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Motor Control with Automotive Smart Power Slide 14

Shown on this slide is the internal block diagram and an example of L99H01 implementation into a system. It can be seen that this architecture provides a high level of application flexibility, configuration control, diagnostics, and protections that give the L99H01 key advantages as application architectures are considered. The 5 V/3.3 V compatibility of the logic interface supports all 8-bit and 32-bit microcontrollers with SPI. Because the current sense capability of the L99H01 allows accurate detection of stall it is ideally suited for applications involving motors that drive bi-directional hydraulic solenoids. Many new parking brake applications are a good example. The illustration on the top right shows how the use of programmable active freewheeling can significantly reduce the power dissipation by distributing the freewheeling energy resulting from PWM mode operation among the four H-Bridge transistors. turn on MOSFETs in parallel with their body diode during a freewheeling event. The system watchdog interface, sleep mode, and wake-up detection features of the L99H01 make it well suited for mechatronic applications that co-locate the electronics control with the DC motor and can be distributed to more remote areas of a larger system. For example in automotive applications, motor driven tailgates are becoming more and more popular. In these applications multiple DC motors are present and need to be synchronized to balance the tailgate. Another example with synchronization requirements would be windshield wipers where the L99H01 can be used to sense the position of the two wipers and enable the microcontroller to balance the left and right wipers. Other applications may include safety systems, like automatic seat belt tensioners, where, under critical driving conditions, the pre-safe system tightens the seat belt by driving the DC motor into current-controlled mode. The L99H01 current-sense amplifier delivers the current to the microcontroller ADC input which allows the proper torque to be established.

PTM Published on: 2012-11-06
PTM Updated on: 2015-03-19