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STMicro motor driver targets automotive apps

Posted: 24 May 2004 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? vnh3sp30? motor driver?

STMicroelectronics has introduced an H bridge in a single package for high-power automotive applications such as driving window lifts, seat positioners and for dc motor control.

Packaged to save customers board space, weight and costs, the VNH3SP30 is a full-bridge motor driver intended for a wide range of automotive applications. Its features an output current of 30A, maximum operating voltage of 40V, and a maximum R((DS)(on)) of 45milliohm per leg, for low operating losses. The control inputs are compatible with 5V logic levels and the device will support pulse width-modulated operation at up to 10KHz.

The company said that the motor driver is extensively protected against a variety of mishaps, including under- and over-voltages, and the loss of ground or VCC potentials. Other protection mechanisms include an over-voltage clamp, a thermal shutdown circuit, cross-conduction protection and a linear current limiter.

HSD, two low-side switches

The VNH3SP30 is built around a dual monolithic high-side driver (HSD) and two low-side switches. The low-side switches are vertical MOSFETs manufactured using STMicro's proprietary EHD (STripFET) process, while the HSD switch is designed using the company's VIPower M0 technology that allows the efficient integration on one die of a power MOSFET with intelligent signal/protection circuitry.

The three dice are assembled in a surface-mount MultiPowerSO-30 package on electrically isolated leadframes. Two input signals, In(A) and In(B), can interface directly to a microcontroller to select the motor direction or a brake condition. Two diagnostic/enable pins allow the user to select one leg of the bridge and also to feed back a digital diagnostic signal. Pricing is $2.50 in quantities of 1,000-units.

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