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| 型号： | FODM3083 |
| 厂商： | Fairchild Optoelectronics Group |
| 文件页数： | 7/13页 |
| 文件大小： | 0K |
| 描述： | IC TRIAC ZERO X 800V 5MA 4-MFP |
| 产品目录绘图： | 4-MFP Package |
| 标准包装： | 3,000 |
| 电压 - 隔离： | 3750Vrms |
| 通道数： | 1 |
| 电压 - 断路： | 800V |
| 输出类型： | 交流过零三端双向可控硅开关 |
| 电流 - 栅极触发电流 (Igt)（最大）： | 5mA |
| 电流 - 保持 (Ih)： | 300µA |
| 电流 - DC 正向(If)： | 60mA |
| 电流 - 输出 / 通道： | 70mA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 4-SMD，鸥翼型 |
| 供应商设备封装： | 4-MFP |
| 包装： | 管件 |
Determining the Power Rating of the Series Resistors Used in a Zero-Cross
Opto-TRIAC Driver Application
The following will present the calculations for
determining the power dissipation of the current
limiting resistors found in an opto-TRIAC driver
interface.
Figure 10 shows a typical circuit to drive a sensitive
gate four quadrant power TRIAC. This ?gure provides
typical resistor values for a zero line cross detecting
opto-TRIAC when operated from a mains voltage of
20V to 240V. The wattage rating for each resistor is
not given because their dissipation is dependent upon
characteristics of the power TRIAC being driven.
Recall that the opto-TRIAC is used to trigger a four
quadrant power TRIAC. Please note that these opto-
TRIACs are not recommended for driving
“snubberless” three quadrant power TRIACs.
Under normal operation, the opto-TRIAC will ?re when
the mains voltage is lower than the minimum inhibit
trigger voltage, and the LED is driven at a current
greater than the maximum LED trigger current. As an
example for the FODM3063, the LED trigger current
should be greater than 5mA, and the mains voltage is
less than 10V peak. The inhibit voltage has a typical
range of 10V minimum and 20V maximum. This
means that if a suf?cient LED current is ?owing when
the mains voltage is less than 10V, the device will ?re.
If a trigger appears between 10V and 20V, the device
may ?re. If the trigger occurs after the mains voltage
has reached 20Vpeak, the device will not ?re.
The power dissipated from resistors placed in series
with the opto-TRIAC and the gate of the power TRIAC
is much smaller than one would expect. These current
handling components only conduct current when the
mains voltage is less than the maximum inhibit
voltage. If the opto-TRIAC is triggered when the mains
voltage is greater than the inhibit voltage, only the
TRIAC leakage current will ?ow. The power dissipation
in a 360 ? resistor shown in Figure 10 is the product of
the resistance (360 ? ) times the square of the current
sum of main TRIAC’s gate current plus the current
?owing gate to the MT2 resistor connection (330 ? ).
This power calculation is further modi?ed by the duty
factor of the duration for this current ?ow. The duty
factor is the ratio of the turn-on time of the main TRIAC
to the sine of the single cycle time. Assuming a main
TRIAC turn-on time of 50μs and a 60Hz mains
voltage, the duty cycle is approximately 0.6%.
The opto-TRIAC only conducts current while triggering
the main TRIAC. Once the main TRIAC ?res, its on-
state voltage is typically lower than the on-state
sustaining voltage of the opto-TRIAC. Thus, once the
main TRIAC ?res, the opto-TRIAC is often shunted off.
This situation results in very low power dissipation for
both the 360 ? and 330 ? resistors, when driving a
traditional four quadrant power TRIAC.
If a three quadrant “snubberless” TRIAC is driven by
the opto-TRIAC, the calculations are different. When
the main power TRIAC is driving a high power factor
(resistive) load, it shuts off during the fourth quadrant.
V CC
R in
1
2
FODM3062
FODM3063
FODM3082
FODM3083
4
3
360 ?
39*
HOT
240 VAC
Typical circuit for use when hot line switching of 240VAC
is required. In this circuit the “hot” side of the line is
switched and the load connected to the cold or neutral
side. The load may be connected to either the neutral or
hot line.
R in is calculated so that I F is equal to the rated I FT of the
part, 5mA for the FODM3063/83 and 10mA for the
FODM3062/82. The 39 ? resistor and 0.01 μ F capacitor are
330
0.01
LOAD
NEUTRAL
for snubbing of the triac and may or may not be necessary
depending upon the particular triac and load used.
*
For highly inductive loads (power factor < 0.5), change this value to 360 ohms.
Figure 10. Hot-Line Switching Application Circuit
?2006 Fairchild Semiconductor Corporation
FODM3062, FODM3063, FODM3082, FODM3083 Rev. 1.0.9
7
www.fairchildsemi.com
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相关代理商/技术参数 |
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| FODM3083_NF098 | 功能描述:三极与 SCR 输出光电耦合器 800V Zero Crossing RoHS:否 制造商:Vishay Semiconductors 输出设备:PhotoTriac 每芯片的通道数量: 绝缘电压:3750 Vrms 正向电流:10 mA 正向电压:1.2 V 最大触发电流:10 mA 关断状态下输出电压-VDRM:600 V 最大连续输出电流: 零交叉电路: 封装:Reel |
| FODM3083R1 | 功能描述:三极与 SCR 输出光电耦合器 800V ZERO CROS TRIAC RoHS:否 制造商:Vishay Semiconductors 输出设备:PhotoTriac 每芯片的通道数量: 绝缘电压:3750 Vrms 正向电流:10 mA 正向电压:1.2 V 最大触发电流:10 mA 关断状态下输出电压-VDRM:600 V 最大连续输出电流: 零交叉电路: 封装:Reel |
| FODM3083R2 | 功能描述:三极与 SCR 输出光电耦合器 800V ZERO CROS TRIAC RoHS:否 制造商:Vishay Semiconductors 输出设备:PhotoTriac 每芯片的通道数量: 绝缘电压:3750 Vrms 正向电流:10 mA 正向电压:1.2 V 最大触发电流:10 mA 关断状态下输出电压-VDRM:600 V 最大连续输出电流: 零交叉电路: 封装:Reel |
| FODM3083R2_NF098 | 功能描述:三极与 SCR 输出光电耦合器 800V ZEROCROS TRIAC RoHS:否 制造商:Vishay Semiconductors 输出设备:PhotoTriac 每芯片的通道数量: 绝缘电压:3750 Vrms 正向电流:10 mA 正向电压:1.2 V 最大触发电流:10 mA 关断状态下输出电压-VDRM:600 V 最大连续输出电流: 零交叉电路: 封装:Reel |
| FODM30XX | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:4-Pin Full Pitch Mini-Flat Package Random-Phase Triac Driver Output Optocouplers |
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