Monolithic Digital LB1695 Three-Phase Brushless Motor Driver

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Monolithic Digital LB1695 Three-Phase Brushless Motor Driver

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Ordering number EN5678
Monolithic Digital
LB1695
Three-Phase Brushless Motor Driver
Overview
LB1695 three-phase brushless motor driver that optimal motor drive home appliances such on-demand water heaters.
Current limiter circuit Low-voltage protection circuit Thermal shutdown protection circuit Hall amplifiers with hysteresis characteristics output function
Features
Three-phase brushless motor drive 45-V voltage handling capacity, output current
Package Dimensions
unit: 3196-DIP30SD
[LB1695]
Allowable power dissipation, Pdmax
With wiring density glass-epoxy board 114.3 76.2
SANYO: DIP30SD Ambient temperature,
Specifications
Absolute Maximum Ratings 25°C
Parameter Supply voltage Output current Allowable power dissipation Operating temperature Storage temperature Symbol Topr Tstg Mounted printed circuit board (114.3 76.2 glass-epoxy board) Conditions Ratings +100 +150 Unit
Allowable Operating Ranges 25°C
Parameter Power-supply voltage range Symbol VCC/t VM/t VLVSD(OFF)* Conditions Ratings more than 0.04 more than 0.16 Unit V/µs V/µs
Maximum power-supply slew rate power
Note: *These items stipulated because output through currents occur speed with which power-supply voltage rises fast when power first applied.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, JAPAN
63097HA(OT) 5678-1/7
LB1695 Electrical Characteristics 25°C,
Parameter Current drain Output saturation voltage Symbol VO(sat)1 VO(sat)2 Output leakage current [Hall Amplifier] Input bias current Common-mode input voltage range Hysteresis Input voltage (low high) Input voltage (high low) Pin] (Speed pulse output) Output low-level voltage Pull-up resistance [Forward/Reverse Operation] Forward Reverse [Current Limiter Operation] Limiter [Thermal Shutdown Operation] Operating temperature Hysteresis [Low-Voltage Protection Operation] Operating voltage Release voltage Hysteresis [Pin Charge current Discharge current Charge start voltage Discharge start voltage Output current ignored time Output time 4700 4700 VLVSD VLVSD(OFF) VLVSD 0.42 VFR1 VFR2 VFGL 10.0 12.5 VICM VSLH VSHL leak Forward rotation (sink) (source) (sink) (source) Conditions Ratings Unit
Note: *The items marked with asterisk design target values tested.
Assignment
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LB1695 Truth Table
Input Forward/reverse control Forward (low): Reverse (high): Output Output Source sink OUT2 OUT1 OUT1 OUT2 OUT3 OUT1 OUT1 OUT3 OUT3 OUT2 OUT2 OUT3 OUT1 OUT2 OUT2 OUT1 OUT1 OUT3 OUT3 OUT1 OUT2 OUT3 OUT3 OUT2 output
Functions
OUT1 OUT2 OUT3 voltage(V) Output Output Output Power supply that provides output Output current detection Connect resistor between this ground. current limiter limits output current value (current limiter operation). function Equivalent circuit
capacitor connected this determines both time output turned when current limiter operates time output current ignored.
resistor connected this determines charge current capacitor.
Continued next page.
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LB1695
Continued from preceding page.
FRAME voltage(V) function This used heat dissipation. Electrically, must left open. Equivalent circuit
Power circuits other than output block. First speed pulse output. pull-up resistor built
Second speed pulse output. pull-up resistor built
IN1- IN1+ IN2- IN2+ IN3- IN3+
VCC-1.8V
Hall element input Logic high defined IN-. Hall element input Logic high defined IN-. Hall element input Logic high defined IN-.
Forward/reverse control
Ground circuits other than output block. lowest potential output transistors will potential pin.
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LB1695 Block Diagram Peripheral Circuits
LB1695 Functional Description 1.Hall element input circuits Hall element input circuits differential amplifiers with hysteresis about (typical). operating level must within common-mode input voltage range (1.5 recommend providing input levels that exceed hysteresis least factor three (120 mVp-p) assure that circuit operation affected noise. ability withstand noise determined problem during noise evaluation other testing, insert capacitors about 0.01 between Hall input pins. 2.Protection circuit Low-voltage protection circuit sink side output transistors turned voltage falls below stipulated voltage (VLVSD). This circuit prevents incorrect operation when voltage reduced. Thermal shutdown circuit sink side output transistors turned junction temperature exceeds stipulated temperature (TSD). This circuit prevents from being destroyed overheating. Applications must designed that this circuit does operate except unusual situations. 3.FG output circuit LB1695 combines IN1, IN2, inputs then wave shapes combined signal. output same frequency Hall inputs, output frequency three times that Hall inputs. 4.Forward/reverse control circuit This circuit designed with assumption that direction will switched from while motor turning. direction switched while motor turning, through currents will flow output will become problem. recommend only using switching when power supply state, i.e. with motor stopped state. 5.VCC power supplies speed with which power-supply voltages (VCC rise when power first applied fast, through currents will flow output will become problem. Applications must assure that power supply rise speeds exceed 0.04 V/µs (VCC/t) 0.16 V/µs (VM/t). When applying power, desirable apply first then apply When turning power off, desirable first turn then wait motor stop, only then turn VCC. turned after turned while motor still turning
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LB1695 inertia, certain motor types cause voltage rise generate voltages that exceed voltage handling capacity 6.Power supply stabilization capacitor low-voltage protection circuit operate other problems occur large fluctuations occur line voltage. line must stabilized capacitor inserted between ground. Also, large switching currents that flow line cause fluctuations voltage inductive components circuit wiring. line must also stabilized capacitor inserted between ground prevent fluctuations ground line potential, incorrect operation, voltages that exceed voltage handling capacity particular, applications that have long circuit lines VCC, ground must have adequate stabilization capacitors inserted power lines. 7.Current limiter circuit current limiter circuit turns sink side output transistors when output current reaches limit value (the limit current). used current detection, output current detected voltage inserting resistor between ground. current limiter circuit operates when reaches (typical), thus output current limited current limit term 0.5/Rf. Output time After current limiter circuit operates turns sink side output transistors, then turns output again after fixed period (the output time) elapsed. This current limiter circuit output switching technique adopted LB1695 much less susceptible problems with than output limitation techniques which output operated saturated level. output time determined charge time capacitor connected pin. When current limiter circuit operates, capacitor begins charge, time required charge this capacitor voltage, which volts (typical), output time. When capacitor charged voltage volts, sink side output transistors turned again. charge current fixed current determined resistor connected pin. capacitor charge current output time toff related follows. 1.3/R must value range toff C/ICL 1.53 Output current ignored time While current limiter circuit operating sink side output off, regenerative current flows external diode provided absorb regenerative currents upper side output circuit that turned off. When sink side output turned after output time elapsed, reverse current flows instantaneously this diode diode's reverse recovery time. this phenomenon, current that reach current limit value flows instantaneously output. current limiter operated again this current, output would turned average current level would fall. This could result significantly lower torque during, example, motor startup. Therefore, prevent this current from being detected, current limiter circuit also provides fixed period (the output current ignored time) during which output current detected point where sink side output turned again after being turned off. output current ignored time determined discharge time capacitor connected pin. This discharge starts point where capacitor charged volts following operation current limiter circuit. output current ignored time time capacitor discharge volts (typical). capacitor discharge current fixed current current about three times charge current. Therefore, output current ignored time about output time. capacitor discharge current output current ignored time related follows. 1.3/R C/ICH 0.41 Since current limiter circuit provides slope time when sink side output turned again, reverse circuit never becomes significantly large, even rectifying diode (i.e. diode whose reverse recovery time particularly short) used regenerative current absorption external diode. Output time setting output time must period optimal type motor used. This time values external resistor attached external capacitor attached pin. Figure shows waveforms during current limiter operation.
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LB1695 shorter output time used: Since output time output current ignored time have ratio about internal circuits, possible these periods independently. Thus output current ignored period become insufficient output time excessively short period. output current ignored period short, reverse current regenerative current absorption external diode cause current limiter circuit operate. (See Section 7.2.) Also, output time decreased, diode reverse current will increase become problem. longer output time used: excessively long output time used, average current will decrease resulting reduced torque during motor startup. some motor types, this make impossible switch from current limiter operating state steady state operation.
voltage
voltage
Figure Current Limiter Operating Waveforms 8.IC internal power dissipation calculation (VCC ICC) (power dissipated motor coils) 9.Techniques measuring internal temperature increases Since possible measure internal temperature directly, following techniques normally used temperature measurement. Thermocouple measurement When using thermocouple temperature measurement, thermocouple attached heat sink. While this measurement technique simple, suffers from large measurement errors when thermal generation process steady state. Measurement using internal diode properties recommend using properties parasitic diode that exists between ground measuring temperature this high (off) state measure voltage parasitic diode. Then calculate temperature from temperature characteristics voltage.
products described contained herein intended surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment like, failure which directly indirectly cause injury, death property loss. Anyone purchasing products described contained herein above-mentioned shall: Accept full responsibility indemnify defend SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees, jointly severally, against claims litigation damages, cost expenses associated with such use: impose responsibility fault negligence which cited such claim litigation SANYO ELECTRIC CO., LTD., affiliates, subsidiaries distributors their officers employees jointly severally. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties. This catalog provides information June, 1997. Specifications information herein subject change without notice. 5678-7/7

Monolithic Digital LB1695 Three-Phase Brushless Motor Driver

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