MAX14850 Datasheet, PDF (13/16 Pages) Maxim Integrated Products – Six-Channel Digital Isolator

MAX14850
Six-Channel Digital Isolator
VCCA
VCCB
VOUTA_
VOUTB_
VI/OA_
VI/OB_
400µs/div
Figure 3. Undervoltage Lockout Behavior
LIFE EXPECTANCY
vs. WORKING ISOLATION VOLTAGE
1000
100
V_IOWM = 200V_RMS
50
10
1
0.1
0.001
0 100 200 300 400 500 600 700 800
WORKING ISOLATION VOLTAGE (VIOWM) - VRMS
Figure 4. Life Expectancy vs. Working Isolation Voltage
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.
Power-Supply Sequencing
The MAX14850 does not require special power-supply
sequencing. The logic levels are set independently on
either side by VCCA and VCCB. 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 VCCA and VCCB with 0.1FF ceramic
capacitors to GNDA and GNDB, respectively. Place the
bypass capacitors as close to the power-supply input
pins as possible.
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