Monolithic Digital LB1922 Three-Phase Brushless Motor Driver

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Monolithic Digital LB1922 Three-Phase Brushless Motor Driver

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Ordering number EN5679
Monolithic Digital
LB1922
Three-Phase Brushless Motor Driver Office Automation Applications
Overview
LB1922 single-chip drive circuit that provides direct drive output appropriate power brushless motors used office automation equipment. provides variety peripheral circuits chip, including
speed control circuit amplifier. optimal systems that 12-V power supply.
Package Dimensions
unit: 3147A-DIP28HS
[LB1922]
Allowable power dissipation,
With arbitrarily large heat sink
Ambient temperature,
SANYO: DIP28HS
Specifications
Absolute Maximum Ratings 25°C
Parameter Supply voltage Output current Allowable power dissipation Operating temperature Storage temperature Symbol max1 max2 Topr Tstg Independent With arbitrarily large heat sink Conditions Ratings +150 Unit
Allowable Operating Ranges 25°C
Parameter Supply voltage range Schmitt output applied voltage Symbol VFGS Fixed-voltage output current Schmitt output current Lock detection output current IFGS output output output Conditions Ratings Unit
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, JAPAN
63097HA(OT) 5679-1/10
LB1922 Electrical Characteristics 25°C,
Parameter Current drain Current drain Output saturation voltage Output saturation voltage Output leakage current [7-V Fixed-Voltage Output] Output voltage Line regulation Load regulation [5-V Fixed-Voltage Output] Output voltage Line regulation Load regulation [4-V Fixed-Voltage Output] Output voltage Line regulation Load regulation [Hall Amplifier] Input bias current Common-mode input voltage range Hall input sensitivity Hysteresis Input voltage (low high) Input voltage (high low) [Oscillator] Output high-level voltage Output low-level voltage Oscillator frequency Amplitude [Current Limiter Operation] Limiter [Thermal Shutdown Operation] Thermal shutdown operating temperature Hysteresis Amplifier] Input offset voltage Input bias current Output high-level voltage Output low-level voltage input sensitivity Following stage Schmitt amplitude Operating frequency range Open-loop gain [FGS Output] Output saturation voltage Output leakage current [Speed Discriminator] Output high-level voltage Output low-level voltage [PLL Output] Output high-level voltage Output low-level voltage [Number Counts] VOH(P) VOL(P) VOH(D) VOL(D) VO(FGS) IL(FGS) IO(FGS) f(FG) VIO(FG) IB(FG) VOH(FG) VOL(FG) Gain: Design target value VCC-VM VOH(CR) VOL(CR) f(CR) V(CR) 1000 Vp-p VSLH VSHL VICM mVp-p VFG1 VFG2 3.65 4.35 4.45 4.80 5.15 6.65 7.35 Symbol ICC1 ICC2 VO(sat)1 VO(sat)2 IOleak stop mode 10.5 10.5 Conditions Ratings Unit
Continued next page.
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LB1922
Continued from preceding page.
Parameter [Lock Detection] Output low-level voltage Lock range [Integrator] Input bias current Output high-level voltage Output low-level voltage Open-loop gain Gain-bandwidth product Reference voltage [Crystal Oscillator] Operating frequency range [Start/Stop Pin] Input high-level voltage Input low-level voltage Pull-down resistance [Forward/Reverse Pin] Input high-level voltage Input low-level voltage Hysteresis Pull-down resistance VIH(F/R) VIL(F/R) RD(F/R) VIH(S/S) VIL(S/S) RD(S/S) fOSC IB(INT) VOH(INT) VOL(INT) VX/2 -0.4 +0.4 VOL(LD) 0.15 6.25 Symbol Conditions Ratings Unit
Truth Table
Source sink OUT2 OUT1 OUT3 OUT1 OUT3 OUT2 OUT1 OUT2 OUT1 OUT3 OUT2 OUT3 F/R=L F/R=H
Note: high input defined IN-.
Assignment
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LB1922 Functions
FGIN+ FGIN- FGOUT OUT1 OUT2 OUT3 GND2 IN1+, IN1- IN2+, IN2- IN3+, IN3- X'tal GND1 DOUT INTIN INTOUT POUT FGSOUT power supply. power supply Power supply blocks other than output block pulse input (4-V power supply pin) pulse input amplifier output oscillator frequency setting Output Output Output Ground output block Forward/reverse control Forward: low, reverse: high Start/stop control Start: low, stop: high Output block power supply. This also used output current detection. output current converted voltage detected inserting resistor (Rf) between this VCC. Hall input OUT1 Hall input OUT2 Hall input OUT3 Crystal oscillator. Connect crystal oscillator this pin. Ground circuits other than output block. Lock detection Outputs level when motor speed within lock range, i.e. within ±6.25% speed. Speed discriminator output Outputs high level overspeed. Integrator input Integrator output (speed control pin) output amplifier output (After Schmitt circuit) Function
following formula gives relationship between crystal oscillator frequency (fOSC) frequency fFC. (servo) fOSC/(ECL divided times number counts) fOSC/8192 External Crystal Oscillator Circuit
External Constants (Provided reference only.)
Xtal (MHz) (pF) (pF) 0.82
However, crystal with ratio between impedance crystal fundamental frequency impedance third harmonic frequency (3fo) least must used.
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LB1922 LB1922 Functional Description Notes External Components Speed control circuit Speed control this implemented with combination speed discriminator circuit circuit. speed discriminator circuit outputs error output once every periods using charge pump technique. circuit outputs phase error once every period, also using charge pump technique. compared earlier technique only using speed discriminator circuit, combination speed discriminator circuit circuit better able suppress speed fluctuations when used situations where large load variations applied motor. Since servo frequency determined following formula, applications must determine motor speed setting number pulses crystal oscillator frequency. fFG(servo) fOSC/8192 fOSC: crystal oscillator frequency Direct drive minimize power loss output, this adopts direct drive technique. output transistors always saturated when motor drive adjusted changing duty with which output transistors Since output switching performed lower side transistors, Schottky diodes (D1, similar devices must connected between VCC. (This because devices used have short reverse recovery time, through currents will flow instant lower side transistors turn on.) Normal rectifying diodes used between ground. Current limiter circuit current limiter circuit operates current determined formula 0.5/Rf, operates peak current limiter. current limiting operation consists reducing duty with which output suppress current drawn. phase compensation capacitors required. Speed lock range speed lock range ±6.25% speed. When motor speed lock range goes low. (The open-collector output.) motor speed goes lock range, motor drive output duty modified according speed error. This controls motor speed lock range. frequency frequency determined resistor (R3) capacitor (C6) connected pin. connected fixed-voltage supply: fPWM 1/(1.2 connected fixed-voltage supply: fPWM 1/(0.5 value less frequency about desirable. frequency low, motor resonate frequency during motor constraint, frequency audible range result noise. Inversely, frequency high, loss output transistors during switching will increase. Ground leading GND1 (pin Ground circuits other than output block GND2 (pin Output block ground (the sink transistor emitter) must connected GND2. other external components must connected GND1. single ground point must taken GND1 GND2 connector. Since GND2 carries large currents, GND2 lines must kept short possible. Parasitic effects output Parasitic effects occur when output voltage falls -0.7 below GND1 GND2 potential. (Note that actual value become smaller than -0.7 device temperature characteristics.) Also, applications must designed that output voltage never exceeds more. parasitic effect occurs, first speed control will lost intermittently. parasitic effects increase, output transistors destroyed. Since
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LB1922 through current prevention, Schottky diodes with small This will prevent potential difference between output pins from becoming problem. Although normal rectifying diodes used design ground lines carefully described item "Ground leading", that parasitic effects occur. External interface pins Output type: open collector Voltage handling capacity: (absolute maximum) Saturation voltage sample-to-sample variation reference value (ILD Output type: open collector Voltage handling capacity: (absolute maximum) Saturation voltage sample-to-sample variation reference value (IFGS 0.12 0.18 output amplifier output converted pulse output hysteresis comparator. used speed monitor. used, pull-up resistor required. Start/Stop Input type: transistor base with 50-k pull-down resistor connected ground Threshold level (typical): About 4-V, 5-V, fixed-voltage supplies turned stop mode. Input type: transistor base with 50-k pull-down resistor connected ground Threshold level (typical): About (high low), about (low high) Hysteresis: about switching must only performed stop mode when motor stopped. Fixed-voltage supply temperature characteristics supply: about -0.5 mV/°C supply: about -0.6 mV/°C supply: about -2.5 mV/°C amplifier amplifier gain determined gain, will R2/21. amplifier frequency characteristics determined form high-pass filter form low-pass filter.) Since amplifier output input Schmitt comparator, values that amplifier output amplitude least p-p. desirable amplifier that output amplitude between during steady state motor operation.) External capacitors required stabilize FGIN+ fixed-voltage supply generate initial reset pulse internal logic. Although relatively small capacitance suffices power supply stabilization, larger capacitance (about required generate reset pulse. reset pulse generated time when FGIN+ goes from about reset function does operate, briefly startup. this phenomenon problem, capacitance around used After charged turned stop mode), capacitor will discharged IC-internal load about that connected this capacitor. required fixed-voltage supply stabilization. Since this adopts direct technique switches large currents outputs, extremely easy noise generated. Therefore, adequate powersupply stabilization required prevent that noise from causing incorrect circuit operation. through must connected GND1 with lines that short possible. particular, easily influence system characteristics requires care.
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LB1922 External resistors used apply high-level input pin. Since built-in pull-down resistor which about will level when left open. voltage between must applied input high level pin. used apply high-level input pin. Since built-in pull-down resistor which about will level when left open. voltage between must applied input start-state high level pin.) case with input, using two-resistor voltage divider apply voltage provides better noise immunity since lower input impedance However, applications where noise problem, high level applied with single resistor, done with this circuit. When first applied, comes slowly (around mV/ms slower) motor turn somewhat even though circuit stop mode. This because input voltage provided through tworesistor voltage divider when still relatively low, input voltage will below which start mode input level. impossible increase speed with which power voltage brought this problem, capacitor inserted between resolve problem. Through currents direct technique direct technique, through currents flow output switching. (This occurs both discrete component implementations well with LB1822.) This delay parasitic capacitors output transistors. Earlier application used capacitors deal with this problem occurred. However, since this includes circuits designed deal with this phenomenon, there need external components deal with these currents. During switching, whiskers about appear waveform, they will cause problems applications. Oscillators Normally, applications using this will crystal oscillator. However, possible ceramic oscillator applications which requirements speed control characteristics demanding. avoid problems, always consult manufacturer oscillator element concerning values external capacitors resistors used. internal power dissipation calculation (calculated with typical specifications) Power dissipation supply current (ICC) Stop mode: ICC1 0.41 Start mode: ICC2 0.08 Power dissipation when -10-mA load current drawn from fixed voltage output. (VCC 0.05 Power dissipation output drive current (when output duty 100%) {(VCC -1)2/8k} {(VCC 2)2/10k} (112/2k) (102/4k) 0.09 Power dissipation output transistors (when output duty 100%) (sat)2 Therefore, overall power dissipation will Start mode: 0.08 Stop mode: 5.95 (For output duty 100%)
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LB1922 Techniques measuring internal temperature increases 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 INT.IN ground measuring temperature this (Sanyo data: temperature characteristic about mV/°C.) external resistor must disconnected when measuring temperature. Servo constants servo constant calculations depend strongly characteristics motor used require special expertise. Normally, motor manufacturer will these constants. Sanyo provide data required servo constant calculations. This data includes both characteristics data this well frequency characteristics simulation data filter characteristics motor manufacturer. resistor (R10) between DOUT INT.IN small, then will become excessively large, large, then speed errors speed discriminator shutoff current integrator input current will become more likely occur. Therefore, this resistor should have value range resistor (R8) between POUT INT.IN small, influence system will become excessive lock state pull-in characteristics will degraded. Thus value this resistor must made small. recommend value around when Applications must designed first setting only speed discriminator system (R9, R10, only then setting system resistor
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LB1922 Equivalent Circuit Block Diagram
Speed discriminator
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LB1922 Sample Application Circuit
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. 5679-10/10

Monolithic Digital LB1922 Three-Phase Brushless Motor Driver

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