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 HIGH SIDE DRIVER KIT FOR SMART JUNCTION BOXES Smart semiconductor switches are increasingly taking over the functions of power distributors, fuses and relays. Besides simply switching the load, they offer significantly more functionality than ordinary relays and power switches: short circuit protection, load diagnosis, load current data acquisition and load currents controlled by PWM, bringing higher reliability and extremely low space usage. According to the power to be switched, these devices are available as one, two, or four channel switches. As shown in the diagram opposite, the user has a choice of switches, depending on the requirement of either digital or analog diagnosis with load current data acquisition. For switching frontlights such as high beam, dipped and fog, ST offers a range of drivers. As a 15m½ switch, the VN920 is a single channel driver housed in PSO10 package or alternatively the dual driver VND920 in an SO28 plastic package. For applications where low power dissipation is required, the VN610 can be used to drive a 55W lamp with a maximum 400mW power dissipation. Its sense outputs delivers an accurate picture of the load currents, detects lamp failure, as well as non-allowable devices or manipulation of the circuits.  For lamps in the 5W to 27W range, two or four channel drivers, the VND600 and VNQ600 are available. Thanks to the current acquisition principle, several can be corrected and diagnosed in parallel - a very economical approach. The example and circuit suggestion shown in the diagram above has a total lamp power of 600W, with a maximum power dissipation of 5W. ST offers a range of driver types with different on-resistance and diagnostic concepts to suit a variety of applications. Moreover, ST's high side driver family not only drives lamps, but also inductive loads such as valves or motors and is thus suitable for many applications across the board.  |
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