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Primary-side supply current
Figure 2. 6 shows the relationships between the input voltage and the primary-side supply
current of the TLP7820 ( B) side) and a competitor's isolation amplifier ( A) side). The
primary-side supply current of the competitor's isolation amplifier increases with input voltage
while the TLP7820 has a unique digital encoder/decoder technology to maintain the primary-
side supply current at almost a constant level around 9 mA (typical) over a range of input
voltage (recommend operating range: -0.2 to +0.2 V). This contributes reduction of the
maximum circuit current, simplifying the design of a primary-side power supply.
A) Competitor A
Figure 2.6 Relationships between the input voltage and the primary-side supply
Figure 2.7 (B) shows the changes in the primary-side supply current in response to input
voltage changes at a given frequency in Figure 2.7 (A).
A) Input voltage changes
Figure 2.7 Primary-side supply current waveforms in response to input voltage
The primary-side supply current of the competitor's isolation amplifier changes between 9
mA and 13 mA in response to changes in input voltage while the primary-side supply current
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Toshiba Electronic Devices & Storage Corporation
current of isolation amplifiers
B) Primary-side supply current waveforms
changes
8 / 19
RD014-RGUIDE-01
B) TLP7820
Competitor
TLP7820
2018-03-15
Rev. 1
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