A2918SWV

2918 OUT1A OUT2A E2 OUT2B LOAD SPLY SENSE 2 1 2 3 4 5 6 7 8 9 DUAL FULL-BRIDGE PWM MOTOR DRIVER The A2918SWH and A2918SWV motor drivers are designed to drive both windings of a bipolar stepper motor or bidirectionally control two dc motors. All bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 1.5 A. For PWM current control, the maximum output current is determined by the user’s selection of a reference voltage and sensing resistor. A PHASE input to each bridge determines load current direction. Active low ENABLE inputs control the four drivers in each bridge. The bridges include both ground clamp and flyback diodes for protection against inductive transients. Internally generated delays prevent cross-over currents when switching current direction. Special power-up sequencing is not required. Thermal protection circuitry disables the outputs if the chip temperature exceeds safe operating limits. 2 ENABLE2 PHASE2 RC2 GROUND LOGIC SPLY REFERENCE ABSOLUTE MAXIMUM RATINGS at TJ ≤ +150°C Motor Supply Voltage, VBB . . . . . . . . . 45 V Output Current, IOUT (tw≤20 µs) . . ±1.75 A (Continuous) . . . . . . . . . . . . . . ±1.5 A Logic Supply Voltage, VCC . . . . . . . . . 7.0 V Logic Input Voltage Range, VIN . . . . . . . . . . . . . . . -0.3 V to +7.0 V Output Emitter Voltage, VE . . . . . . . . . 1.5 V Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . See Graph Operating Temperature Range, TA . . . . . . . . . . . . . . . . -20°C to +85°C Storage Temperature Range, TS . . . . . . . . . . . . . . . -40°C to +150°C Output current rating may be limited by duty cycle, ambient temperature, and heat sinking. Under any set of conditions, do not exceed the specified peak current rating or a junction temperature of +150°C. T C. U LY DN O O gn R si P E de D NC w EE e U R rn IN E fo TFB NEE O R 17 C R 29 IS O N D F UD — Use PWM 2 VBB Data Sheet 29319.24A 10 11 12 1 VCC RC1 PHASE1 13 14 15 16 17 18 PWM 1 ENABLE1 VREF TSD SENSE1 OUT1B E1 Dwg. PP-051 The A2918SWH/V are supplied in an 18-lead power-tab package with staggered lead forming. The tab is internally insulated from the device and requires no external isolation. The A2918SWH/V are available for operation from -40°C to +85°C. To order, change the suffix from 'S–' to 'E–'. These devices are also available on special order for operation to +125°C. FEATURES I I I I I I I ± 1.5 A Continuous Output Current 45 V Output Sustaining Voltage Internal PWM Current Control Low Output Saturation Voltage Internal Clamp Diodes Internal Thermal Shutdown Circuitry Similar to Dual PBL3718 or Dual PBL3770 Always order by complete part number: Part Number A2918SWH A2918SWV Application For Horizontal Mount For Vertical Mount 2918 DUAL FULL-BRIDGE PWM MOTOR DRIVER FUNCTIONAL BLOCK DIAGRAM LOGIC SUPPLY OUT 1B LOAD SUPPLY OUT 2A OUT 1A OUT 2B 11 VCC 1 17 5 2 4 TSD VBB PWM 1 1 2 PWM 2 PHASE 1 13 8 PHASE 2 ENABLE1 14 7 ENABLE2 SOURCE DISABLE – + ÷10 VREF ÷10 – + SOURCE DISABLE ONE SHOT ONE SHOT SENSE 1 SENSE 2 E1 E2 RC1 RT CT CC RS REFERENCE GROUND RC RS RC2 RT Dwg. FP-033 12 16 R 18 C 15 10 3 6 9 CC CT 10 ALLOWABLE PACKAGE POWER DISSIPATION IN WATTS 8 R θJT /W °C =9 6 TRUTH TABLE Enable L L H Phase H L X OutA H L Z OutB L H Z 4 R θJA 2 =2 8°C /W X = Don’t care Z = High impedance 0 25 50 75 100 TEMPERATURE IN °C 125 150 Dwg. GP-043 115 Northeast Cutoff, Box 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 W Copyright © 1991, 1993, Allegro MicroSystems, Inc. 2918 DUAL FULL-BRIDGE PWM MOTOR DRIVER ELECTRICAL CHARACTERISTICS at TA = +25°C, VBB = 45 V, VCC = 4.75 V to 5.25 V, VREF = 5.0 V (unless otherwise noted). Limits Characteristic Output Drivers (OUTA or OUTB) Motor Supply Range Output Leakage Current VBB ICEX VOUT = VBB VOUT = 0 Output Sustaining Voltage Output Saturation Voltage VCE(sus) VCE(SAT) IOUT = ±1.5 A, L = 3.0 mH Sink Driver, IOUT = +1.0 A Sink Driver, IOUT = +1.5 A Source Driver, IOUT = -1.0 A Source Driver, IOUT = -1.5 A Clamp Diode Leakage Current Clamp Diode Forward Voltage Driver Supply Current IR VF IBB(ON) IBB(OFF) Control Logic Input Voltage VIN(1) VIN(0) Input Current IIN(1) IIN(0) Reference Voltage Range Current Limit Threshold Thermal Shutdown Temp. Total Logic Supply Current VREF VREF/VSENSE TJ ICC(ON) ICC(OFF) VEN = 0.8 V, No Load VEN = 2.4 V, No Load All Inputs All Inputs VIN = 2.4 V VIN = 0.8 V Operating At Trip Point 2.4 — — — 1.5 9.5 — — — — —