DatasheetsPDF.com

A3966 Dataheets PDF



Part Number A3966
Manufacturers Allegro MicroSystems
Logo Allegro MicroSystems
Description Dual Full-Bridge PWM Motor Driver
Datasheet A3966 DatasheetA3966 Datasheet (PDF)

A3966 Dual Full-Bridge PWM Motor Driver FEATURES AND BENEFITS ▪ ±650 mA continuous output current ▪ 30 V output voltage rating ▪ Internal fixed-frequency PWM current control ▪ Satlington® sink drivers ▪ User-selectable blanking window ▪ Internal ground-clamp and flyback diodes ▪ Internal thermal-shutdown circuitry ▪ Crossover-current protection and UVLO protection PACKAGE: 16-pin SOICW (suffix LB) Not to scale DESCRIPTION The A3966 is designed to drive both windings of a two-phase bipolar step.

  A3966   A3966



Document
A3966 Dual Full-Bridge PWM Motor Driver FEATURES AND BENEFITS ▪ ±650 mA continuous output current ▪ 30 V output voltage rating ▪ Internal fixed-frequency PWM current control ▪ Satlington® sink drivers ▪ User-selectable blanking window ▪ Internal ground-clamp and flyback diodes ▪ Internal thermal-shutdown circuitry ▪ Crossover-current protection and UVLO protection PACKAGE: 16-pin SOICW (suffix LB) Not to scale DESCRIPTION The A3966 is designed to drive both windings of a two-phase bipolar stepper motor. The device includes two full-bridges capable of continuous output currents of ±650 mA and operating voltages to 30 V. Motor winding current can be controlled by the internal fixed-frequency, pulse-width modulated (PWM), current-control circuitry. The peak load current limit is set by user selection of a reference voltage and current-sensing resistors. The fixed-frequency pulse duration is set by a user-selected external RC timing network. The capacitor in the RC timing network also determines a user-selectable blanking window that prevents false triggering of the PWM current-control circuitry during switching transitions. To reduce on-chip power dissipation, the full-bridge power outputs have been optimized for low saturation voltages. The sink drivers feature the Allegro™ patented Satlington® output structure. The Satlington outputs combine the low voltage drop of a saturated transistor and the high peak current capability of a Darlington. For each bridge, a PHASE input controls load-current polarity by selecting the appropriate source and sink driver pair. For each bridge, an ENABLE input, when held high, disables Continued on the next page… Typical Application 29319.25K, Rev. 13 MCO-0000728 PHASE 1 ENABLE1 +5 V 0.5 Ω +24 V 39 kΩ 47 µF + 1 16 2 V BB 15 3 14 4 LOGIC LOGIC 13 5 12 6 V BB 7 8 VREF 11 VCC 10 RC 9 PHASE 2 ENABLE2 0.5 Ω +5 V 10 kΩ Dwg. EP-047-4A 56 kΩ 680 pF October 25, 2021 A3966 Dual Full-Bridge PWM Motor Driver DESCRIPTION (CONTINUED) the output drivers. Special power-up sequencing is not required. Internal circuit protection includes thermal shutdown with hysteresis, ground-clamp and flyback diodes, and crossover-current protection. The A3966 is supplied in a 16-lead plastic wide SOIC with two pins internally fused to the die pad for enhanced thermal dissipation. These pins are at ground potential and need no electrical isolation. The device is lead (Pb) free, with 100% matte tin leadframe plating. SELECTION GUIDE Part Number A3966SLBTR–T Packing 1000 pieces / reel Ambient Temperature Range (°C) –20 to 85 ABSOLUTE MAXIMUM RATINGS Characteristic Symbol Load Supply Voltage VBB Logic Supply Voltage VCC Input Voltage VIN Sense Voltage VS Output Current* IOUT Package Power Dissipation Operating Ambient Temperature Maximum Junction Temperature Storage Temperature PD TA TJ(max) Tstg Notes Peak Continuous Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified current rating or TJ(max) TA = 25°C; per SEMI G42-88 Specification, Thermal Test Board Standardization for Measuring Junction-to-Ambient Thermal Resistance of Semiconductor Packages. Range S Rating 30 7.0 –0.3 to VCC + 0.3 1.0 ±750 ±650 1.87 –20 to 85 150 –55 to 150 Units V V V V mA mA W °C °C °C PINOUT DIAGRAM OUT1A 1 PHASE 1 2 ENABLE 1 3 GROUND 4 V BB LOGIC LOGIC 16 OUT2A 15 PHASE 2 14 ENABLE 2 13 GROUND SENSE1 5 OUT1B 6 LOAD SUPPLY 7 V BB REFERENCE 8 VREF 12 SENSE 2 11 OUT 2B VCC 10 LOGIC SUPPLY RC 9 RC Dwg. PP-066-1 2 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com A3966 Dual Full-Bridge PWM Motor Driver FUNCTIONAL BLOCK DIAGRAM OUT 2A OUT 2B + OUT 1A OUT1B PHASE 1 LOGIC SUPPLY V CC V BB LOAD SUPPLY CONTROL LOGIC1 UVLO & TSD ENABLE 1 RT SOURCE ENABLE 1 BLANKING PWM LATCH 1 GATE 1 R Q S CURRENT-SENSE COMPARATOR 1 + – RC CT OSC SENSE 1 R1S SENSE 2 R 2S CURRENT-SENSE COMPARATOR 2 + – BLANKING GATE 2 PWM LATCH 2 R Q S ÷4 REFERENCE CONTROL LOGIC2 SOURCE ENABLE 2 PHASE2 UVLO & TSD ENABLE 2 GROUND Dwg. FP-036-6 TRUTH TABLE PHASE X H L ENABLE H L L OUTA Off H L OUTB Off L H X = Irrelevant Typical output saturation voltages showing Satlington sink-driver operation. OUTPUT SATURATION VOLTAGE IN VOLTS 2.5 TA = +25°C 2.0 1.5 1.0 SOURCE DRIVER 0.5 SINK DRIVER 0 200 300 400 500 600 700 OUTPUT CURRENT IN MILLIAMPERES Dwg. GP-064-1A 3 Allegro MicroSystems 955 Perimeter Road Manchester, NH 03103-3353 U.S.A. www.allegromicro.com A3966 Dual Full-Bridge PWM Motor Driver EVSLE=C0TVR,IC56AkLŸC&HA6R80ACpFTERRCIStoTIGCrSoautnTdA(=un+l2e5sosCn, oVtBeBd=o3th0eVrw, VisCeC) = 4.75 V to 5.5 V, VREF = 2 V, Characteristic Output Drivers Symbol Test Conditions Min. Limits Typ. Max. Units Load Supply Voltage Range VBB Operating, IOUT = p650 mA.


A3962 A3966 A3967


@ 2014 :: Datasheetspdf.com :: Semiconductors datasheet search & download site.
(Privacy Policy & Contact)