ICLS6022G Infineon Technologies, ICLS6022G Datasheet - Page 23

• Manufacturer Part Number: ICLS6022G
• Manufacturer: Infineon Technologies

Specifications of ICLS6022G

• Packages: PG-DSO-12
• Vds: 650V
• Rds (on): 4,70

The other fault detection function which can result in the Auto Restart mode during startup and has the 8.0 µs
blanking time is for overtemperature detection. This block checks for a junction temperature of higher than 140 °C
for malfunctioning operation.
Once Auto Restart mode is entered, the internal bias is switched off in order to reduce the current consumption of
the IC as much as possible. In this mode, the average current consumption is only 300 µA as the only working
blocks are the reference block and the Undervoltage Lockout (UVLO), which controls the startup cell by switching
on/off at V
As there is no longer a self supply provided by the auxiliary winding, VCC starts to drop. The UVLO switches on
the integrated startup cell when VCC falls below 10.3 V. It continues to charge VCC up to 18 V, at which point it
is switched off again and the IC enters the startup phase.
Once all fault conditions have been removed, the IC automatically powers up as usual with a switching cycle at
the GATE output after the soft start period has elapsed – hence the name Auto Restart mode.
3.6.2.2
In the case of overload or open loop, the FB voltage exceeds 4.5 V, which is observed by C4. At this time, the
external soft start capacitor can then be further charged by the integrated pull-up resistor R
(see
activated as both inputs of the gate G5 are high.
Figure 17
This charging of the soft start capacitor from 3.2 V ~ 3.6 V to 4.0 V defines a blanking window, which prevents the
system from entering Auto Restart mode during RUN mode unintentionally during large load jumps. In this event,
FB will rise close to 5.0 V for a short duration before the loop regulates FB to less than 4.5 V.
In the case of VCC undervoltage – i.e., VCC falls below 10.3 V, the IC is turned off with the startup cell charging
VCC as described earlier in this section. Once VCC is charged to above 18 V, the IC starts a new startup cycle.
This blanking time window for the Floating Load Protection mode can be forced via the external C
3.6.2.3
The circuit starts up as usual, but a missing load leads to a rise in the output and auxiliary voltages.
Reaching the VCC threshold of 24.5 V (voltage divider RD2/R4 and Q2) leads to a reduction in the feedback
voltage and hence to reduced output current pulses in order to keep the output voltage below the maximum rating
of the components. If the feedback level falls below 1.35 V, the Soft Start voltage begins to rise up to a threshold
of 4 V (depends on the C4 value) and the IC is switched into the FLP mode.
Data Sheet
Figure
VCCon
Auto Restart Mode during RUN Mode
15). If V
Auto Restart mode during RUN mode
Floating Load Protection (FLP)
/V
VCCoff
SoftS
.
exceeds 4.0 V, which is observed by C3, Auto Restart mode during RUN mode is
SoftS
4.0V
4.5V
FB
C3
C4
23
G5
&
Control Unit
Internal
Restart
Mode
Auto
Bias
LED System Driver ICs
Functional Description
Version 1.0, 2011-05-19
SoftS
ICLS6x Series
via the switch S3
SoftS
capacitor.