3.3 k
D1, D2, D3, D4 = 200 V Diodes
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| BT137F-500 | DIODE SWITCHING DUAL-DUAL SERIES 75V 215mA-Io 200mW 4ns-trr SOT-363 3K/REEL |
| BT137F-500D | Thyristor Product Catalog |
| BT137F-500E | Thyristor Product Catalog |
| BT137F-500F | Thyristor Product Catalog |
| BT137F-500G | Thyristor Product Catalog |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| BT136S800T/R | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:TRIAC|800V V(DRM)|4A I(T)RMS|TO-252AA |
| BT136SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Triacs |
| BT136SERIESD | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Triacs logic level |
| BT136SERIESE | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Triacs sensitive gate |
| BT136SSERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Triacs |
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