ACPL-P349-560E Isolators

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Isolators are a type of special interface device which, when used in motor control applications, provide galvanic isolation between the controlling device and the circuit being controlled. Gate drivers are devices used to control driving currents and voltages to semiconductor switches such as insulated gate bipolar transistors (IGBTs) and other power semiconductor devices. In this article, we will discuss the application field and working principle of ACPL-P349-560E, which is a high side gate driver optocoupler.

ACPL-P349-560E is a high side gate driver optocoupler which consists of an infrared emitting diode, phototransistor and a gate driver circuit. This optocoupler provides up to 1.5 Amps of drive current for controlling power devices, allowing designers to use low voltage signals from the MCU or PLC to control large voltage devices on a variety of DC link applications. In addition, the optocoupler has an integrated thermal protection circuit to monitor the temperature of the power device and shut down the device in case of an over temperature event.

The optimal working conditions for the device are a supply voltage of 5V, an ambient temperature range of 0 to 70C and a maximum capacitive load of 1.5N. In addition, the device supports a wide common-mode range of 0V to 10V. This means that the signal from the MCU or PLC does not have to be in the same voltage potential as the output.

When the device is used as a high side gate driver, the input signal to the optocoupler will come from the MCU or PLC, and the output will be connected to the gate of the power device (IGBT or MOSFET). The optocoupler will then convert the low-voltage signal from the MCU or PLC into a high voltage pulse which is provided to the power device. This high voltage pulse will turn the power device ON or OFF as required.

The working principle of the ACPL-P349-560E is based on optocoupling which is achieved through an LED and a phototransistor. The LEDs are driven by the MCU or PLC signals and emits a light which is received by the phototransistor. The phototransistor then generates a voltage across its collector and emitter, and this voltage is amplified and used to generate the necessary pulse to turn the power device ON or OFF as required.

The ACPL-P349-560E is an ideal solution for motor control applications, as it provides up to 1.5 Amps of drive current, and has a wide common-mode range of 0V to 10V. The optocoupler also provides thermal protection to ensure safe operation. In addition, the device is small and compact, and its solderable terminals facilitate easy integration with power circuits.

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