Toshiba TLX9309 analog output IC photocoupler

Toshiba Electronic Devices & Storage has launched an analog output IC photocoupler that enables high-speed communications in automotive applications — especially electric vehicles (EV) and hybrid electric vehicles (HEV).

The TLX9309 consists of a high-output GaAlAs light-emitting diode (LED) that is optically coupled to a high-speed detector. The detector consists of a photodiode and a transistor integrated onto a single chip. A Faraday shield has been integrated onto the photodetector chip to provide enhanced levels of common-mode transient immunity — typically up to 15 kV/μs — an important parameter in electrically noisy automotive environments.

By separating the photodiode and amplification transistor, the collector capacitance is reduced. This is said to reduce propagation delays and make the open-collector TLX9309 faster than transistor output devices. Propagation delay times are between 0.1 and 1 μs, with the difference between high to low and low to high transition (|tpLH-tpHL|) no more than 0.7 μs. This makes the product suitable for high-speed communications such as inverter control or as an interface to intelligent power modules (IPM).

Electrically, the device offers 3750 V_rms of isolation with 5 mm of creepage and clearance for safety isolation. It operates from a supply in the range -0.5 to 30 VDC and can drive up to 25 mA at output voltages up to 20 V. The current transfer ratio is in the range 15–300%.

The product is packaged in a 3.7 x 7 x 2.2 mm RoHS-compliant 5-pin SO6 package and operates over the temperature range -40 to +125°C. The device is AEC-Q101 qualified for use in automotive applications.