AS8401

Austria Mikro Systeme International AG AS8401 Multipurpose control ASIC for OMNIFET Data Sheet Multipurpose control ASIC for OMNINET – Data Sheet AS8401 Austria Mikro Systeme International AG Key Features Multipurpose control ASIC for OMNIFET (SGS Thompson intelligent power FET family) Contains one channel on-chip Applicable in low or high side switch circuits Supply voltage range 10V – 60V Up to +/- 3V potential difference between system’ s digital ground and power ground possible. Current controlled interface Provides load circuit surveillance and fault back signal Typical rise time shorter then 2.4us Typical fall time shorter then 3.8us 8 pin SOIC Package General Description The ASIC’ s purpose is to drive one OMNIFET n-channel power FET device. (OMNIFET is a trademark of SGS-THOMSON). The OMNIFET’ s integrated protection circuits (current limitation, over temperature protection, ...) are supplied via the OMNIFET’ s gate input. Thus in the OMNIFET’ s on-state, a DC gate current of 0.5mA is required. In a failure case (e.g. excessive temperature) an internal resistor of about 100Ω is connected between the OMNIFET’ s gate and source. This state is used to detect errors by the controlling ASIC. The control ASIC’ s standard application is in the use as a high side or low side switch (selectable) in a 24V-supply system, where the functionality is guaranteed up to a maximum driver voltage of 55V. In the load dump case (VTR = 60V, Pulse duration about 5ms...