Optoelectronics

Photovoltaic couplers come in small SO6 packages

1st October 2014
Mick Elliott

Toshiba’s new photovoltaic couplers TLP3905 and TLP3906 are available in SO6 packages at distributor Rutronik. Due to their extended operating temperature ranges and increased isolation voltages, they are ideal for use in measuring instruments, as MOSFET gate drivers or the replacement of mechanical relays.

The structure of a photovoltaic coupler is a photorelay without a MOSFET chip; in combination with an external MOSFET of users’ choice an isolated relay can be created. This makes it possible to realise larger voltages and currents and exceed the capabilities of existing photorelay products.

The new TLP3905 and TLP3906 expand application possibilities by increasing the maximum operating temperature to +125°C and increasing the isolation voltage by 50% to 3750Vrms (min) in comparison to the predecessors.

In addition, TLP3906 integrates a control circuit for releasing the MOSFET gate charge, ensuring a turn-off speed of 0.3ms, approximately one third of TLP3905. The device also guarantees a minimum LED trigger current IFT (max) of 3mA to ensure low power dissipation of LED current. Both devices provide short circuit current ISC of min 12µA, the open voltage VOC is min. 7V.

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