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2917 Folha de dados(PDF) 4 Page - Allegro MicroSystems |
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4 / 8 page 2917 DUAL FULL-BRIDGE PWM MOTOR DRIVER 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 + – 0 Dwg. WM-003-1A VPHASE I OUT td toff ITRIP APPLICATIONS INFORMATION PWM CURRENT CONTROL The UDN2917EB dual bridge is designed to drive both windings of a bipolar stepper motor. Output current is sensed and con- trolled independently in each bridge by an external sense resistor (RS), internal com- parator, and monostable multivibrator. When the bridge is turned on, current increases in the motor winding and it is sensed by the external sense resistor until the sense voltage (VSENSE) reaches the level set at the comparator’s input: ITRIP = VREF/10 RS The comparator then triggers the mon- ostable which turns off the source driver of the bridge. The actual load current peak will be slightly higher than the trip point (espe- cially for low-inductance loads) because of the internal logic and switching delays. This delay (td) is typically 2 µs. After turn-off, the motor current will normally decay, circulating through the ground clamp diode and sink transistor. The source driver’s off time (and therefore the magnitude of the current de- crease) is determined by the monostable’s external RC timing components, where toff = RTCT within the range of 20 k Ω to 100 kΩ and 200 pF to 500 pF. When the source driver is re-enabled, the winding current (the sense voltage) is again allowed to rise to the comparator’s threshold. This cycle repeats itself, maintaining the average motor winding current at the desired level. Special circuitry has been included to prevent runaway current control when the fixed off time (toff) is set too short. This circuitry prevents the source driver from being re-enabled until the load current has decayed to below the ITRIP level. PWM OUTPUT CURRENT WAVEFORM LOAD CURRENT PATHS Dwg. EP-006-1 R S BB V BRIDGE ON SOURCE OFF ALL OFF |
Nº de peça semelhante - 2917 |
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Descrição semelhante - 2917 |
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