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Data Sheet
DIODE OR’ing APPLICATIONS
6V
ADP198
rectifier. For example, at 85°C, the reverse current of a Schottky
rectifier can be as high as 30 μA with only 2.5 V of reverse bias.
AC
ADP198
LOAD
V OUT =
circuitry that senses the voltage differential between the input
and output voltage. When the difference between the input
voltage and output voltage exceeds 75 mV, the ADP198 is
switched on.
V2
+
VIN
VOUT
V2 – (I LOAD × R ON )
1A
EN
Figure 31. ADP198 in a Typical Diode OR’ing Application
battery are OR’ed together to provide a seamless transition from
the primary (ac) supply to the secondary (V2) supply when the
primary supply is disconnected. By connecting the enable input
of the ADP198 to V2, the transition from ac power to battery
power is automatic.
SLOPE =
1
R ON
SCHOTTKY
FORWARD
VOLTAGE
75mV (V HYS )
300mV
FORWARD VOLTAGE (V)
characteristics of a Schottky diode and the ADP198 . The low on
resistance of the ADP198 makes it far superior to a Schottky
diode in diode OR’ing applications.
In addition to low on resistance, the ADP198 reverse leakage
current is much lower than a typical 1 A, 20 V Schottky
Rev. G | Page 15 of 16
Figure 32. Forward Voltage vs. Forward Current of a Schottky
Diode and ADP198
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