Data Sheet Rev. B, September 2019 | Subject to change without notice

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ACT4530M

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

Discharge circuit starts to discharge output through

CSP pins when output over voltage is detected.

Discharge circuit brings 9 V down to 5 V in less

than 100 ms.

Output Under-Voltage Protection / Hiccup

Mode

The

ACT4530M

implements

an

under

voltage

protection (UVP) threshold to protect against fault

conditions. If the output voltage is below UVP threshold

for more than 10 us, an over current or short circuit is

assumed, and the converter goes into hiccup mode by

disabling the converter and restarting after hiccup

waiting period of 4.3s .

Thermal Shutdown

If the junction temperature, TJ, increases beyond 160 °C,

the ACT4530 shuts down until TJ drops below 130 °C.

Cord Compensation

The ACT4530M implements cord compensation to

account for voltage drops due to output cable resistance.

It accomplishes this by increasing the output voltage

with increasing output current. The increased output

voltage is measured at the CSP pin.

The cord compensation voltage is derived as:

Δ

VOUT = (VCSP-VCSN)*K

Where K = 3.03

The cord compensation loop is very slow to avoid

disturbing to the voltage loop when there are

load transients.