2AS01 datasheet(14/24 Pages) INFINEON

14 / 24 page

Datasheet

30 Jun 2006

Preliminary Data

ICE2AS01/S01G

ICE2BS01/S01G

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 TBurst2 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 VSoftS 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 Tj of the pwm controller is

exceeding an internal threshold of 140°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

Soft-Start

VCC

Soft-Start

16.5V

4.0V

SoftS

Error Latch

Power Up Reset

2AS01 Datasheet(PDF) 14 Page - Infineon Technologies AG