Novosense Microelectronics has created a pair of isolated digital input chips suitable for 24V industrial control applications that only need power on the output side. 4-channel NSI8604 (SSOP16 package) and 8-channel NSI8608 (SSOP20) provide input/output isolation when converting voltages in the range of -60V to 60V to logic signals. (The third digit is a capital ‘i’, not a numerical ‘1’). ...
Vishay has introduced a photovoltaic mosfet gate driver qualified to AEC-Q102 for automotive use. Called VOMDA1271, “the component is available in a SOP-4 housing. The driver is the only one of its kind in this package size with an isolation voltage of 3.750 V [sic] and a typical open-circuit output voltage of 8.5V”, according to component distributor Rutronik, which is ...
Toshiba has added over-temperature and over-voltage protection features to an 80V 1.4A photo-relay, all inside a 4pin DIP package. Called TLP241BP, it can switch ac or dc though its single isolate 280mΩ (max) output switch – implemented as a pair of back to back mosfets – and handle pulses up to 4.2A (100ms, 1/10 duty). Output leakage is 1μA max ...
Littelfuse has introduced an optically isolated photovoltaic gate driver for mosfets and IGBTs. Essentially, photovoltaic gate drivers are opto-isolated relays without the internal output mosfets, allowing mosfets to be picked appropriate to the load. They are not fast, but they allow a microcontroller to switch a large load on and off across a huge potential difference. This one is called ...
In adding an alternative cutter drive motor (‘spindle’) to an existing cnc machine, an electrically isolated pwm to analogue converter is needed. The machine uses a ‘grbl’ controller, which has an Arduino-based circuit that includes multiple outputs, including a powerful 24V pwm signal that is generally used to drive a 60-80W spindle motor. Update: See a constant current approach to ...
Würth Elektronik has released a detailed and thoughtful app note on using opto-couplers, particularly ‘817’ types. AN0007a* ‘Understanding phototransistor optocouplers’ goes deep into analogue and digital uses, covering performance variations due to process, temperature voltage, current and parasitics, and appropriate design behaviour. “An essential aspect for the development of robust applications involving optocouplers is not only to understand and integrate ...
After announcing 60V opto-mosfet relays last week, this week Panasonic has revealed a 600V type in a 2.65 x 4.45 x1.8mm package. AQY206GV’s 8Ω mosfet (15Ωmax) will switch 600V, and 150mA (450mA pulsed), with a maximum dissipation of 350mW. Its SSOP package is rated for 1,500Vrms isolation, and the whole device will work up to +105°C ambient. Maximuturn on and ...
Panasonic has created a pair of miniature opto-mosfet relays that can handle well over an amp and need little diode current. Both have back-to-back output mosfets, so they can switch ac or dc power, and both come in 4.3 x 6.8 (including leads) x 2.2mm high (SOP4) gull-wing packaging. Days later, it revealed something similar rated at 600V AQY212G3HS can ...
Toshiba has released a ±2.5A output IGBT gate driving photo-coupler with and isolated fault feedback, that can also drive mosfet gates. Called TLP5212, it “features a new totem pole output with two n-channel mosfets,” according to the company. “In addition, the photocoupler incorporates de-saturation detection, active Miller clamp, under-voltage lock-out, soft gate turn-off and a fault output.” Maximum propagation delay ...
Omron is aiming at test and measurement with a miniature 200V 350mA mosfet opto-relay. In a 3.4 x 2.1mm P-SON (power small outline no lead) package and operating across -40 to +110°C, “this device can realise a current load of 75% higher than a comparable SOP4 type relay”, said the company, justifying this with the figure 49mA/mm2 for the P-SON relay and ...
Electronics Weekly Electronics Design & Components Tech News
