TLC5960DA datasheet(17/33 Pages) TI

17 / 33 page

CTRL1

Internal

CLK

XFLT

DET

DET1

DET2

DET1

DET2

DET1

LED

Open

Recovery

LEDRemainsOff

whenProtected

XFLTErrorNotification

LOD,LSD,FODCheck

LEDOnwithNoErrorOutputs

LOD,LSD,FODCheck

LEDOnwithNoErrorOutputs

LEDOpenDetected

ErrorStatus

Release

TLC5960

www.ti.com

SBVS147 – SEPTEMBER 2010

FAILURE MODE DETECTION AND RELEASE TIMING

When the FET is on, the TLC5960 protects the system by monitoring the triggers of the LOD, LSD, and FOD

detectors. After the LED channel is on (EN = CTRLn = high), the TLC5960 waits for a detection time of tDET1

before capturing the drain and source node information on the external FETs.

In case the error comparator(s) detect an abnormal status, the TLC5960 starts to determine whether this state is

a true error condition or not. If the status is determined as an error in system with a processing time of tDET2, the

TLC5960 shuts off the corresponding channel(s), separates it from the operating channels, and the XFLT

notification sequence is started.

After the abnormal situation is recovered, toggling of the EN pin (high-to-low-to-high) reverts the TLC5960 to the

default operating status. Otherwise, the device remains in the error status until VIN is less than VPOR. The

detection time (tDET1) and error processing time (tDET2) are both set to 13µs. Figure 20 shows the case of CTRL1,

D1, and D2.

Figure 20. LOD, LSD, and FOD Detection and Error Status Release

Submit Documentation Feedback

Product Folder Link(s): TLC5960

TLC5960DA Datasheet(PDF) 17 Page - Texas Instruments