ICLS602X datasheet(22/33 Pages) INFINEON

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LED System Driver ICs

ICLS6x Series

Functional Description

Data Sheet

Version 1.0, 2011-05-19

3.6.2

Protection Modes

The IC provides several protection features to increase the LED drive’s robustness and safety. The following table

shows the possible system failures and the corresponding protection modes.

3.6.2.1

Auto Restart Mode during Startup

The VCC voltage is observed by the comparator C13 if 20.5 V is exceeded. The output of C13 is combined with

both the output of C3, which checks for VSoftS < 4.0 V, and the output of C4, which checks for VFB > 4.5 V.

Therefore, overvoltage detection can only be active during the soft start phase (VSoftS < 4.0 V) and if the FB signal

is outside the operating range (> 4.5 V). This means any small voltage overshoots of VVCC occurring during normal

operation cannot trigger the Auto Restart mode during startup.

Figure 16

Auto Restart mode during startup

In order to ensure system reliability and prevent any false activation, a blanking time is implemented before the IC

can enter Auto Restart mode during startup. The output of the VCC overvoltage detection circuit is fed into a spike

blanking with a time constant of 8.0 µs.

Table 3

Protection modes

VCC Overvoltage

Auto Restart mode during startup

Overtemperature

Auto Restart mode during RUN mode

Overload

Auto Restart mode during RUN mode

Open Loop

Auto Restart mode during RUN mode

VCC Undervoltage

Auto Restart mode during RUN mode

Floating Load Protection (FLP)

Floating Load Protection mode

Spike

Blanking

8.0us

Thermal Shutdown

Tj >140°C

Auto

Restart

Mode

Internal

Bias

Control Unit

C13

20.5V

VCC

4.5V

4.0V

SoftS

G12

G13

FF2

UVLO

ICLS602X Datasheet(PDF) 22 Page - Infineon Technologies AG

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