Isolator

Toshiba has created a pair of highspeed photo relays for pin-switching in semiconductor test equipment. “Improved infrared LEDs and optimised photodiode arrays in these models enable switch-on times to be reduced to 150µs while maintaining signal quality,” according to distributor Rutronik, which is stocking the parts. “In addition, the S-VSON4T package saves space on the circuit board.” – it measures ...

Toshiba has introduced an opto-isolated SiC gate driver, that includes an active Miller clamp to tame self-turn-on behaviour in the driven device. Named TLP5814H, it is a “gate driver photocoupler suitable for driving silicon carbide mosfets in industrial equipment like inverters, uninterruptible power supplies and photovoltaic inverters which experience harsh thermal environments”, according to the company. “The Miller clamp circuit ...

Vishay has created a fast opto-coupler that can operate at 25Mbit/s. Called VOIH72A, is has a digital buffering on the input and output. “The component combines a maximum pulse distortion of only 6ns, a maximum supply current of 2mA and a supply voltage range of 2.7 to 5.5V, and is fast enough to support bus systems such as SPI, as ...

Toshiba has introduced some 50Mbit/s four-channel automotive high-speed digital isolators for digital signals. It is the DCM34xx01 series, and it has been designed to typically provide 100kV/μs common-mode transient immunity, in electric vehicle on-board chargers and battery management systems. Depending on the exact part, there can be: Four forward channels Three forward and one reverse Two forward and two reverse ...

Texas Instruments is aiming at robot motor control up to 60V with a series of isolated ADCs that include 200V barriers and come in 8pad 3.5 x 2.7mm VSON packaging. Each has a ΣΔ ADC on the hot side, an isolation barrier, then a digital interface on the cool side. The output is a modulated bit stream synchronised to an ...

TDK has shrunk its 500V gate drive transformers to 11 x 13mm and 11mm high, smaller than its existing E10EM series. The new parts, called the EP9 series and aimed at both IGBTs and mosfets, are built on a MnZn ferrite core with surface-mount L-pin construction. Creepage and clearance is 5mm, peak withstanding is 2.5kVac 50Hz, and coupling capacitance is ...

Distributor Rutronik is stocking an isolated single-channel gate driver for GaN hemts that comes in a 4.9 x 6 x 1.65mm SOP-JW8 package. Made by Rohm and called BM6GD11BFJ-LB, they have “an isolation voltage of up to 2,500Vrms, a minimum input-output latency of 60ns and a minimum input pulse width of 65ns”, said Rutronik. “Under-voltage lock-out is integrated into the ...

For the gate drivers of high-power IGBTs, mosfets, SiC mosfets and GaN hemts, Infineon has introduced an isolated power supply IC that can generate asymmetric output voltage rails. Each member of the 2EP1xxR family, as it will be known, has a full bridge of mosfets at its output for driving both ends of a transformer primary, whose secondary can be ...

Vishay has stretched an SO-6 package to accommodate 1kV operation from opto-based mosfet and IGBT gate drivers. The body is ~7mm from end to end and creepage is 8mm. Clearance is 7mm for the ‘option 9’ package which has conventionally bent legs, or 8mm for the ‘option 8’ package which has widely-splayed legs (see image). Peak working voltage is 1.14kV ...

Pondering the good-enough isolated probing circuit I soldered up yesterday (repeated below), I wondered if there was a ‘100%’ clean alternative that was not much more complicated and would not have the slightly soggy, although acceptable, characteristics. (That said the led still gets brighter and dimmer when it is ‘on’, depending on cell voltage). Without making it – so bare ...