High accuracy optical coupling analogue isolation amplifiers
Toshiba has announced a pair of photocouplers for current sensing and voltage sensing in power converters. The TLP7820 and TLP7920 are analogue output type devices that target applications including servo amplifiers, inverters, power sources and photovoltaic inverters.
To meet these requirements of modern factory automation applications such as servo amplifiers and inverters, Toshiba has equipped the TLP7820 and TLP7920 with a delta sigma analogue-to-digital converter at the input side that is said to enable the devices to achieve a high level of linearity.
TLP7820 and TLP7920 are claimed to provide a guaranteed Common Mode Transient Immunity of 20kV/us, which is claimed to enable stable operation in electrically noisy environments and makes them suitable for motor control applications. Isolation is provided through an optical barrier with a guaranteed isolation voltage of 5000Vrms. Operating temperature range is -40 to 105°C.
A choice of two package types is available: TLP7920 is supplied in a DIP8 package; TLP7820 comes in an SO8L package, which is more compact, said to take up 30% less board space and featuring a 40% lower profile.
- See more at: http://www.newelectronics.co.uk/electronics/high-accuracy-optical-coupling-analogue-isolation-amplifiers/89519/#sthash.1cgcKt1h.dpuf
