P9242-R-EVK Evaluation Board User Manual
© 2016 Integrated Device Technology, Inc.
8
December 22, 2016
2.3
Adjustment of Over-Current Limit
The over-current protection (OCP) is designed to protect the transmitter from operating conditions that could potentially cause damage or
unexpected behavior from the system. The input current is continuously monitored during the power transfer stage. If the input current goes
above the OCP threshold of the programmed current limit, the P9242-R will increase the switching frequency or reduce the duty cycle in order
to keep the input current below the OCP value. The current limit can be selected by setting the voltage on the ILIM pin through the resistor
divider R48 and R40. On the P9242-R-EVK, the ILIM pin is pulled up to 3.3V through R48. R40 is unpopulated; therefore, the current limit is
set to 2.3A.
Figure 6. Over-Current Limit vs. V
ILIM
0
200
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600
800
1000
1200
1400
1600
1800
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2200
2400
2600
0
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1.6
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3.2
3.4
O
v
e
r
C
u
rr
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[m
A
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V
ILIM
[V]
