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ICE2AS01 Datasheet(PDF) 14 Page - Infineon Technologies AG |
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ICE2AS01 Datasheet(HTML) 14 Page - Infineon Technologies AG |
14 / 24 page 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 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 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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