L6219_19 UTC | Alldatasheet
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UNISONIC TECHNOLOGIES CO., LTD L6219 LINEAR INTEGRATED CIRCUIT www.unisonic.com.tw 1 of 9 Copyright © 2019 Unisonic Technologies Co., Ltd QW-R109-005.D DUAL FULL-BRIDGE PWM MOTOR DRIVER DESCRIPTION The L6219 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 45V and include internal pulse-width modulation (PWM) cont rol of the output current to 750mA .The outputs have been optimized for a low output saturation voltage drop (less than 1.8V total source plus sink at 500mA ). For PWM current control, t he maximum output current is determined by the user’s select ion of a reference voltage and sensing resistor. Two logic-level inputs select output current limits of 0, 33, 67,or 100% of the maxi mum level. A phase input to each bridge determines load current direction. The bridges include both ground clamp and flyback diodes for protection against inductive transie nts. 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. FEATURES *Interchangeable with SGS L6219 *750mA Continuous Output Current *45V Output Sustaining Voltage *Internal Clamp Diodes *Internal PWM Current Control *low Output Saturation Voltage *Internal Thermal Shutdown Circuitry SOP-24 ORDERING INFORMATION Ordering Number Lead Free Halogen Free Package Packing L6219L-S24-R L6219G-S24-R SOP-24 Tape Reel L6219G-S24-R (1)Packing Type (2)Package Type (1) R: Tape Reel (2) S24: SOP-24 (3) G: Halogen Free and Lead Free, L: Lead Free(3)Green Package
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 2 of 9 www.unisonic.com.tw QW-R109-005.D MARKING PIN CONFIGURATION GROUND GROUND SENSE2 RC2 VREF2 PHASE2 I12 I02 OUT2B COMP IN2 OUT2A OUT1A LOAD SUPPLY SENSE1 COMP IN1 OUT1B I01 GROUND GROUND I11 PHASE1 VREF1 RC1 LOGIC SUPPLY Vcc VB B
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 3 of 9 www.unisonic.com.tw QW-R109-005.D TRUTH TABLE PHASE OUTA OUTB H H L L L H PWM CURRENT-CONTROL CIRCUITRY
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 4 of 9 www.unisonic.com.tw QW-R109-005.D ABSOLUTE MAXIMUM RATINGS (TA=25°C, unless otherwise specified) PARAMETER SYMBOL RATINGS UNIT Motor Supply Voltage V BB 45 V Peak 1.0 A Output Current Continuous IOUT 750 mA Logic Supply Voltage V CC 7.0 V Logic Input Voltage Range V IN -0.3 ~ +7.0 V Output Emitter Voltage V SENSE 1.5 V Package Power Dissipation P D See graph Junction Temperature T J +125 C Operating Temperature T OPR -20 ~ +85 C Storage Temperature T STG -40 ~ +150 C Notes: 1. Absolute maximum ratings are those values beyond which the device could be permanently damaged. Absolute maximum ratings are stress ratings only and functional device operation is not implied. 2. 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 +150C ELECTRICAL CHARACTERISTICS (TA=25C, VCC=4.75V to 5.25V, VBB=45V, TJ≤150C, VREF=5.0V) PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Output Drivers(OUTA or OUTB) Motor Supply Range V BB 10 - 45 V VOUT=VBB - <1.0 50 μA Output Leakage Current I LEAK VOUT=0 - <-1.0 -50 μA Output Sustaining Voltage V CE(SUS) I OUT=±750mA,L=3.0mH 45 - - V Sink Driver, IOUT=+500mA - 0.4 0.6 V Sink Driver, IOUT=+750mA - 1.0 1.2 V Source Driver, IOUT= -500mA - 1.0 1.2 V Output Saturation Voltage V CE(SAT) Source Driver, IOUT= -750mA - 1.3 1.5 V Clamp Diode Leakage Current I R V R=45V - <1.0 50 μA Clamp Diode Forward Voltage V F I F=750mA - 1.6 2.0 V IBB(ON) Both Bridges On, No Load - 20 25 mADriver Supply Current IBB(OFF) Both Bridge Off - 5.0 10 mA Control Logic VIN(1) All Inputs 2.4 - - V Input Voltage VIN(0) All Inputs - - 0.8 V VIN=2.4V - <1.0 20 μA Input Current I IN(1) VIN=0.8V - -3.0 -200 μA Reference Voltage Range V REF Operating 1.5 - 7.5 V I0=I1=0.8V 9.5 10 10.5 - I0=2.4V, I1=0.8V 13.5 15 16.5 - Current Limit Threshold (at trip point) VREF/VCOMPIN ICC(ON) I 0=I1=0.8V, No Load - 40 50 Total Logic Supply Current ICC(OFF) I 0=I1=2.4V, No Load - 10 12 mA Thermal Shutdown Temperature T SHDN - 170 - C
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 5 of 9 www.unisonic.com.tw QW-R109-005.D APPLICATION INFORMATION Logic Control Of Output Current Two logic level inputs (I 0 and I1) allow digital selection of the motor windi ng 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. These logic level inputs greatly enhance the implementation of μP-controlled drive formats. During half-step operations, the I 0 and I 1 allow the μP to control the motor at a constant torque between all positions in an eight-step s equence. This is accomplished by digitally selection 100% drive current when only one phase is on and 67% drive current when tw o phases are on. Logic highs on both I 0 and I1 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” conditions and/or increased current (and available torque )for start-up conditions. Current-Control Truth Table I0 I 1 Output Current L L VREF/10RS=ITRIP H L VREF/15RS=2/3 ITRIP L H VREF/30RS=1/3 ITRIP H H 0 General The PHASE input to each bridge determines the direction mo tor winding current flows. An internally generated dead time (approximately 2μs) prevents crossover currents that can occur when switching the PHASE input. All four drivers in the bridge out put can be tuned off between steps (I 0=I1≥2.4V) resulting in a fast current decay through the internal output clamp and flyback diodes. The fa st current decay is desirable in half-step and high-speed applications. The PHASE,I0, and I1 inputs float high. Varying the reference voltage (V REF) provides continuous control of th e peak load current for microstepping applications. Thermal protection circuitry turns off all driv ers when the junction temperature reaches +170 C. It is only intended to protect the device from failures due to excessive ju nction temperature and should not imply that output short circuits are permitted. The output drivers are re-enabled when the junction temperature cools to +145C. The UTC L6219 output drivers are optimized for low output satu ration voltages-less than 1.8V total (source plus sink) at 500mA.Under normal operating conditions, when co mbined with the excellent thermal properties of the batwing package design, this allows continuous operation of both bridges simultaneously at 500mA. Current Sensing To minimize current sensing inaccuracies caused by ground trace IR drops, each cu rrent-sensing resistor should have a separate return to the ground terminal of the device. For low-value sense resistors, the IR drops in the PCB can be significant and should be taken into account. The use of sockets should be avoided as their contact resistance can cause variations in the effective value of RS. Generally, larger values of R S reduce the aforementioned effects but can result in excessive heating and power loss in the sense resistor. The selected value of R S should not cause the absolute maximum voltage rating of 1.5 V, for the SENSE terminal, to be exceeded. The recommended value of RS is in the range of: RS=0.75/ITRIP(max) ±50% . If desired, the reference input voltage ca n be filtered by placing a capacitor from REFIN to ground. The ground return for this capacitor as well as the bottom of any re sistor divider used should be i ndependent of the high-current power-ground trace to avoid changes in REFIN due to IR drops.
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 6 of 9 www.unisonic.com.tw QW-R109-005.D APPLICATION INFORMATION (Cont.) Thermal Considerations For reliable operation, it is recomm ended that the maximum junction temperature be kept below 110°C to 125°C. The junction temperature can be measured best by attaching a thermocouple to the power pins (6, 7, 18 and 19) of the device and measuring the pin temperature, T TAB. The junction temperature can then be approximated by using the formula: TJ=TTAB +(2×ILOAD×VF×RθJT) where V F can be chosen from the electrical spec ification table for the given level of I LOAD. The value for R θJT is approximately 6°C/W. The power dissipation can be improved 20% to 30% by adding a section of printed circuit board copper (typically 6 to 18 square centimeters) connected to the power pins of the device. The thermal performance in applications that run at high load cu rrents, high duty cycles, or both can be improved by adding external diodes from each output to ground in parallel with the internal diodes. Fast-recovery ( ≤200 ns) diodes should be used to minimize switching losses. Load Supply Terminal The load supply terminal, VBB, should be decoupled with an electrolytic capacitor (≥47μF is recommended), placed as close to the device as is physically practical. To mini mize the effect of system ground IR drops on the logic and reference input signals, the system ground should have a low-resistance return to the load supply voltage. Fixed Off-Time Selection With increasing values of t OFF, switching losses decrease, low level load current regulation improves, EMI reduces, PWM frequency decreases, and ripple current increases. The value of t OFF can be chosen for optimization of these parameters. For applications where audib le noise is a concern, typical values of t OFF should be chosen in the range of 15 to 35μs.
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 7 of 9 www.unisonic.com.tw QW-R109-005.D PWM CURRENT CONTROL The UTC L6219 dual bridge is designed to drive both windings of a bipolar stepper moto r. Output current is sensed and controlled independently in each bridge by an external sense resistor (Rs), internal comparator, 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/10Rs 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 (esp ecially for low-inductance loads) because 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 transisto r. The source driver’s off time (and therefore the magnitude of the current decrease)is determined by the monostable’s external R C timing components, where t OFF=RTCT within the range of 20kΩ to 100kΩ and 100pF to 1000pF 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, maintaining the average motor winding current at the desired level. Loads with high distributed capacitances may result in high turn-on current peaks. This peak (appearing across Rs) will attempt to trip the comparator, resulting in e rroneous current control or high-frequency 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).
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 8 of 9 www.unisonic.com.tw QW-R109-005.D TYPICAL APPLICATION PWM2 PWM1
L6219 LINEAR INTEGRATED CIRCUIT UNISONIC TECHNOLOGIES CO., LTD 9 of 9 www.unisonic.com.tw QW-R109-005.D TYPICAL CHARACTERISTIC UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. UTC reserves the right to make changes to information published in this document, including without limitation specifications and product descriptions, at any time and without notice. This document supersedes and replaces all information supplied prior to the publication hereof.