Optical Semiconductor Devices
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Toshiba’s isolation amplifiers provide optically coupled isolation between input and output, and incorporate a high-precision sigma-delta AD converter on the input side.These isolation amplifiers are primarily suitable for current and voltage sensing applications.
They provide stable operation even for noisy motor control applications because of their highest-class linearity in the industry and outstanding common-mode transient immunity (CMTI).
Recently, FA equipment such as servo amplifiers and AC drives is required to operate more accurately: required to provide accurate feedback to microcomputers by monitoring motor phase current or bus voltage fluctuation. In order to satisfy such requirements, the optical isolation amplifiers are equipped with ΔΣ type AD converter circuit in their input side, featuring industry leading highly accurate linearity: 0.02 %(typ.) for analog output products and 4 LSB (typ.) for digital output products.
Fig.1 shows comparison on the input side current consumption dependency of input voltage.
The TLP7820/7930/7830/7930 implement Toshiba original digital modulator/demodulator and it suppresses the IDD1 fluctuation. Thus, the maximum operation current can be reduced and it contributes your low-power circuit design.
Fig.1 Input voltage dependency at input side supply current -TLP7820 vs. competitor item-
Fig.2 shows package comparison between TLP7820/7830 and competitor item.
The TLP7820/7830 adopt a low profile (height: 2.3mm max) package which is thinner than competitor item. This is suitable for compact size applications.
Fig.2 Package side view -TLP7820 vs. competitor item-