ACT512

Rev 4, 13-Feb-14

- 7 -

www.active-semi.com

Copyright © 2014 Active-Semi, Inc.

Active-Semi Proprietary―For Authorized Recipients and Customers

ActiveQR

Figure 3:

Valley Switching

Protection Features

The ACT512 provides full protection functions. The

following table summarizes all protection functions.

Auto-Restart Operation

ACT512 will enter into auto-restart mode when a

fault is identified. There is a startup phase in the

auto-restart mode. After this startup phase the

conditions are checked whether the failure is still

present. Normal operation proceeds once the

failure mode is removed. Otherwise, new startup

phase will be initiated again.

To reduce the power loss during fault mode, the

startup delay control is implemented. The startup

delay time increases over lines.

FUNCTIONAL DESCRIPTION CONT’D

PROTECTION

FUNCTIONS

FAILURE

CONDITION

PROTECTION

MODE

(4 duty cycle)

Auto Restart

age/No Voltage

No switching

for 4 cycles

Auto Restart

Over Temperature

T > 135˚C

Auto Restart

Short Winding/

Short Diode

Auto Restart

Over Load/Open

Loop

for 320ms

Auto Restart

Output Short

Circuit

Auto Restart

age

Auto Restart

Vdrain_gnd

t

DCvoltage

T

Ton

Possible Valley turn on

V