ICE2AS01_06 Datasheet, PDF (14/24 Pages) Infineon Technologies AG – Off-Line SMPS Current Mode Controller

VCC
6.5V
C1
16.5V
R_Soft-Start
SoftS
4.0V
C2
Error Latch
G1
C_Soft-Start
T1
Power Up Reset
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 T_Soft-
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 140°C. In that case
the IC switches in Auto Restart Mode.
ICE2AS01/S01G
ICE2BS01/S01G
Functional Description
Note:
All the values which are mentioned in the
functional description are typical. Please refer
to Electrical Characteristics for min/max limit
values.
Datasheet
14
Preliminary Data
30 Jun 2006