Datenblatt-Suchmaschine für elektronische Bauteile |
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TLE4726G Datenblatt(PDF) 21 Page - Infineon Technologies AG |
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TLE4726G Datenblatt(HTML) 21 Page - Infineon Technologies AG |
21 / 23 page TLE 4726 Data Sheet 21 1999-09-15 Application Hints The TLE 4726 is intended to drive both phases of a stepper motor. Special care has been taken to provide high efficiency, robustness and to minimize external components. Power Supply The TLE 4726 will work with supply voltages ranging from 5 V to 50 V at pin V S. As the circuit operates with chopper regulation of the current, interference generation problems can arise in some applications. Therefore the power supply should be decoupled by a 0.22 µF ceramic capacitor located near the package. Unstabilized supplies may even afford higher capacities. Current Sensing The current in the windings of the stepper motor is sensed by the voltage drop across R 1 and R 2. Depending on the selected current internal comparators will turn off the sink transistor as soon as the voltage drop reaches certain thresholds (typical 0 V, 0.25 V, 0.5 V and 0.75 V); ( R 1 , R2 =1 Ω). These thresholds are neither affected by variations of V L nor by variations of VS. Due to chopper control fast current rises (up to 10 A/ µs) will occur at the sensing resistors R 1 and R2 . To prevent malfunction of the current sensing mechanism R1 and R 2 should be pure ohmic. The resistors should be wired to GND as directly as possible. Capacitive loads such as long cables (with high wire to wire capacity) to the motor should be avoided for the same reason. Synchronizing Several Choppers In some applications synchrone chopping of several stepper motor drivers may be desireable to reduce acoustic interference. This can be done by forcing the oscillator of the TLE 4726 by a pulse generator overdriving the oscillator loading currents (approximately ± 100 µA). In these applications low level should be between 0 V and 1 V while high level should be between 2.6 V and V L . Optimizing Noise Immunity Unused inputs should always be wired to proper voltage levels in order to obtain highest possible noise immunity. To prevent crossconduction of the output stages the TLE 4726 uses a special break before make timing of the power transistors. This timing circuit can be triggered by short glitches (some hundred nanoseconds) at the Phase inputs causing the output stage to become high resistive during some microseconds. This will lead to a fast current decay during that time. To achieve maximum current accuracy such glitches at the Phase inputs should be avoided by proper control signals. |
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