ACT4529M

Rev 1, 23-Feb-17

- 9 -

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Current Sense Resistors

The traces leading to and from the sense resistor

can be significant error sources. With small value

sense resistors, trace resistance shared with the

load can cause significant errors. It is recommended

to connect the sense resistor pads directly to the

CSP and CSN pins using “Kelvin” or “4-wire”

connection techniques as shown below.

Current Limit Setting

When the output current reaches current limit, the IC

limits the peak switch current on a cycle-by-cycle

basis. This reduces the output voltage to keep the

output current at a constant value.

The following equation calculates the peak

current limit.

Where Rcs is current sense resistor.

The maximum output current is defined by

APPLICATIONS INFORMATION

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