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PDF LB1971V Data sheet ( Hoja de datos )
| Número de pieza | LB1971V | |
| Descripción | Three-Phase Full-Wave Sensorless CD and MD Players Spindle Motor Driver | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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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.
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
Specifications
Absolute Maximum Ratings at Ta = 25°C
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
Package Dimensions
unit: mm
3175A-SSOP24
[LB1971V]
24 13
1 12 0.15
8.0
0.22 0.65 0.43
SANYO: SSOP24
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
1 page  
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 MΩ 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
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LB1971V.PDF ] | |
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