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ICE3B2065J Datasheet(PDF) 14 Page - Infineon Technologies AG |
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ICE3B2065J Datasheet(HTML) 14 Page - Infineon Technologies AG |
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14 / 28 page  CoolSET®-F3R ICE3Bxx65J Version 2.7 14 9 May 2012 small voltage overshoots of V VCC during normal operating cannot trigger the Auto Restart Mode I. In Order to ensure system reliability and prevent any false activation, a blanking time is implemented before the IC can enter into the Auto Restart Mode I. The output of the VCC overvoltage detection is fed into a spike blanking with a time constant of 8.0us. The other fault detection which can result in the Auto Restart Mode I and has this 8.0us blanking time is the Overtemperature detection. This block checks for a junction temperature of higher than 140°C for malfunction operation. Once Auto Restart Mode is entered, the internal bias is switched off in order to reduce the current consumption of the IC as much as possible. In this mode, the average current consumption is only 300uA as the only working blocks are the reference block and the Undervoltage Lockout(UVLO) which controls the Startup Cell by switching on/off at V VCCon/VVCCoff. As there is no longer a self supply by the auxiliary winding, VCC starts to drop. The UVLO switches on the integrated Startup Cell when VCC falls below 10.3V. It will continue to charge VCC up to 18V whereby it is switched off again and the IC enters into the Start Up Phase. As long as all fault conditions have been removed, the IC will automatically power up as usual with switching cycle at the GATE output after Soft Start duration. Thus the name Auto Restart Mode. 3.6.3.2 Auto Restart Mode II Figure 17 Auto Restart Mode II In case of Overload or Open Loop, FB exceeds 4.5V which will be observed by C4. At this time, the external Soft Start capacitor can now be charged further by the integrated pull up resistor R SoftS via switch S3 (see Figure 13). If V SoftS exceeds 4.0V which is observed by C3, Auto Restart Mode II is entered as both inputs of the gate G5 are high. This charging of the Soft Start capacitor from 3.2V~3.6V to 4.0V defines a blanking window which prevents the system from entering into Auto Restart Mode II unintentionally during large load jumps. In this event, FB will rise close to 5.0V for a short duration before the loop regulates with FB less than 4.5V. This is the same blanking time window as for the Active Burst Mode and can therefore be adjusted by the external C SoftS. In case of VCC undervoltage, ie. VCC falls below 10.3V, the IC will be turned off with the Startup Cell charging VCC as described earlier in this section. Once VCC is charged above 18V, the IC will start a new startup cycle. The same procedure applies when the system is under Short Optocoupler fault condition, as it will lead to VCC undervoltage. C3 4.0V C4 4.5V & G5 Control Unit SoftS Internal Bias Auto Restart Mode FB |
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