Monolithic Digital LB1821M Power Brushless Motor Pre-Driver
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Ordering number EN5686
Monolithic Digital
LB1821M
Power Brushless Motor Pre-Driver Equipment
Overview
LB1821M pre-driver that supports direct drive appropriate power brushless motors used office automation equipment. motor drive circuit with desired output capability (voltage current characteristics) constructed attaching driver array output. LB1821M includes chip speed control circuit that allows motor speed varied using external clock.
Package Dimensions
unit: 3148-QFP44MA
[LB1821M]
Features
Direct drive output Speed discriminator speed control circuit integrating amplifiers Forward/reverse switching circuit Braking circuit (short braking) Speed lock detection output Full complement on-chip protection circuits, including lock protection, current limiter, thermal shutdown protection circuits.
SANYO: QIP44MA
Specifications
Absolute Maximum Ratings 25°C
Parameter Maximum supply voltage Maximum input current Output current Allowable power dissipation Operating temperature Storage temperature Symbol IREG Topr Tstg VREG outputs Conditions Ratings +150 Unit
Allowable Operating Ranges 25°C
Parameter Supply voltage Input current range Schmitt output applied voltage Schmitt output current Lock detection output current Symbol IREG VFGS IFGS VREG Conditions Ratings Unit
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, JAPAN
63097HA(OT) 5686-1/16
LB1821M
Allowable power dissipation, Pdmax
Ambient temperature,
Electrical Characteristics 25°C,
Parameter Symbol ICC1 Current drain ICC2 ICC3 ICC4 Output saturation voltage Output current Output leakage current Output voltage [Hall Amplifier] Input bias current Common-mode input voltage range Hall input sensitivity Hysteresis Input voltage high Input voltage high Oscillator] Output high-level voltage VOH(CR)1 VOH(CR)2 VOL(CR)1 VOL(CR)2 (CR) V(CR)1 V(CR)2 VOH(RK)1 VOH(RK)2 VOL(RK)1 VOL(RK)2 ICHG1 ICHG2 (RK) V(RK)1 V(RK)2 0.068 1500 Vp-p Vp-p IHB(HA) VICM VIN(HA) VIN(HA) VSLH VSHL mVp-p (sat) leak stop mode stop mode output, output, VOUT output output Conditions Ratings Unit
Output low-level voltage Oscillator frequency Amplitude [CROCK Oscillator]
Output high-level voltage
Output low-level voltage External capacitor charge current External capacitor discharge current Oscillator frequency Amplitude
Vp-p Vp-p
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LB1821M
Continued from preceding page.
Parameter [VCO Oscillator] output high-level voltage VOH(C)1 VOH(C)2 VOL(C)1 VOL(C)2 V(C) VREG VIO(FG) IB(FG) VOH(FG) VOL(FG) Gain: (FG) VO(FGS) IL(FGS) VOH(D) VOL(D) VOH(P)1 VOH(P)2 VOL(P)1 VOL(P)2 VOH(VCO) VOL(VCO) VOL(LD) IL(LD) -6.25 4.05 3.25 1.85 1.25 IO(FGS) Design target value Design target value Vp-p Symbol Conditions Ratings Unit
output low-level voltage Oscillator frequency Amplitude [Current Limiter Operation] Limiter [Thermal Shutdown Operation] Thermal shutdown operating temperature Hysteresis VREG voltage Amplifier] Input offset voltage Input bias current Output high-level voltage Output low-level voltage input sensitivity Schmitt amplitude next stage Operating frequency range Open-loop gain [FGS Output] Output saturation voltage Output leakage current [Speed Discriminator Output] Output high-level voltage Output low-level voltage [Speed Control Output]
0.47
0.52
0.57
4.35 3.55 2.15 1.55
4.65 3.83 2.45 1.85
Output high-level voltage
Output low-level voltage [VCO Output] Output high-level voltage Output low-level voltage [Lock Detection] Output saturation voltage Output leakage current Lock range [Integrator] Input offset voltage Input bias current Output high-level voltage Output low-level voltage Open-loop gain Input bias current Gain-bandwidth product Reference voltage [Filter Amplifier] Input bias current Output high-level voltage Output low-level voltage Reference voltage
+6.25
VIO(INT) IB(INT) VOH(INT) VOL(INT)
-0.4
+0.4
VB(INT) IB(FIL) VOH(FIL) VOL(FIL) VB(FIL)1 VB(FIL)2
VCC/2
-0.4
+0.4
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LB1821M
Continued from preceding page.
Parameter [S/S Pin] Output high-level voltage Output low-level voltage Hysteresis Pull-up resistance [F/R Pin] Input high-level voltage Input low-level voltage Hysteresis Pull-up resistance Pin] Input high-level voltage Input low-level voltage Hysteresis Pull-up resistance [CLK Pin] Input high-level voltage Input low-level voltage Hysteresis Pull-up resistance Input frequency Pin] Input high-level voltage Input low-level voltage Hysteresis Pull-up resistance Pin] Input high-level voltage Input low-level voltage Hysteresis Pull-up resistance [Low Voltage Protection] Operating voltage Release voltage Hysteresis VSDL VSDH 0.15 3.75 0.25 0.35 VIH(N2) VIL(N2) VIN(N2)1 VIN(N2)2 RU(N2) 0.35 0.24 0.45 0.34 0.55 0.44 VIH(N1) VIL(N1) VIN(N1)1 VIN(N1)2 RU(N1) 0.35 0.24 0.45 0.34 0.55 0.44 VIH(CLK) VIL(CLK) Design target value Design target value 0.35 0.24 0.45 0.34 0.55 0.44 VIH(BR) VIL(BR) VIN(BR)1 VIN(BR)2 RU(BR) 0.35 0.24 0.45 0.34 0.55 0.44 VIH(F/R) VIL(F/R) VIN(F/R)1 VIN(F/R)2 RU(F/R) 0.35 0.24 0.45 0.34 0.55 0.44 VOH(S/S) VOL(S/S) VIN(S/S)1 VIN(S/S)2 RU(S/S) 0.35 0.24 0.45 0.34 0.55 0.44 Symbol Conditions Ratings Unit
VIN(CLK)1 Design target value VIN(CLK)2 Design target value RU(CLK) (CLK)
Speed Discriminator Counts
High open High open High open High open Number counts
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LB1821M Three-Phase Logic Truth Table high input state where IN-.)
F/R=L Item F/R=H Output Source Sink
High open Stop Start
High open Brake Released
Assignment
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LB1821M Sample Application Circuit
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LB1821M Internal Equivalent Circuit Block Diagram
Speed control system
Speed discriminator
system
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LB1821M Operation Description Speed Control Circuit This implements speed control using combination speed discriminator circuit circuit. speed discriminator circuit output (using charge pump technique) error signal once every periods. compared earlier technique which only speed discriminator circuit used, combination speed discriminator circuit allows variations motor speed better suppressed when motor that large load variations used. servo frequency controlled same frequency clock signal input pin. This means that motor speed changed changing clock frequency. Circuit LB1821M includes on-chip circuit generate reference signal speed discriminator circuit. reference signal frequency determined following formula. fVCO fCLK number counts fVCO: Reference signal frequency fCLK: Frequency externally input clock signal range over which reference signal varied determined resistor capacitor connected (pin (pin loop filter constants (the external constants connected pins 42). (Reference Values)
Supply voltage (pF)
value must less than
Applications handle wider range speed variations than would possible fixed number counts used changing number discriminator counts (which related divisor circuit). number counts switched between 128, 256, setting (pin (pin pins. Output Drive Circuit reduce power loss output, this adopts direct drive technique. output transistors (which external always saturated when motor drive output adjusted changing duty with which output Since (external) output switching handled upper side output transistors, Schottky diode similar device must connected between output (OUT) ground. This because through current will flows instant upper side output transistors turn diode with short reverse recovery time used. rectifying diode used between VCC. Transistors that have parasitic diodes must used lower side output transistors. these transistors have parasitic diode components, then through currents will occur reverse recovery time parasitic diodes despite inclusion external Schottky diodes. Current Limiter Circuit current limiter circuit limits (peak) current value VRF/Rf (VRF 0.52 (typical), current detection resistor). current limitation operation consists reducing output duty suppress current. Speed Lock Range speed lock range ±6.25% fixed speed. When motor speed lock range, open collector output) goes low. motor speed goes lock range, motor duty adjusted according speed error control motor speed within lock range. Caution required, since signal initially startup. will while three signal pulses input.) Notes Frequency frequency determined resistor capacitor connected pin. fPWM 1/(0.48 frequency between desirable. frequency low, motor resonate
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LB1821M frequency during motor control, that frequency audible range, that resonation result audible noise. frequency high, output transistor switching loss will increase. external resistor must have value under Hall Input Signals Input signals with amplitude greater than hysteresis maximum) required Hall inputs. input amplitude greater desirable, taking noise other considerations into account. Hall input voltage must fall within common-mode input voltage range specifications. Forward/Reverse (F/R) Switching used switch motor direction. direction switched with even motor turning. circuit designed compensate through currents that occur when direction switched. However, caution required with respect increases voltage (due motor current returning power system instantaneously) during direction switching. this problem, increasing capacitance capacitor connected between power supply ground. Brake Switching LB1821M implements short braking technique which upper side transistors (the external transistors) phases turned (The lower side transistors phases turned off.) This means that output current during braking does pass through (the current detection resistor) therefore that current limiter does function. Thus caution required. During braking, upper side transistors operate 100% duty, regardless motor speed. braking function operated released start state. Thus motor start stop control performed from brake with level, i.e., with system start state. startup time problem, motor started with shorter startup time using brake motor start/stop control than with pin. (This because stop state power saving state, restarting from this state requires waiting time required circuit stabilize.) Constraint Protection Circuit LB1821M includes on-chip constraint protection circuit protect motor motor constraint mode. output remains high (indicating locked state) fixed period start state, upper side (external) transistors turned off. This time capacitance capacitor attached CROCK pin. time seconds with capacitance under <Set time (s)> (µF) release constraint protection state, LB1821M must either stop state brake state, power must reapplied. CROCK must connected ground constraint protection circuit used. However, note that clock disconnection protection circuit described later cannot used this case. Clock Disconnection Protection Circuit clock input stops with LB1821M start state, this protection circuit operates turns (external) upper side output transistors. clock reapplied, resumes operation. Low-Voltage Protection Circuit LB1821M includes low-voltage protection circuit protect against incorrect operation when power first applied power-supply voltage (VCC) falls. (external) upper side output transistors turned falls under about 3.75 volts, this function cleared about volts. Power Supply Stabilization Since this used applications that draw large output currents, power-supply line subject fluctuations. Therefore, capacitors with capacitances adequate stabilize power-supply voltage must connected between ground. diodes inserted power-supply line prevent destruction reverse power supply connection, since this makes power-supply voltage even more subject fluctuations, even larger capacitors will required. Ground Lines signal system ground output system ground must separated single ground point must taken connector. Since output system ground carries large currents, this ground line must made short possible.
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LB1821M Output system ground Ground output diodes Signal system ground Ground external components VREG motor drive system formed from single power supply, VREG (pin used create powersupply voltage (about this VREG shunt regulator generates voltage about volts passing current through external resistor. stable voltage generated setting current value range external transistors must have current capacities least cover Hall bias current output current <source> requirements) they must have voltage handling capacities excess motor power-supply voltage. Since heat generated these transistor problem, heat sinks required depending packages used. power-supply voltage (4.4 provided from external circuit, apply that voltage directly pin(pin 32). that case, VREG must either left open connected ground. Amplifier Normally, amplifier used construct filter amplifier such that shown application circuit reject noise. Since Schmitt comparator connected after amplifier, applications must amplification that amplifier output amplitude least p-p. (However, setting that results amplitude during steady-state rotation desirable.) capacitor connected between FGIN+ (pin ground required bias voltage stabilization generate initial reset pulse internal logic. reset pulse generated time takes FGIN+ from about Integrating Amplifier integrating amplifier integrates speed error pulses phase error pulses converts them speed command voltage. same time also sets control loop gain frequency characteristics using external components. integrating amplifier output (pin normally connected (pin external line. Separating integrating amplifier output control circuit allows applications switch integrating amplifier constants using external operational amplifier, analog switch, other circuit. This useful applications that require integration constant switching wide range variability motor speeds that must provided. Filter Amplifier filter amplifier converts system output voltage. amplifier input resistor (about built Therefore, gain frequency characteristics feedback resistor feedback capacitor. Since range frequency variation supported becomes narrower gain reduced, desirable gain this amplifier higher. Startup Techniques motor started stopped repeatedly over short period, charge accumulated integrating amplifier's external capacitor become problem. (This result abnormal speed overshooting startup other problems.) circuit shown below effective resolving this problem.
Added circuit signal
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LB1821M Functions
Functions Equivalent circuit
INTOUT
Integrating amplifier output (speed control)
INTIN
Integrating amplifier inverting input
INTREF
Integrating amplifier noninverting input potential VCC)
DOUT
Speed discriminator output Outputs level over speed. Acceleration high, deceleration
POUT
Speed control system output Outputs phase comparison result fCLK fFG.
Speed lock detection output Open collector output Goes when motor speed within speed lock range (±6.25%).
Continued next page.
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LB1821M
Continued from preceding page.
Functions Equivalent circuit
Brake control (short braking operation) Low: High: open state functions high-level input. start, high open brake mode operation. hysteresis about 0.45
Forward/reverse control Low: High: open state functions high-level input. forward, high open reverse rotation. hysteresis about 0.45
External clock signal input Low: High: open state functions high-level input. hysteresis about 0.45 kHz, maximum
Start/stop control Low: High: VREG open state functions high-level input. start, high open stop mode operation. hysteresis about 0.45
Speed discriminator count switching Low: High: open state functions high-level input. hysteresis about 0.45
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LB1821M
Continued from preceding page.
Functions Equivalent circuit
Speed discriminator count switching Low: High: open state functions high-level input. hysteresis about 0.45
FGSOUT
amplifier output (after Schmitt circuit) This open collector output.
FGOUT
amplifier output This connected Schmitt comparator circuit internally
Schmitt comparator
FGIN-
amplifier inverting input
reset circuit amplifier noninverting input (1/2 potential) initial reset applied logic circuit block connecting external capacitor about between FGIN+ ground.
FGIN+
Ground connections These pins connected internally frame.
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LB1821M
Continued from preceding page.
Functions Equivalent circuit
IN1+ IN1- IN2+ IN2- IN3+ IN3-
Hall inputs High defined IN-, opposite. amplitude (differential) more desirable Hall signals. Connect capacitors between pins noise Hall signals causes problems.
Output current detection Connect resistor between this ground. output limitation maximum current, IOUT, 0.52/Rf this resistor.
This implements duty control using output signal PWM. These open collector sink outputs.
Outputs (Fixed current source outputs)
Power-supply voltage Connect capacitor between this ground power supply stabilization.
Continued next page.
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LB1821M
Continued from preceding page.
Functions Equivalent circuit
VREG
shunt regulator output
oscillator frequency setting
CROCK
Reference signal oscillator connection. This oscillator used motor constraint detection circuit, clock disconnection protection circuit, other circuits. protection operation time about seconds connecting capacitor about 0.047 between this ground.
Setting charge current used circuit Connect resistor between this ground. value that resistor must lower than
oscillator connection. This sets frequency. Connect capacitor between this ground. value capacitor that oscillator frequency does exceed MHz.
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LB1821M
Continued from preceding page.
Functions Equivalent circuit
input FILO filter amplifier output This connected circuit internally
FILI
filter amplifier inverting input This connected through 10-k resistor internally system output.
output
Torque command input This normally connected INT.OUT pin. When voltage falls, duties increased. apply voltage excess input from normal operational amplifier desirable.)
oscillation signals
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. 5686-16/16
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