Monolithic Digital LB1821M Power Brushless Motor Pre-Driver

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Monolithic Digital LB1821M Power Brushless Motor Pre-Driver

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Ordering number EN5686B
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: 3148A-QIP44M
[LB1821M]
13.2 10.0 (1.0) 13.2 0.35 10.0
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 constraint protection circuits, current limiter, thermal shutdown protection circuits.
2.8max (2.5)
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
SANYO products described contained herein have specifications that handle applications that require extremely high levels reliability, such life-support systems, aircraft's control systems, other applications whose failure reasonably expected result serious physical and/or material damage. Consult with your SANYO representative nearest before using SANYO products described contained herein such applications. SANYO assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications SANYO products described contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
33004TN (OT) 10803AS (OT) 63097HA(OT) 5686-1/16
LB1821M 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
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 Output low-level voltage Oscillator frequency Amplitude [CROCK Oscillator] Output high-level voltage VOH(RK)1 VOH(RK)2 VOH(CR)1 VOH(CR)2 VOL(CR)1 VOL(CR)2 (CR) V(CR)1 V(CR)2 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
Continued next page.
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LB1821M
Continued from preceding page.
Parameter Symbol VOL(RK)1 VOL(RK)2 ICHG1 ICHG2 (RK) V(RK)1 V(RK)2 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 VIO(INT) IB(INT) VOH(INT) VOL(INT) VB(INT) VCC/2 -0.4 4.05 3.25 1.85 1.25 IO(FGS) 4.35 3.55 2.15 1.55 +6.25 +0.4 4.65 3.83 2.45 1.85 Design target value Design target value 0.47 0.52 0.068 Conditions Ratings 0.57 Unit Vp-p Vp-p Vp-p
Output low-level voltage External capacitor charge current External capacitor discharge current Oscillator frequency Amplitude [VCO Oscillator] output high-level voltage 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] 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 Gain-bandwidth product Reference voltage
Continued next page. 5686-3/16
LB1821M
Continued from preceding page.
Ratings -0.4 0.35 0.24 0.35 0.24 0.35 0.24 Design target value Design target value 0.35 0.24 0.45 0.34 0.45 0.34 0.45 0.34 0.45 0.34 0.55 0.44 0.55 0.44 0.55 0.44 0.55 0.44 0.35 0.24 0.35 0.24 0.45 0.34 3.75 0.15 0.25 0.35 0.45 0.34 0.55 0.44 0.55 0.44 +0.4
Parameter [Filter Amplifier] Input bias current Output high-level voltage Output low-level voltage Reference voltage [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
Symbol
Conditions
Unit
IB(FIL) VOH(FIL) VOL(FIL) VB(FIL)1 VB(FIL)2 VOH(S/S) VOL(S/S) VIN(S/S)1 VIN(S/S)2 RU(S/S) VIH(F/R) VIL(F/R) VIN(F/R)1 VIN(F/R)2 RU(F/R) VIH(BR) VIL(BR) VIN(BR)1 VIN(BR)2 RU(BR) VIH(CLK) VIL(CLK)
VIN(CLK)1 Design target value VIN(CLK)2 Design target value RU(CLK) (CLK) VIH(N1) VIL(N1) VIN(N1)1 VIN(N1)2 RU(N1) VIH(N2) VIL(N2) VIN(N2)1 VIN(N2)2 RU(N2) VSDL VSDH
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
VREG
CROCK (frame)GND (frame)GND (frame)GND FILO FILI INTREF INTOUT
IN3+ IN2-21 IN2+ IN1-19 IN1+ GND(frame) GND(frame) GND(frame) FGIN+ FGIN-13 FGOUT FGSOUT
LB1821M
INTIN
DOUT
POUT
IN3-10
view
ILB00713
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LB1821M Sample Application Circuit
LB1821M
view
ILB00714
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LB1821M Internal Equivalent Circuit
CROCK
IN1-IN2-IN3-IN1+ IN2+ IN3+
HALL LOGIC DRIVER ROCK
LOGIC
INTOUT
COMP
CURR
INTIN
1.3VREF
INTREF POUT
LVSD
Speed control system
Speed discriminator
DOUT
FILTER
system system
FILO
VREG
FGIN- FGIN+
VREG
FILI
view
ILB00715
5686-7/16
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 unlocked 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)> 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 this function cleared about 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 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
ILB00716
5686-10/16
LB1821M Functions
Functions Equivalent circuit
INTOUT
Integrating amplifier output (speed control)
ILB00717
INTIN Integrating amplifier inverting input
INTREF
Integrating amplifier noninverting input potential VCC)
ILB00718
Speed discriminator output Outputs level over speed. Acceleration high, deceleration
DOUT
ILB00719
POUT
Speed control system output Outputs phase comparison result fCLK fFG.
ILB00720
Speed lock detection output Open collector output Goes when motor speed within speed lock range (±6.25%).
ILB00721
Continued next page.
5686-11/16
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
ILB00722
Forward/reverse control Low: High: open state functions high-level input. forward, high open reverse rotation. hysteresis about 0.45
ILB00723
External clock signal input Low: High: open state functions high-level input. hysteresis about 0.45 kHz, maximum
ILB00724
Start/stop control Low: High: VREG open state functions high-level input. start, high open stop mode operation. hysteresis about 0.45
ILB00725
Speed discriminator count switching Low: High: open state functions high-level input. hysteresis about 0.45
ILB00726
Continued next page.
5686-12/16
LB1821M
Continued from preceding page.
Functions Equivalent circuit
Speed discriminator count switching Low: High: open state functions high-level input. hysteresis about 0.45
ILB00727
FGSOUT amplifier output (after Schmitt circuit) This open collector output.
ILB00728
FGOUT
amplifier output This connected Schmitt comparator circuit internally
Schmitt comparator
ILB00729
FGIN-
amplifier inverting input
reset circuit FGIN+ amplifier noninverting input (1/2 potential) initial reset applied logic circuit block connecting external capacitor about between FGIN+ ground.
ILB00730
Ground connections These pins connected internally frame.
Continued next page.
5686-13/16
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.
ILB00731
Output current detection Connect resistor between this ground. output limitation maximum current, IOUT, 0.52/Rf this resistor.
ILB00732
This implements duty control using output signal PWM. These open collector sink outputs.
ILB00733
Outputs (Fixed current source outputs)
ILB00734
Power-supply voltage Connect capacitor between this ground power supply stabilization.
Continued next page.
5686-14/16
LB1821M
Continued from preceding page.
Functions Equivalent circuit
VREG
shunt regulator output
ILB00735
oscillator frequency setting
ILB00736
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.
ILB00737
Setting charge current used circuit Connect resistor between this ground. value that resistor must lower than
ILB00738
oscillator connection. This sets frequency. Connect capacitor between this ground. value capacitor that oscillator frequency does exceed MHz.
ILB00739
Continued next page.
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LB1821M
Continued from preceding page.
Functions filter amplifier output This connected circuit internally input Equivalent circuit
FILO
ILB00740
FILI
filter amplifier inverting input This connected through 10-k resistor internally system output.
output
ILB00741
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
ILB00742
Specifications SANYO products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer's products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer's products equipment. SANYO Electric Co., Ltd. strives supply high-quality high-reliability products. However, semiconductor products fail with some probability. possible that these probabilistic failures could give rise accidents events that could endanger human lives, that could give rise smoke fire, that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO products (including technical data, services) described contained herein controlled under applicable local export control laws regulations, such products must exported without obtaining export license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written permission SANYO Electric Co., Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO product that intend use. 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 March, 2004. Specifications information herein subject change without notice. 5686-16/16

Monolithic Digital LB1821M Power Brushless Motor Pre-Driver

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