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UDN2543 Datasheet(PDF) 4 Page - Allegro MicroSystems |
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UDN2543 Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 8 page 2543 PROTECTED QUAD POWER DRIVER 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 TYPICAL OUTPUT BEHAVIOR CIRCUIT DESCRIPTION AND APPLICATION INCANDESCENT LAMP DRIVER For incandescent lamp applications, the UDx2549B/EB or UDx2559B/EB, with improved shortcircuit protection and thermal limiting, are recommended. INDUCTIVE LOAD DRIVER Bifilar (unipolar) stepper motors, relays, or solenoids can be driven directly. The internal flyback diodes prevent damage to the output transistors by suppressing the high-voltage spikes that occur when turning OFF an inductive load. For rapid current decay (fast turn-OFF speeds), the use of Zener diodes will raise the flyback voltage and improve performance. However, the peak voltage must not exceed the specified minimum sustaining voltage (VSUPPLY + VZ + VF ≤ V OUT(SUS)). FAULT CONDITIONS In the event of a shorted load, the load current will attempt to increase. As described above, the drive current to the affected output stage is diverted, causing the output stage to go linear, limiting the peak output current to approximately 1 A. As the power dissipation of that output stage increases, a thermal gradient sensing circuit will become operational, further decreasing the drive current to the af- fected output stage and reducing the output current to a value depen- dent on supply voltage (IOUT ≈ 2.4/V SUPPLY). If the fault condition is corrected, the output stage will return to its normal saturated condition. Due to the independent operation of the four channels, only a single channel should be shorted at a time. Multiple overload conditions may be tolerated provided rated package power dissipation is not exceeded. NORMAL LOAD TIME Dwg. WP-013-1 NOT TO SCALE CURRENT LIMIT (12 V SUPPLY) SHORT CIRCUIT CURRENT LIMIT (24 V SUPPLY) |
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