ACT412

Rev 1, 30-Oct-13

- 9 -

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enter the restart process. A counter is used to

reduce sensitivity to noise and prevent the auto

start unnecessary.

Open Loop Protection

ACT412 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 ACT412

die temperature. The threshold is set at typical

135˚C. When the die temperature rises above this

threshold (135˚C) the ACT412 is disabled and

remains disabled until the die temperature falls

below 115˚C, at which point the ACT412 is re-

enabled.

TYPICAL APPLICATION CONT’D