Photovoltaic-output photocoupler for power Mosfets| Electronics Weekly

It is for high-side and back-to-back configurations used in solid-state relays (SSRs). For example, possible applications include automotive battery management systems (BMS), onboard chargers (OBC), inverters, energy storage systems (ESS) and industrial power control equipment.

The company writes:

“As automotive and industrial systems continue shifting from mechanical relays to solid-state relays, designers require reliable, highly isolated gate drive solutions that eliminate the need for secondary-side power supplies. The new TLX9920 generates the gate drive voltage directly from its photovoltaic output, enabling simplified circuit design while maintaining reinforced isolation between control and power domains.”

TLX9920 features

It comes in a SO6L package measuring 3.84mm × 10.0mm × 2.1mm). And has a minimum creepage distance of 8mm and a high isolation voltage rating of 5000Vrms (min.).

This makes it suitable for applications requiring reinforced insulation, highlights Toshiba. For example, IEC 60664-1 specifies that a creepage distance of 8mm may be required for systems operating at 400V or higher in pollution degree 2 environments.

It has a minimum open-circuit voltage (VOC) of 13.5V. And minimum short-circuit current (ISC) of 8μA at a forward current (IF) of 10mA. This means the TLX9920 provides gate drive capability for Mosfet control without the need for an additional isolated bias supply.

Its integrated discharge circuit further simplifies design and ensures reliable turn-off performance, adds Toshiba.

You can read more about the photovoltaic-output photocoupler on the company website, including the TLX9920

datasheet (PDF).

See all our Toshiba content.