TLP748J(D4,F)

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TLP748J(D4,F) Application Field and Working Principle

The TLP748J(D4,F) are optoisolators with Triac and SCR output . As optoisolators, they are mainly used for electrical isolation and zero-cross detection. They are widely used for sections such as data transmission, peripheral control, industrial process automation, home appliances and switch device control.

TLP748J(D4,F) Application Fields

• Data communication such as RS-485/422 networks
• Peripheral control of home appliances (microwave oven, fan, humidifier, etc..)
• Industrial process automation
• Current overloading protection for Smart electric meters, 5/4-wire motor drive
• Control switches in a low-voltage AC motor driver circuit

TLP748J(D4,F) Working Principle

The TLP748J(D4,F) comprises a GaAlAs infrared LED and an opto-MOSFET IC in a surface-mount package. The LED and photodiode are optically coupled so that the LED can be used to control the MOSFET even with high-voltage isolation between the input and output.

The opto-MOSFET features a low on-state resistance (RDS(ON)) which is ideal for driving load under low-power conditions. To ensure the best electrical performance, a trimming resistor is incorporated into the opto-MOSFET to allow adjustment of the on-state resistance.

In operation, the LED is switched on by applying a forward voltage to one of the leads, allowing current to flow through the opto-diode. This current triggers the MOSFET, switching on the other lead and allowing current to flow through the load. The LED is switched off by reversing the voltages, and the circuit is interrupted.

To ensure the best electrical performance, it is necessary to ensure that the system has good thermal stability. This is achieved by using a low on-state resistance (RDS(ON)) and a trimming resistor in the opto-MOSFET to adjust the on-state resistance.

The opto-MOSFET also features low switching noise, making it ideal for noise sensitive applications such as switch mode power supplies. It also features low capacitance for faster switching and a high temperature range for operation in extreme temperatures.

Conclusion

The TLP748J(D4,F) are optoisolators with Triac and SCR output, making them ideal for use in a number of applications such as data transmission, peripheral control, industrial process automation, home appliances and switch device control. The opto-MOSFET features low on-state resistance and trimming resistor, ensuring good electrical performance. It also features low switching noise for noise sensitive applications and a high temperature range for operation in extreme temperatures.

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