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MAX14850
Six-Channel Digital Isolator
LIFE EXPECTANCY
vs. WORKING ISOLATION VOLTAGE
V CCA
1000
V CCB
V OUTA_
V OUTB_
V I/OA_
V I/OB_
100
50
10
1
0.1
V IOWM = 200V RMS
400μs/div
0.001
0
100 200 300 400 500 600 700 800
WORKING ISOLATION VOLTAGE (V IOWM ) - V RMS
Figure 3. Undervoltage Lockout Behavior
Applications Information
Affect of Continuous Isolation
on Lifetime
High-voltage conditions cause insulation to degrade
over time. Higher voltages result in faster degradation.
Even the high-quality insulating material used in the
MAX14850 can degrade over long periods of time with a
constant high-voltage across the isolation barrier. Figure 4
shows the life expectancy of the MAX14850 vs. working
isolation voltage.
Maxim Integrated
Figure 4. Life Expectancy vs. Working Isolation Voltage
Power-Supply Sequencing
The MAX14850 does not require special power-supply
sequencing. The logic levels are set independently on
either side by V CCA and V CCB . Each supply can be pres-
ent over the entire specified range regardless of the level
or presence of the other.
Power-Supply Decoupling
To reduce ripple and the chance of introducing data
errors, bypass V CCA and V CCB with 0.1 F F ceramic
capacitors to GNDA and GNDB, respectively. Place the
bypass capacitors as close to the power-supply input
pins as possible.
14
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