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L6219DS Datasheet(PDF) 5 Page - Allegro MicroSystems |
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L6219DS Datasheet(HTML) 5 Page - Allegro MicroSystems |
5 / 8 page L6219DS DUAL FULL-BRIDGE MOTOR DRIVER LOGIC CONTROL OF OUTPUT CURRENT Two logic level inputs (l 0 and I1) allow digital selection of the motor winding current at 100%, 67%, 33%, or 0% of the maximum level per the table. The 0% output current condition turns off all drivers in the bridge and can be used as an OUTPUT ENABLE function. CURRENT-CONTROL TRUTH TABLE l 0 I 1 Output Current LL V REF /10 R S = I TRIP HL V REF /15 R S = 2/3 I TRIP LH V REF /30 R S = 1/3 I TRIP HH 0 These logic level inputs greatly enhance the implementation of µP-controlled drive formats. During half-step operations, the l 0 and l1 allow the µP to control the motor at a constant torque between all positions in an eight-step TYPICAL APPLICATION sequence. This is accomplished by digitally selecting 100% drive current when only one phase is on and 67% drive current when two phases are on. Logic highs on both l 0 and l1 turn off all drivers to allow rapid current decay when switching phases. This helps to ensure proper motor operation at high step rates. The logic control inputs can also be used to select a reduced current level (and reduced power dissipation) for ‘hold’ condi- tions and/or increased current (and available torque) for start-up conditions. GENERAL The PHASE input to each bridge determines the direction motor winding current flows. An internally generated deadtime (approximately 2 µs) prevents crossover currents that can occur when switching the PHASE input. All four drivers in the bridge output can be turned off between steps (l 0 = l1 ≥ 2.4 V) resulting in a fast current decay through the internal output clamp and flyback diodes. The fast current decay is desirable in half-step and high-speed applications. The PHASE, l 0,and I1 inputs float high. Varying the reference voltage (V REF) provides continuous control of the peak load current for microstepping applications. Thermal protection circuitry turns off all drivers when the junction temperature reaches +170 °C. It is only intended to protect the device from failures due to excessive junction temperature and should not imply that output short circuits are permitted. The output drivers are re-enabled when the junction temperature cools to +145 °C. The L6219DS output drivers are opti- mized for low output saturation voltages—less than 1.8 V total (source plus sink) at 500 mA. Under normal operating conditions, when combined with the excellent thermal proper- ties of the batwing package design, this allows continuous operation of both bridges simultaneously at 500 mA. FROM µP V REF Dwg. EP-008-2 V BB FROM µP V REF +5 V STEPPER MOTOR RS RS RC RC RT RT C T CT CC C C + 1 2 3 4 5 6 7 8 9 24 23 22 21 20 19 18 17 16 15 14 13 12 11 10 9 θ 2 θ 1 VCC 2 VBB 1 |
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