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ICE2A0565 Arkusz danych(PDF) 16 Page - Infineon Technologies AG |
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ICE2A0565 Arkusz danych(HTML) 16 Page - Infineon Technologies AG |
16 / 36 page Version 2.6 16 25 Dec 2006 CoolSET™-F2 Functional Description But the Soft-Start Phase must be finished within the Start Up Phase to force the voltage at pin FB below the failure detection threshold of 4.8V. 3.8.2 Overvoltage due to Open Loop with No Load Figure 23 Auto Restart Mode Figure 23 shows the Auto Restart Mode for open loop and no load condition. In case of this failure mode the converter output voltage increases and also VCC. An additional protection by the comparators C1, C2 and the AND-gate G1 is implemented to consider this failure mode (see Figure 24).The overvoltage detection is provided by Comparator C1 only in the first time during the Soft-Start Phase 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. Figure 24 Overvoltage Detection 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. Open loop & no load condition t Driver 13.5V 16.5V FB 4.8V 5µs Blanking Failure Detection 5.3V SoftS 4.0V Overvoltage Detection Phase Soft-Start Phase t t T Restart T Burst2 VCC 8.5V Overvoltage Detection t 6.5V C Soft-Start VCC R Soft-Start C1 16.5V C2 4.0V T1 SoftS G1 Error Latch Power Up Reset |
Podobny numer części - ICE2A0565 |
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Podobny opis - ICE2A0565 |
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