Toshiba Automotive Photocouplers & Photorelays
Toshiba Automotive Photocouplers and Photorelays are designed to maximize performance in the most rigorous of applications, vehicles. Toshiba's optical components are developed with the future in mind. Due to increased market demand for electric vehicles more devices are required to provide isolation across several voltage levels in areas such as Battery Management Systems (BMS), Inverters, and DC-DC Converters. Additionally, photorelays are a great solid state replacement for a traditional mechanical relay. One of the main benefits of using photorelays versus mechanical relays is reliability and longevity which is especially important in vehicles which have longer lifetimes.
Features
- Operating temperature
- -40°C to +125°C (photocouplers)
- -55°C to +105°C (photorelays)
- Isolation voltage (BVS) of 3750Vrms
- AEC-Q101
- Small surface-mount packaging
- Solid-state operation
- High speed communication
Applications
- Automotive
- Battery management systems (BMS)
- Inverters
- DC-DC converters
- Fuel battery control
- MOSFET gate drivers
Product Types
Toshiba IC Output Photocouplers range from 1Mbps to 20Mbps. These photocouplers are ideal for communicating over an isolation barrier. Output configurations are either open collector or totem-pole structured. All of these IC output photocouplers come in a 5-pin 3.7mm × 7.0mm × 2.1mm SO-6 package.
Toshiba Transistor Output Photocouplers employ a transistor output within the internal structure; therefore, the main characteristics are similar to a transistor. Current Transfer Ratio (CTR) varies between 50 to 900, and VCEO is either 40V or 80V, depending on preference. VCE(sat) and IC(max) are constant at 0.4V and 0.05A, respectively. These transistor photocouplers are packaged in a 4-pin SO-4, measuring 2.6mm × 7.0mm × 2.1mm, and a 4-pin SO-6, measuring 3.7mm × 7.0mm × 2.1mm.
Toshiba Photovoltaic Photocouplers offer two different photovoltaic output photocouplers. The devices employ a photodiode array as the primary method of coupling. Both perform similarly, offering short circuit current minimums (ISC(min)) of 12μA and open voltage minimums (VOC(min)) of 7V. The main difference between the two is the internal control circuit, which allows the TLX9906 to turn off about 80% faster (0.2ms vs 1ms). These two also come in a 4-pin SO-6, measuring 3.7mm × 7.0mm × 2.1mm.
Toshiba Photorelays are a great modern solution for replacing the traditional mechanical relay. The most significant benefit is the solid-state functionality, which allows for better longevity, versus the traditional mechanical relay, which repeatedly moves a coil back and forward. This lack of wear and tear is highly desirable in a product that is designed to have a long lifespan. Also, photorelays are functionally faster and less noisy. There is no bouncing or physical movement. Signals are clean and fast, two essential characteristics. Toshiba's first AEC-Q101 grade photorelay features an off-state voltage VOFF maximum of 600V and a maximum on-state current (ION) of 15mA. This is available in the 4 pin SO-6 package, which is substantially smaller than a traditional mechanical relay.
Toshiba Automotive Photocouplers are available in three families: IC outputs with several configurations, Transistor Outputs, and Photovoltaic Outputs. All isolation voltages are guaranteed for 3750Vrms.
Block Diagram
Videos
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