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SLA7051M Fiches technique(PDF) 6 Page - Allegro MicroSystems |
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SLA7051M Fiches technique(HTML) 6 Page - Allegro MicroSystems |
6 / 12 page 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 SLA7051M UNIPOLAR STEPPER-MOTOR TRANSLATOR/PWM DRIVER 6 Motor Driver Applications information Layout. The printed wirting board should use a heavy ground plane. For optimum electrical and thermal performance, the driver should be soldered directly into the board. The driver supply terminal, VBB, should be decoupled with an electrolytic capacitor placed as close to the device as possible. To avoid problems due to capacitive coupling of the high dv/dt switching transients, route the high-level, output traces away from the sensitive, low-level logic traces. Always drive the logic inputs with a low source impedance to increase noise immunity. Grounding. A star ground system located close to the driver is recommended. The logic supply return and the driver supply return should be connected together at only a single point — the star ground. Logic supply voltage, V DD. Transients at this terminal should be held to less than 0.5 V to avoid malfunctioning operation. Both V BB and VDD may be turned on or off separately. Logic inputs. Unused logic inputs (CW/CCW, FULL/ HALF, or SYNC) must be connected to either ground or the logic supply voltage. Current sensing. To minimize inaccuracies caused by ground-trace IR drops in sensing the output current level, the current-sense resistor, R S, should have an independent ground return to the star ground of the device. This path should be as short as possible. For low-value sense resistors, the IR drops in the printed wiring board sense resistor’s traces can be significant and should be taken into account. The use of sockets should be avoided as they can introduce variation in R S due to their contact resistance. PWM current control. The maximum value of current limiting (I TRIP) is set by the selection of RS and the voltage at the REF input with a transconductance function approxi- mated by: I TRIP = VREF/RS The required V REF should not be less than 0.1 V. If it is, R S should be increased for a proportionate increase in V REF. Typical application |
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