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UNISONIC TECHNOLOGIES CO., LTD L6219
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) control 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, the maximum output current is determined 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.
LINEAR INTEGRATED CIRCUIT
SOP-24
*Pb-free plating product number: L6219L
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
ORDERING INFORMATION
Order Number Normal Lead Free Plating L6219-S24-R L6219L-S24-R L6219-S24-T L6219L-S24-T Package SOP-24 SOP-24 Packing Tape Reel Tube
L6219L-S24-R (1)Packing Type (2)Package Type (3)Lead Plating (1) R: Tape Reel, T: Tube (2) S24: SOP-24 (3) L: Lead Free Plating, Blank: Pb/Sn
www.unisonic.com.tw Copyright (c) 2005 Unisonic Technologies Co., Ltd
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L6219
PIN CONFIGURATION
LINEAR INTEGRATED CIRCUIT
OUT1A OUT2A SENSE2 COMP IN2 OUT2B GROUND GROUND
1 2 3 4 5 6 7 8 2
VBB
24 23
LOAD SUPPLY SENSE1 COMP IN1 OUT1B I01 GROUND GROUND I11 PHASE1
1
22 21 20 19 18 17
I02 I12 PHASE2
PWM1
9 PWM2 10 11 12
2
1
16 15 14
VREF1 RC1
LOGIC SUPPLY
VREF2 RC2
Vcc
13
PWM CURRENT-CONTROL CIRCUITRY
CHANNEL 1 TERMINAL NUMBERS SHOWN
VBB
24
OUTB 1 OUTA 21
VREF
15 20k
/ 10
23
SENSE COMP IN 22 RC
40k
+
CC RT
ONE SHOT 14 RC CT
SOURCE DISABLE
I0 I1
10k RS
20 17
TRUTH TABLE
PHASE H L OUTA H L OUTB L H
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L6219
TYPICAL APPLICATION
LINEAR INTEGRATED CIRCUIT
STEPPER MOTOR
1 2 RS Rc Cc 3 4 5 6 7 8 PWM2 FROM P VREF 2
VBB
24 23 RS Rc Cc +
VBB
1
22 21 20 19 18 17
FROM P
PWM1
9 10 11 12
2
1
16 15 14 VREF
Vcc
13 +5V
CT
RT
RT
CT
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L6219
ABSOLUTE MAXIMUM RATINGS (Ta = 25 )
PARAMETER Motor Supply Voltage
LINEAR INTEGRATED CIRCUIT
SYMBOL VBB
RATINGS UNIT 45 V Peak 1.0 A Output Current IOUT Continuous 750 mA Logic Supply Voltage VCC 7.0 V Logic Input Voltage Range VIN -0.3 ~ +7.0 V Output Emitter Voltage VSENSE 1.5 V Package Power Dissipation PD See graph Junction Temperature TJ 125 C Operating Temperature TOPR -20~+85 C Storage Temperature TSTG -40 ~ +150 C Note 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.The device is guaranteed to meet performance specification within 0 ~+70C operating temperature range and assured by design from -20 ~+85C. 3.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, TJ150C, VREF=5.0V)
PARAMETER SYMBOL Output Drivers(OUTA or OUTB) Motor Supply Range VBB Output Leakage Current Output Sustaining Voltage Output Saturation Voltage Clamp Diode Leakage Current Clamp Diode Forward Voltage Driver Supply Current
Control Logic
TEST CONDITIONS
MIN 10 45 2.4 1.5 9.5 13.5 25.5 -
TYP <1.0 <-1.0 0.4 1.0 1.0 1.3 <1.0 1.6 20 5.0 <1.0 -3.0 10 15 30 40 10 170
MAX 45 50 -50 0.6 1.2 1.2 1.5 50 2.0 25 10 0.8 20 -200 7.5 10.5 16.5 34.5 50 12 -
UNIT V A A V V V V V A V mA mA V V A A V mA
C
ILEAK VCE(SUS) VCE(SAT) IR VF IBB(ON) IBB(OFF) VIN(1) VIN(0) IIN(1) VREF VREF/VCOMPIN ICC(ON) ICC(OFF) TSHDN
VOUT=VBB VOUT=0 IOUT= 750mA,L=3.0mH Sink Driver, IOUT=+500mA Sink Driver, IOUT=+750mA Source Driver, IOUT= -500mA Source Driver, IOUT= -750mA VR=45V IF=750mA Both Bridges On, No Load Both Bridge Off All Inputs All Inputs VIN=2.4V VIN=0.8V Operating I0=I1=0.8V I0=2.4V,I1=0.8V I0=0.8V,I1=2.4V I0=I1=0.8V ,No Load I0=I1=2.4V ,No Load
Input Voltage Input Current Reference Voltage Range Current Limit Threshold (at trip point) Total Logic Supply Current Thermal Shutdown Temperature
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L6219
PWM CURRENT CONTROL
LINEAR INTEGRATED CIRCUIT
The L6219 dual bridge is designed to drive both windings of a bipolar stepper motor. 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 (especially for low-inductance loads) because of the internal logic and switching delays. This delay (td)is typically 2s.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 20k to 100k 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 erroneous 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).
PWM OUTPUT CURRENT WAVE FORM VPHASE
LOAD CURRENT PATHS VBB
IOUT+ 0 ITRIP RS
BRIDGE ON SOURCE OFF ALL OFF
tD
tOFF
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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L6219
TYPICAL CHARACTERISTIC
2.5
LINEAR INTEGRATED CIRCUIT
Allowable package power dissipation in watts
2.0 R 1.5 1.0 R
JT=55 JT=6
/W
/W
0.5 0 25
50
75
100
125
150
Temperature, in
UTC assumes no responsibility for equipm ent failures that result from using products at values that exceed, even mom entarily, rated values (such as m aximum ratings, operating condition ranges, or other param eters) 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 system s where m alfunction 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. The inform ation presented in this docum ent does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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