ADuM5401/ADuM5402/ADuM5403/ADuM5404
I
I
ISO
DD1(Q)
The preceding magnetic flux density values correspond to specific
current magnitudes at given distances from the ADuM5401/
ADuM5402/ADuM5403/ADuM5404 transformers. Figure 26
expresses these allowable current magnitudes as a function
of frequency for selected distances. As shown in Figure 26,
the ADuM5401/ ADuM5402/ADuM5403/ADuM5404 are
extremely immune and can be affected only by extremely large
currents operated at high frequency very close to the compo-
nent. For the 1 MHz example, a 0.5 kA current would need to
be placed 5 mm away from the ADuM5401/ADuM5402/
ADuM5403/ADuM5404 to affect component operation.
1k
E
CONVERTER
PRIMARY
CONVERTER
SECONDARY
I
DD1(D)
I
I
ISO(D)
DDP(D)
PRIMARY
DATA
I/O
SECONDARY
DATA
I/O
4CH
4CH
Figure 27. Power Consumption Within the
ADuM5401/ADuM5402/ADuM5403/ADuM5404
Dynamic I/O current is consumed only when operating a channel
at speeds higher than the refresh rate of fr. The dynamic current
of each channel is determined by its data rate. Figure 19 shows the
current for a channel in the forward direction, meaning that the
input is on the VDD1 side of the part. Figure 20 shows the current
for a channel in the reverse direction, meaning that the input is on
the VISO side of the part. Both figures assume a typical 15 pF load.
DISTANCE = 1m
100
10
DISTANCE = 100mm
1
DISTANCE = 5mm
The following relationship allows the total IDD1 current to be
calculated:
0.1
I
DD1 = (IISO × VISO)/(E × VDD1) + Σ ICHn; n = 1 to 4
(1)
0.01
where:
1k
10k
100k
1M
10M
100M
I
I
DD1 is the total supply input current.
CHn is the current drawn by a single channel determined from
MAGNETIC FIELD FREQUENCY (Hz)
Figure 26. Maximum Allowable Current for Various Current-to-
ADuM5401/ADuM5402/ADuM5403/ADuM5404 Spacings
Figure 19 or Figure 20, depending on channel direction.
I
ISO is the current drawn by the secondary side external load.
Note that in combinations of strong magnetic field and high
frequency, any loops formed by printed circuit board traces
could induce error voltages sufficiently large to trigger the
thresholds of succeeding circuitry. Care should be taken in
the layout of such traces to avoid this possibility.
E is the power supply efficiency at 100 mA load from Figure 11
at the VISO and VDD1 condition of interest.
The maximum external load can be calculated by subtracting
the dynamic output load from the maximum allowable load.
POWER CONSUMPTION
I
ISO(LOAD) = IISO(MAX) − Σ IISO(D)n; n = 1 to 4
where:
ISO(LOAD) is the current available to supply an external secondary
side load.
ISO(MAX) is the maximum external secondary side load current
available at VISO
ISO(D)n is the dynamic load current drawn from VISO by an input
or output channel, as shown in Figure 21 and Figure 22.
(2)
The VDD1 power supply input provides power to the iCoupler
data channels, as well as to the power converter. For this reason,
the quiescent currents drawn by the data converter and the
primary and secondary I/O channels cannot be determined
separately. All of these quiescent power demands have been
combined into the IDD1(Q) current, as shown in Figure 27. The
total IDD1 supply current is equal to the sum of the quiescent
operating current; the dynamic current, IDD1(D), demanded by
the I/O channels; and any external IISO load.
I
I
.
I
The preceding analysis assumes a 15 pF capacitive load on each
data output. If the capacitive load is larger than 15 pF, the additional
current must be included in the analysis of IDD1 and IISO(LOAD)
.
Rev. 0 | Page 19 of 24
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