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Zakładka z wyszukiwarką danych komponentów |
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Zakładka z wyszukiwarką danych komponentów |
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ICE2AS01 Arkusz danych(PDF) 12 Page - Infineon Technologies AG |
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ICE2AS01 Arkusz danych(HTML) 12 Page - Infineon Technologies AG |
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12 / 24 page  Version 2.0 12 1 Feb 2002 ICE2AS01/G ICE2BS01/G Functional Description transistors as well as to protect them against undesirable gate overvoltages. Figure 17 Gate Driver At voltages below the undervoltage lockout threshold V VCCoff the gate drive is active low. The driver-stage is optimized to minimize EMI and to provide high circuit efficiency. This is done by reducing the switch on slope when reaching the external Power Switch threshold. This is achieved by a slope control of the rising edge at the driver’s output (see Figure 18). Figure 18 Gate Rising Slope Thus the leading switch on spike is minimized. When the external Power Switch is switched off, the falling shape of the driver is slowed down when reaching 2V to prevent an overshoot below ground. Furthermore the driver circuit is designed to eliminate cross conduction of the output stage. 3.8 Protection Unit (Auto Restart Mode) An overload, open loop and overvoltage detection is integrated within the Protection Unit. These three failure modes are latched by an Error-Latch. Additional thermal shutdown is latched by the Error-Latch. In case of those failure modes the Error-Latch is set after a blanking time of 5µs and the external Power Switch is shut down. That blanking prevents the Error-Latch from distortions caused by spikes during operation mode. 3.8.1 Overload & Open loop with normal load Figure 19 Auto Restart Mode Figure 19 shows the Auto Restart Mode in case of overload or open loop with normal load. The detection of open loop or overload is provided by the Comparator C3, C4 and the AND-gate G2 (see Figure20). Z1 VC C 1 PW M -L a tch Ga te t V Ga te 5V C Load = 1 n F ca. t = 130n s O ve rloa d & O p en lo op/no rm a l lo ad FB t 4.8V 5.3V So ftS 5µ s B la n king F a ilu re De te c tio n S o ft-S ta rt P h a s e VC C 13 .5V 8.5 V t Driv e r t T Re s tart T Bu rs t1 t |
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