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UDN2961W Datasheet(PDF) 4 Page - Allegro MicroSystems |
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UDN2961W Datasheet(HTML) 4 Page - Allegro MicroSystems |
4 / 12 page 2961 HIGH-CURRENT HALF-BRIDGE PRINTHEAD/MOTOR DRIVER 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 BB V V SENSE + - REF CIRCUIT BB V Dwg. EP-037 DRIVE CURRENT RECIRCULATION (SLOW-DECAY MODE) RECIRCULATION (FAST-DECAY MODE) APPLICATIONS INFORMATION The UDN2961B/W is a high current half-bridge designed to drive a number of inductive loads such as printer solenoids, stepper motors, and dc motors. Load current is sensed internally and is controlled by pulse-width modulating (PWM) the output driver(s) in a fixed off-time, variable- frequency format. The peak current level is set by the user’s selection of a reference voltage. A slow current-decay mode (chopping only the source driver) or a fast current-decay mode (chopping both the source and sink drivers) can be selected via the MODE pin. PWM CURRENT CONTROL A logic low on the MODE pin sets the current-control circuitry into the slow-decay mode. The RS flip-flop is set initially, and both the source driver and the sink driver are turned ON when the INPUT pin is at a logic low. As current in the load increases, it is sensed by the internal sense resistor until the sense voltage equals the trip voltage of the comparator. At this time, the flip-flop is reset and the source driver is turned OFF. Over the range of VREF = 0.8 V to 3.4 V, the output current trip point transfer function is a direct linear function of the reference voltage: ITRIP = VREF To ensure an accurate chop current level ( ±10%), an external 2940 Ω ±1% resistor (RCV) is used. The actual load current peak will be slightly higher than the trip point (especially for low-inductance loads) because of the internal logic and switching delays (typically 1.5 µs). After the source driver turns OFF, the load current decays, circulating through an external ground clamp diode, the load, and the sink transistor. The source driver’s OFF time (and therefore the magni- tude of the current decrease) is determined by the one-shot’s external RC timing compo- nents: tOFF = RC within the range of 20 k Ω to 100 kΩ and 100 pF to 1000 pF. When the one-shot times out, the flip-flop is set again, the source driver is re- enabled, and the load current again is allowed to rise to the set peak value and trip the comparator. This cycle repeats itself, maintaining the average load current at the desired level. ENABLE INPUT MODE LOAD CURRENT RC RC/2 I TRIP Dwg. WP-015 |
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