EA411US datasheet(9/15 Pages) ACTIVE-SEMI

9 / 15 page

ACT411

Rev 4, 27-Feb-14

www.active-semi.com

Innovative PowerTM

- 9 -

ActivePSR

TM is a trademark of Active-Semi.

FB Over Voltage Protection

The

ACT411

includes

output

over-voltage

protection circuitry, which shuts down the IC when

the output voltage is 40% above the normal

regulation voltage 4 consecutive switching cycles.

The ACT411 enters hiccup mode when an output

over voltage fault is detected.

VDD Over Voltage Protection

ACT411 can monitor the converter output voltage.

The voltage generated by the auxiliary winding

tracks converter’s output voltage through VDD,

which is in proportion to the turn ratio (VOUT+VDIODE)

хNA/NS. When the VOUT is abnormally higher than

design value for four consecutive cycles, IC will

enter the restart process. A counter is used to

reduce sensitivity to noise and prevent the auto

start unnecessary.

Open Loop Protection

ACT411 is able to protect itself from damage when

the control loop is open. The typical open loop

condition includes either VFB floating or RFB5

open.

Over Temperature Shutdown

The thermal shutdown circuitry detects the ACT411

die temperature. The threshold is set at typical

135˚C. When the die temperature rises above this

threshold (135˚C) the ACT411 is disabled and

remains disabled until the die temperature falls

below 115˚C, at which point the ACT411 is re-

enabled.

TYPICAL APPLICATION CONT’D

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