L6219DS

L6219DS ALLEGRO

Document overview

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Technical content

The L6219DS motor driver is designed to drive both windings of a bipolar stepper motor or bidirectionally control two dc motors. Both bridges are capable of sustaining 45 V and include internal pulse-width modulation (PWM) control of the output current to 750 mA. The outputs have been optimized for a low output saturation voltage drop (less than 1.8 V total source plus sink at 500 mA). For PWM current control, the maximum output current is deter- mined by the user’s selection of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0, 33, 67, or 100% of the maximum level. A PHASE input to each bridge determines load current direction. 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. The L6219DS is supplied in a 24-lead surface-mountable SOIC. Its batwing construction provides for maximum package power dissipation in the smallest possible construction. This device is also available on special order for operation from -40°C to +85°C or to +105°C.

FEATURES

I Interchangeable with SGS L6219DS I 750 mA Continuous Output Current I 45 V Output Sustaining Voltage I Internal Clamp Diodes I Internal PWM Current Control I Low Output Saturation Voltage I Internal Thermal Shutdown Circuitry I Similar to Dual PBL3717, UC3770 Data Sheet 29319.43 L6219DS θ 2 θ 1 VCC PWM 2 PWM 1 VBB GROUND GROUND GROUND GROUND I I PHASE 2 V REF 2 RC RC V REF 1 PHASE 1 I OUT SENSE 2 COMP IN OUT OUT COMP IN SENSE 1 OUT I LOAD SUPPLY LOGIC SUPPLY Dwg. PP-005-3 Always order by complete part number, e.g., L6219DS . ABSOLUTE MAXIMUM RATINGS at TJ ≤ 150°C Output Current, IOUT Logic Input Voltage Range, Package Power Dissipation, Operating Temperature Range, Storage Temperature Range, 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.

115 Northeast Cutoff, Box 15036

Worcester, Massachusetts 01615-0036 (508) 853-5000 L6219DS DUAL FULL-BRIDGE MOTOR DRIVER Copyright © 1998 Allegro MicroSystems, Inc. PWM CURRENT-CONTROL CIRCUITRY TRUTH TABLE PHASE OUTA OUTB H H L L L H VREF Dwg. EP-007-5 VBB COMP IN ONE SHOT SOURCE DISABLE RC I 0 ÷10 SENSE OUT A OUTB CHANNEL 1 TERMINAL NUMBERS SHOWN. RC RS RT CC CT 20 kΩ 40 kΩ 10 kΩ 100 125 150 2.5 1.5 1.0 0.5 TEMPERATURE in °C 2.0 Dwg. GP-019B R = 6°C/W θJT R = 55°C/W θJA ALLOWABLE PACKAGE POWER DISSIPATION in WATTS

Min. Typ. Max. Units Output Drivers (OUTA or OUTB) Motor Supply Range VBB V Output Leakage Current ICEX VOUT = VBB < 1.0 µA VOUT = 0 <-1.0 -50 µA Output Sustaining Voltage VCE(sus) IOUT = ±750 mA, L = 3.0 mH V Output Saturation Voltage VCE(SAT) Sink Driver, IOUT = +500 mA 0.4 0.6 V Sink Driver, IOUT = +750 mA 1.0 1.2 V Source Driver, IOUT = -500 mA 1.0 1.2 V Source Driver, IOUT = -750 mA 1.3 1.5 V Clamp Diode Leakage Current IR VR = 45 V < 1.0 µA Clamp Diode Forward Voltage VF IF = 750 mA 1.6 2.0 V Driver Supply Current IBB(ON) Both Bridges On, No Load mA IBB(OFF) Both Bridges Off 5.0 mA Control Logic Input Voltage VIN(1) All inputs 2.4 V VIN(0) All inputs 0.8 V Input Current IIN(1) VIN = 2.4 V <1.0 µA VIN = 0.8 V - 3.0 -200 µA Reference Voltage Range VREF Operating 1.5 7.5 V Current Limit Threshold VREF/VCOMPIN I0 = I1 = 0.8 V 9.5 10.5 I0 = 2.4 V, I1 = 0.8 V 13.5 16.5 I0 = 0.8 V, I1 = 2.4 V 25.5 34.5 Thermal Shutdown Temperature TJ 170 Total Logic Supply Current ICC(ON) I0 = I1 = 0.8 V, No Load mA ICC(OFF) I0 = I1 = 2.4 V, No Load mA (at trip point) ELECTRICAL CHARACTERISTICS at TA = +25°C, TJ ≤ 150°C, VBB = 45 V, VCC = 4.75 V to 5.25 V, VREF = 5.0 V (unless otherwise noted).

Worcester, Massachusetts 01615-0036 (508) 853-5000 L6219DS DUAL FULL-BRIDGE MOTOR DRIVER APPLICATIONS INFORMATION PWM CURRENT CONTROL The L6219DS dual bridge is designed to drive both windings of a bipolar stepper motor. Output current is sensed and con- trolled independently in each bridge by an external sense resistor (RS), internal com- parator, and monostable multivibrator. When the bridge is turned on, current increases in the motor winding and it is sensed by the external sense resistor until the sense voltage (VCOMPIN) reaches the level set at the comparator’s input: ITRIP = VREF/10 RS The comparator then triggers the monostable which turns off the source driver of the bridge. The actual load current peak will be slightly higher than the trip point (especially for low-inductance loads) be- cause of the internal logic and switching delays. This delay (td) is typically 2 µs. After turn-off, the motor current decays, circulating through the ground-clamp diode and sink transistor. The source driver’s off time (and therefore the magnitude of the current decrease) is determined by the monostable’s external RC timing components, where toff = RTCT within the range of 20 kΩ to 100 kΩ and 100 pF to 1000 pF. When the source driver is re-enabled, the winding current (the sense voltage) is again allowed to rise to the comparator’s threshold. This cycle repeats itself, maintain- ing the average motor winding current at the desired level. Loads with high distributed capaci- tances may result in high turn-on current peaks. This peak (appearing across RS) will attempt to trip the comparator, resulting in erroneous current control or high-fre- quency oscillations. An external RCCC time delay should be used to further delay the action of the comparator. Depending on load type, many applications will not require these external components (SENSE connected to COMP IN). PWM OUTPUT CURRENT WAVE FORM LOAD CURRENT PATHS Dwg. WM-003-1A VPHASE I OUT td toff I TRIP Dwg. EP-006-1 RS BB V BRIDGE ON SOURCE OFF ALL OFF

LOGIC CONTROL OF OUTPUT CURRENT Two logic level inputs (l0 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 Output Current L L VREF/10 RS = ITRIP H L VREF/15 RS = 2/3 ITRIP L H VREF/30 RS = 1/3 ITRIP H H These logic level inputs greatly enhance the implementation of µP-controlled drive formats. During half-step operations, the l0 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 l0 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 (l0 = 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, l0,and I1 inputs float high. Varying the reference voltage (VREF) 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 VREF Dwg. EP-008-2 VBB FROM µP VREF +5 V STEPPER MOTOR RS RS RC RC RT RT CT CT CC CC θ 2 θ 1 VCC PWM 2 PWM 1 VBB

Worcester, Massachusetts 01615-0036 (508) 853-5000 L6219DS DUAL FULL-BRIDGE MOTOR DRIVER 0° TO 8 0.2992 0.2914 0.6141 0.5985 0.491 0.394 0.020 0.013 0.0926 0.1043 0.0040 MIN. 0.0125 0.0091 Dwg. MA-008-25 in 0.050 BSC NOTE 1 NOTE 3 0.050 0.016 0° TO 8 7.60 7.40 15.60 15.20 10.65 10.00 0.51 0.33 2.65 2.35 0.10 MIN. 0.32 0.23 Dwg. MA-008-25A mm 1.27 BSC NOTE 1 NOTE 3 1.27 0.40 Dimensions in Inches (for reference only) Dimensions in Millimeters (controlling dimensions) NOTES: 1. Webbed lead frame. Leads indicated are internally one piece. 2. Lead spacing tolerance is non-cumulative. 3. Exact body and lead configuration at vendor’s option within limits shown.

BRIDGE & HALF-BRIDGE DRIVERS IN ORDER OF 1) OUTPUT CURRENT AND 2) OUTPUT VOLTAGE Output Ratings * V

Description

Number † ±650 dual PWM full bridge X bipolar X 3966 dual PWM full bridge X bipolar X 3968 ±750 dual PWM full bridge X bipolar X 2916 dual PWM full bridge X bipolar X 2919 dual PWM full bridge X bipolar X 6219 ±800 dual PWM full bridge X bipolar X 3964 ±900 3-Ø back-EMF controller/driver X DMOS X 8902-A ±1300 PWM full bridge X bipolar X 3953 ±1500 dual PWM full bridge X bipolar X 2917 dual PWM full bridge X bipolar X 2918 PWM microstepping full bridge X Darlington/Satlington™ X 3955 PWM microstepping full bridge X Darlington/Satlington™ X 3957 ±2000 3-Ø brushless controller/driver X Darlington X 2936 dual full bridge X Darlington X 2998 PWM full-bridge X Darlington X 3951 PWM full-bridge X Darlington X 3952 PWM full-bridge X DMOS X 3958 ±3000 PWM control X Darlington 2962 ±3400 PWM control X bipolar X 2961 3-Ø MOSFET controller DMOS X 3933 * Current is maximum specified test condition, voltage is maximum rating. See specification for sustaining voltage limits or over-current protection voltage limits. † Complete part number includes additional characters to indicate operating temperature range and package style.

Worcester, Massachusetts 01615-0036 (508) 853-5000 L6219DS DUAL FULL-BRIDGE MOTOR DRIVER The products described here are manufactured under one or more Allegro MicroSystems, Inc. reserves the right to make, from time to time, such departures from the detail specifications as may be required to permit improvements in the performance, reliability, or manufacturability of its products. Before placing an order, the user is cautioned to verify that the information being relied upon is current. Allegro products are not authorized for use as critical components in life-support devices or systems without express written approval. The information included herein is believed to be accurate and reliable. However, Allegro MicroSystems, Inc. assumes no responsi- bility for its use; nor for any infringement of patents or other rights of third parties which may result from its use.