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TLE6284G Datasheet(PDF) 9 Page - Infineon Technologies AG |
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TLE6284G Datasheet(HTML) 9 Page - Infineon Technologies AG |
9 / 17 page Data Sheet TLE6284G Data Sheet 9 Rev 2.4 2008-03-18 output stage the ER1 is pulled down. This shut down can be caused by undervoltage or short circuit. In this condition ER2 indicates the reason for the shut down. Condition of ER1 pin Condition of ER2 pin Function 5V 5V no errors 5V 0V overtemperature warning of driver IC 0V 5V Shut down of any output stage caused by short circuit 0V 0V Shut down of any output stage caused by undervoltage Recommended Start-up procedure The following procedure is recommended whenever the Driver IC is powered up: • Disable the Driver IC via DT/DIS pin • Wait until the bootstrap capacitors of High Side MOSFET CBx are charged (the waiting time depends on application conditions, e.g. CBx and RBx) • Enable the Driver IC via DT/DIS pin • Start the operation by applying the desired pulse patterns. Do not apply any pulse pat- terns to the PWM or DIR pin, before the CBx capacitors are charged up. Short Circuit protection The current threshold limit to activate the Short Circuit protection function can be adjusted to larger values, it can not be adjusted to lower values. This can be done by external resistors to form voltage dividers across the “sense element” (pls. see Application block diagram on pg. 2), consisting of the Drain-Source-Terminals, a fraction of the PCB trace and – in some cases – current sense resistors (used by the µC not by the Driver IC). The Short Circuit protection can be disabled for the High Side MOSFETs by shorting DH1 with SH1 and DH2 with SH2 on the PCB; in this case the DHx pins may not be connected to the Drains of the associated MOSFETs. To disable Short Circuit protection for the Low Side MOSFETs the DL1 and DL2 pin should be connected to the Driver IC´s Ground. Shut down of the driver A shut down can be caused by undervoltage or short circuit. A short circuit will shut down only the affected Mosfet until a reset of the error register by a disable of the driver occurs. A shut down due to short circuit will occur only when the Short Circuit criteria VDS(SCP) is met for a duration equal to or longer than the Short Circuit filter time tSCP(off). Yet, the exposure to or above VDS(SCP) is not counted or accumulated. Hence, repeti- tive Short Circuit conditions shorter than tscp(off) will not result in a shut down of the affected MOSFET. An undervoltage shut down shuts only the affected output down. The affected output will auto restart after the undervoltage situation is over. Operation at Vs<12V If Vs<11.5V the gate voltage will not reach 10V. It will reach approx Vs-1.5V, dependent on duty cyle, bootstrap capacitor, total gate charge of the external Mosfet and switching fre- quency. |
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Similar Description - TLE6284G_08 |
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