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ICE2AS01 Datasheet(PDF) 14 Page - Infineon Technologies AG

Part No. ICE2AS01
Description  PWM-FF IC
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Maker  INFINEON [Infineon Technologies AG]
Homepage  http://www.infineon.com
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 14 page
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Version 2.0
14
1 Feb 2002
ICE2AS01/G
ICE2BS01/G
Functional Description
Figure 22
Overvoltage Detection
The overvoltage detection is provided by Comparator
C1 only in the first time during the Auto Restart Mode
till the Soft-Start voltage exceeds the threshold of the
Comparator C2 at 4.0V and the voltage at pin FB is
above 4.8V. When VCC exceeds 16.5V during the
overvoltage detection phase C1 can set the Error-Latch
and the Burst Phase during Auto Restart Mode is
finished earlier. In that case T
Burst2 is shorter than TSoft-
Start . By means of C2 the normal operation mode is
prevented from overvoltage detection due to varying of
VCC concerning the regulation of the converter output.
When the voltage V
SoftS is above 4.0V the overvoltage
detection by C1 is deactivated.
3.8.3
Thermal Shut Down
Thermal Shut Down is latched by the Error-Latch when
junction temperature T
j
of the pwm controller is
exceeding an internal threshold of 140Ā°C. In that case
the IC switches in Auto Restart Mode.
Note:
All the values which are mentioned in the
functional description are typical. Please refer
to Electrical Characteristics for min/max limit
values.
6.5V
C
So ft-S ta rt
VC C
R
S o ft-S ta rt
C1
16.5V
C2
4.0V
T1
So ftS
G1
E rror Latch
P o w e r Up Re se t




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