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Photocoupler has increased open voltage for isolated solid-state relays

A minimum open voltage (VOC) of 14V in the photocouple is double that of Toshiba’s existing TLP3906 and means that only a single device is required to drive the gate of a high voltage power MOSFET.

The photocoupler is housed in a thin SO6L package measuring just 3.84 x 10 x 2.1mm, making it suitable for driving the gates of high voltage power MOSFETs used to develop a galvanically-isolated solid-state relay (SSR) function, says Toshiba.

SSRs incorporate a photo-TRIAC, a photo-transistor or a photo-thyristor as the output device and are generally suitable for applications that require on/off control of large electrical currents such as industrial equipment. Typical examples are the I/O relay output for PLCs, inrush current protection in PSUs, battery voltage monitoring in battery monitoring systems and ground fault detection. They can also be used to switch the power and signal lines in instrumentation applications. To configure an isolated SSR to handle high voltage, large current switching, designers generally combine a photovoltaic coupler with a MOSFET.

The TLP3910 contains the optical elements but not the MOSFET. The minimum open voltage (VOC) of 14V is double that of the TLP3906 so only a single device is required to drive the gate of a high-voltage power MOSFET. This reduces the part count, improves reliability, saves PCB space and bill of materials (BoM) cost.

The built-in discharge circuit has been improved to realise a typical turn-off time of 0.1ms, which is about one-third that of the TLP3906 and about one-thirtieth that of another Toshiba product, the TLP191B. The associated typical turn-on time is 0.3ms. Together, these ensure high speed operation in end applications, says the company.

The TLP3910 is Toshiba’s first photovoltaic coupler to feature a minimum isolation voltage (BVS) of 5,000V rms. Creepage is 8mm while relevant UL/cUL approvals allow the photocoupler to be used in industrial equipment driven by 400V AC systems.

The photocoupler also has a high-temperature operation range of -40 to 125°C.

Volume production shipments of the new devices start today.



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