Data Sheet Rev. G, November 2023 | Subject to change without notice

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ACT4529

40 V/3.0 A CV/CC Buck Converter Featuring QC2.0, USB Auto-Detect and USB-PD

®

APPLICATIONS INFORMATION

Current Sense Resistor

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

If output current hits current limit, output voltage drops

to keep the current to a constant value.

The following equation calculates the constant

current limit.

������������������������������������������������������������������������(������������)= 66������������������������

������������������������������������(������������������������)

(6)

Where Rcs is current sense resistor.

PCB Load

Trace

Kevin Sense

Traces

Sense

Resistor