ACT4530
Rev 1.0, 19-Nov-2018
FUNCTIONAL DESCRIPTION
Output Over Voltage Discharge
Discharge circuit starts to discharge output through
CSP pins when output over voltage is detected.
Discharge circuit brings 9V down to 5V in less than
100ms.
Output Under-Voltage Protection /
Hiccup Mode
The ACT4530 implements an under voltage
protection (UVP) threshold to protect against fault
conditions. If the output voltage is below UVP
threshold for more than 10us, 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 ACT4530 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:
ΔVout = (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.
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