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| Ordering number :ENN6214A Monolithic Digital IC LB1971V Three-Phase Full-Wave Sensorless CD and MD Players Spindle Motor Driver Overview The LB1971V is a bipolar sensorless motor driver that provides a reverse torque braking function and is appropriate for use as the spindle motor driver in CD and MD players. Since the LB1971V can drive motors without the use of Hall elements, this device can contribute to miniaturization, thinner form factors, and lower power dissipation in end products. Package Dimensions unit: mm 3175A-SSOP24 [LB1971V] 24 13 1.0 5.6 0.1 0.43 1.6max 0.15 Functions and Features * * * * * * * Three-phase bipolar sensorless drive Soft switching drive technique Reverse torque braking Standby mode power saving function FG outputs Can be operated from a 3-V supply. Thermal protection circuit 1 8.0 12 0.22 0.65 SANYO: SSOP24 Specifications Absolute Maximum Ratings at Ta = 25C Parameter Maximum supply voltage 1 Maximum supply voltage 2 Maximum output circuit supply voltage Maximum output current Allowable power dissipation Operating temperature Storage temperature Symbol VCC1max VCC2max VS max IO max Pdmax Topr Tstg Conditions Ratings 7.0 7.0 7.0 700 0.4 -20 to +75 -55 to +150 Unit V V V mA W C C Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein. SANYO Electric Co.,Ltd. Semiconductor Company TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN 91099RM (OT) No. 6214-1/9 0.5 7.6 LB1971V Allowable Operating Ranges at Ta = 25C Parameter Supply voltage 1 Supply voltage 2 Output circuit supply voltage FG pin applied voltage FG pin output current Symbol VCC1 VCC2 VS VFG IFG Conditions Ratings 2.0 to 6.0 2.0 to 6.0 0 to VCC2 0 to 6.0 2.0 Unit V V V V mA Electrical Characteristics at VCC = 3.0 V, VS = 1.5 V, Ta = 25C Parameter [Current Drain] Power save mode current drain Operating current drain Pre-drive current Current drain + pre-drive current [Output Saturation Voltage] Source 1-1 Source 1-2 Source 2-1 Source 2-2 Sink 1 Sink 2 [STBY Pin] High-level input voltage Low-level input voltage High-level input current Low-level input current [BRAKE Pin] High-level input voltage Low-level input voltage High-level input current Low-level input current [Startup Oscillator] High-level output voltage Low-level output voltage [Position Detection Circuit] Offset voltage Common-mode input voltage range [FG Output Pin] Output saturation voltage [Thermal Protection Circuit] Operating temperature Hysteresis [CX Oscillator] High-level output voltage Low-level output voltage Oscillator frequency [SLOPE Circuit] Charge current Discharge current ICHG1 ICHG2 -6.0 3.0 -4.5 4.5 -3.0 6.0 A A VCXH VCXL fCX C = 470 pF 0.8 0.3 1.0 0.5 40 1.2 0.7 V V Hz TSD TSD Design target value Design target value 150 180 40 C C VFGSAT IFG = 0.4 mA 0.1 0.25 V VOFS VICM Design target value -10 0 +10 VCC2 - 1.5 mV V VOSCH VOSCL 1.35 0.50 1.50 0.65 1.65 0.80 V V VBRKH VBRKL IBRKH IBRKL VBRK = 3 V VBRK = 0 V -10 1.4 -0.1 60 VCC1 0.3 V V A A VSSH VSSL ISSH ISSL VSTBY = 3.0 V VSTBY = 0 V -10 1.4 -0.1 75 VCC1 0.3 V V A A Vsat1-1 Vsat1-2 Vsat2-1 Vsat2-2 Vsat3-1 Vsat3-2 IO = 0.4 A, VCC1 = VCC2 = VS IO = 0.2 A, VCC1 = VCC2 = VS IO = 0.4 A, VCC1 = VCC2 =3V, VS = 1.5 V IO = 0.2 A, VCC1 = VCC2 =3V, VS = 1.5 V IO = 0.4 A IO = 0.2 A 0.90 0.85 0.25 0.15 0.20 0.13 1.00 0.95 0.35 0.25 0.35 0.25 V V V V V V ICC1-1 ICC1-2 ICC2 ICC1+2 STBY mode IO = 20 mA IO = 20 mA IO = 20 mA 3.6 0.4 4.0 5 4.6 1.0 5.5 A mA mA mA Symbol Conditions Ratings min typ max Unit No. 6214-2/9 LB1971V Pin Assignment 24 23 22 21 20 19 18 17 16 15 14 13 WOUT FCOM OSC LB1971V UOUT VOUT VCC2 CSLP1 11 1 2 3 4 5 6 7 8 9 10 12 Pd max -- Ta Allowable power dissipation, Pdmax -- W 0. 5 0. 4 0. 3 0. 24 0. 2 0. 1 0 -20 0 20 40 60 80 100 120 Ambient temperature, Ta -- C CSLP2 VCC1 STBY BRK FG FC DET VS GND NC RF WIN VIN NC UIN NC CX Top view No. 6214-3/9 LB1971V Application Circuit Example 1: Portable CD Player (maximum speed: about 1000 rpm) 4700 p 4700 p 4700 p 0.47 0.25 1.5 M 470 p 24 RF 23 WOUT 22 NC 21 FCOM 20 UIN 19 VIN 18 WIN 17 OSC 16 NC 15 NC 14 CX 13 GND 12 CSLP2 0.047 470 p LB1971V CSLP1 11 14 CX UOUT VOUT VCC1 VCC2 STBY BRK DET 10 FG VS FC 9 1 2 3 4 5 6 7 20 K 8 + 1 + 0.047 0.047 47 STBY BRK VS VCC FG Unit (resistance: , capacitance: F ) Application Circuit Example 2: Portable MD Player (maximum speed: about 2000 rpm) 2200 p 2200 p 2200 p 0.22 0.25 1.5 M 24 RF 23 WOUT 22 NC 21 FCOM 20 UIN 19 VIN 18 WIN 17 OSC 16 NC 15 NC 13 GND 12 CSLP2 0.022 LB1971V CSLP1 11 UOUT VOUT VCC1 VCC2 STBY BRK DET 10 FG VS FC 9 1 2 3 4 5 6 7 20 K 8 + 1 + 0.047 0.022 47 STBY BRK VS VCC FG Unit (resistance: , capacitance: F ) No. 6214-4/9 LB1971V Notes on the LB1971V and External Components 1. Three-phase full-wave sensorless drive The LB1971V is a 3-phase full-wave sensorless motor driver that provides a reverse torque braking function and is appropriate for CD and MD players spindle motor drive. Furthermore, since this driver does not require the use of Hall-effect devices, it can contribute to miniaturization, thinner form factors, and lower power in the motor system. 2. Power supply This IC uses 3 power supply systems: VS, VCC1, and VCC2. VS is connected to the motor drive transistors, and allows motor speed control to be implemented by connecting a power supply that varies according to the speed control. Since VCC2 is connected to the pre-drive circuit and the position detection comparator circuit, the SOURCE pin output can be made to have a low saturation voltage and a highly efficient motor operation can be achieved by maintaining the condition that VS VCC2 - 1 V. Also note that while this IC can be operated from voltages as low as VCC1 = VCC2 = 2 V, the common-mode input voltage range of the position detector becomes quite narrow at this low voltage, and care is required with respect to the applied VS voltage. Capacitors with an adequate capacitance for stability must be inserted between each of the power supplies and ground. 3. Soft switching drive This IC adopts a soft switching drive technique to minimize motor noise. When the output transistors switch between phases, a two-phase excitation state is created, and the output current is switched gradually to suppress motor noise. The two-phase excitation state is determined by the amplitude of the CSLP pin waveform, and that waveform amplitude is determined by the value of the capacitor connected at the CSLP pin and the motor speed. Note that while the soft switching operation increases as the amplitude of the CSLP pin voltage decreases, drive efficiency is reduced and timing problems may occur if this amplitude becomes too small. Therefore, the CSLP pin amplitude should be at least 200 mVp-p at the maximum motor speed. 4. Position detection comparator circuit The position detection comparator circuit uses the back EMF generated during motor rotation to detect the position of the rotor. The position information acquired by this circuit is used to determine to which sections of the output block power will be applied. Problems that occur during startup due to noise in the VS line can be prevented by inserting capacitors between the FCOM pin and the UIN, VIN, and WIN pins. However, the timing with which power is applied during high-speed motor operation may be delayed and efficiency reduced if these capacitors are too large. 5. Startup oscillator circuit (OSC pin) This oscillator circuit creates the commutation logic timing required to start a sensorless motor. A capacitor and a resistor are connected in parallel to ground. Use a high resistance of about 1.5 M for this resistor. The value of the capacitor depends on the characteristics of the motor: select a value such that the time required to reach the target speed is minimum and the variation in the startup time is as small as possible. If the capacitance is too large, the variations in startup time will increase, and if it is too small the motor may be prevented from starting up normally. 6. CX oscillator circuit This oscillator circuit creates the reference clock used for the sensorless motor logic system. Insert a capacitor to ground. The oscillator frequency increases as the capacitance decreases. The oscillator frequency must be less than 60 Hz. (The recommended capacitance is 470 pF.) 7. FG output circuit The FG output is created from the position detection information acquired from the back EMF waveform. This output has a frequency three times that of the switching frequency. The output circuit is an open collector circuit. The output is pulled up with a resistor. No. 6214-5/9 + VCC1 VCC2 + PWM VS + Block Diagram FG WV U UIN Output drive circuit Soft switching drive Sensorless logic VIN U V W Rf FCOM LB1971V WIN FCOM BRK SLOPE BRK Envelope detector CX TSD OSC STBY BGP CX CSLP1 CSLP2 FC OSC STBY DET GND No. 6214-6/9 LB1971V Pin Functions Pin No. Symbol Pin voltage Function Equivalent circuit 2 1 23 UOUT VOUT WOUT VS * U, V, and W phases coil outputs 2 1 23 VCC1 24 RF * Rf connection The LB1971V implements current control using a resistor (Rf) connected between this pin and ground to detect the drive current. 24 VCC1 3 STBY 0 to VCC1 * Standby control Normal operation: High Standby: Low or open 30 k 3 70 k VCC1 4 BRK 0 to VCC1 * Forward/reverse torque switching Forward torque: Low or open Reverse torque: High 330 4 50 k 5 VCC1 2.0 V to 6.0 V * Power supply connection 6 VS 0 V to VCC2 * Motor drive and speed control blocks power supply The voltage applied to this pin must be strictly lower than VCC2. * Power supply connection for the predrive circuit and the motor back EMF detection comparator circuit 7 VCC2 2.0 V to 6.0 V VCC1 8 8 FG * FG output These are open collector output. Continued on next page. No. 6214-7/9 LB1971V Continued from preceding page. Pin No. Symbol Pin voltage Function VCC1 Equivalent circuit 9 FC * Frequency characteristics determination Closed loop oscillation of the current control system can be stopped by connecting a capacitor between this pin and ground. 2 k 9 VCC1 10 DET * Drive waveform sink side envelope detection Nothing connected to this pin in normal operation. 1 k 1 k 1 k 30 k 1 k 2 1 23 10 VCC1 11 12 CSLP1 CSLP2 * Connection for the capacitor used for triangular wave generation The soft switching operation of the coil output waveform is created using this triangular waveform. 1 k 11 12 13 GND *Ground VCC1 14 CX * Clock oscillator used by the sensorless logic Connect a capacitor between the CX pin and ground. Oscillator frequency must be set up to 60 kHz. 1 k 14 15 16 22 NC * Unused Continued on next page. No. 6214-8/9 LB1971V Continued from preceding page. Pin No. Symbol Pin voltage Function Equivalent circuit 17 OSC * Connection for the triangular waveform oscillator capacitor. This waveform is used to generate the forcible motor startup waveform during motor startup. Connect a capacitor and a resistor between this pin and ground. Capacitance required depends on the characteristics of motor. Use a capacitor so that the time interval until when the motor rotation reaches the desired speed becomes the shortest. VCC1 1 k 17 18 20 19 WIN UIN VIN * Inputs to the motor back EMF detection comparator These pins are connected to the output pins via a resistor internally in the IC. Connect capacitors between these IN pins and their corresponding -FCOM. VCC1 2 1 23 20 19 18 10 k 200 200 21 21 FCOM * Motor coil midpoint input The back EMF output is detected by refering to these voltages. Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment. SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design. In the event that any or all SANYO products (including technical data, services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties. This catalog provides information as of September, 1999. Specifications and information herein are subject to change without notice. PS No.6214-9/9 |
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