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PDF LV8223T Data sheet ( Hoja de datos )
| Número de pieza | LV8223T | |
| Descripción | Motor driver system | |
| Fabricantes | Sanyo | |
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Ordering number : ENN7812
SANYO Semiconductors
DATA SHEET
LV8223T
Bi-CDMOS IC
Motor driver system in CD and MD players
Overview
The LV8223T is a system driver IC that can implement, with a single chip, all the motor driver circuits required in CD
and MD drives. The LV8223T provides three-phase PWM spindle, three-phase sled, focus, and tracking drivers. Since
it integrates lifting drivers (three PWM H bridge channels) and one half-bridge channel on the same chip, it can
contribute to further miniaturization, thinner form factors, and lower power in end products. The spindle motor driver
adopts a direct PWM sensorless drive technique for highly efficient motor drive requiring a minimal number of external
components.
Functions
• PWM H bridge motor drivers (3 channels)
• Three-phase stepping motor driver
• Half-bridge driver
• Direct PWM sensorless motor driver
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Supply voltage
Output block supply voltage
Predriver voltage (gate voltage)
Output current
Allowable power dissipation 1
Allowable power dissipation 2
Operating temperature
Storage temperature
Symbol
VCC max
VS max
VG max
IO max
Pd max1
Pd max2
Topr
Tstg
Conditions
Independent IC
Mounted on a 50 × 50 × 1.6 mm glass epoxy
PCB (reference value)
Ratings
5.0
4.5
6.5
0.7
0.45
1.25
–20 to +85
–55 to +150
Unit
V
V
V
A
W
W
°C
°C
Recommended Operating Conditions at Ta = 25°C
Parameter
Supply voltage
Output block supply voltage
Predriver voltage (gate voltage)
Symbol
VCC
VS
VG
Conditions
Ratings
2.1 to 4.0
0 to VG – 3.0 < VCC
VS + 3 to 6.4
Unit
V
V
V
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
52504TN (OT) No.7812-1/14
1 page  
Pin Function
Pin No. Pin Name
Pin Description
1 SPGND Spindle output block ground
LV8223T
Equivalent circuit
2
2
SPVS
Spindle motor driver power supply.
Insert a capacitor between this pin and ground.
63 61 60
1
63
61
60
UOUT
VOUT
WOUT
Outputs. Connect these pins to the spindle motor
coils.
62 COM Spindle motor common point connection
Spindle motor position detector comparator filter
3 FIL connection. Insert a capacitor between this pin and
the COMIN pin (pin 4).
Spindle motor position detector comparator
4 COMIN differential input. Insert a capacitor between this pin
and the FIL pin (pin 3).
VCC
VG
600 Ω
62 3
6 kΩ
6 kΩ
5, 6
64
SGND
TGND
Small signal system ground
600 Ω
12 kΩ
4
VCC
VCO oscillator connection. Insert a capacitor
7 VCO between this pin and ground. The VCO oscillator
frequency follows the speed of the spindle motor.
500 Ω
7
500 Ω
Continued on next page.
No.7812-5/14
5 Page 
LV8223T
LV8223T Functional Description and Notes on External Components
The LV8223T is a system driver IC that implements, in a single chip, all the motor driver circuits required for CD and
MD players. Since the LV8223T provides a spindle motor driver, a three-phase sled stepping motor driver, three H
bridge drivers for the focus, tracking, and head up/down actuators, and a single half bridge motor driver channel, it can
contribute to thinner form factors and further miniaturization in end products. Since the spindle motor driver uses a
direct PWM sensorless drive technique, it achieves high-efficiency motor drive with a minimal number of external
components.
Read the following notes before designing driver circuits using the LV8223T to design a system with fully satisfactory
characteristics.
Output Drive Circuit and Speed Control Methods
The LV8223T adopts the synchronous commutation direct PWM drive method to minimize power loss in the output
circuits. Low on-resistance DMOS devices (total high and low side on-resistance: 0.8 Ω, typical) are used as the output
transistors.
The spindle motor driver speed is controlled by BRK and PWM signals provided by an external DSP. The PWM signal
controls the sink side transistor. That transistor is switched according to the input duty of the signal input to the PWM
pin (pin 15) to control the motor speed. (The sink side transistor is on when the PWM input is high, and off when the
PWM input is low.)
Soft Switching Circuit
This IC uses variable duty soft switching to minimize motor drive noise. An excitation current on/off dual-sided soft
switching technique is used for this soft switching.
Note that the LV8223T does not use soft switching drive, but instead uses hard switching drive, if it is not supplied with
a CLK signal from the DSP. In this operating mode, the CLK signal is provided by an internal oscillator circuit.
VCO Circuit Constants
The LV8223T spindle block adopts a sensorless drive technique. Sensorless drive is implemented by detecting the back
EMF signal generated by the motor and setting the commutation timing accordingly. Thus the timing control uses the
VCO signal. We recommend using the following procedure to determine the values of the VCO circuit’s external
components.
1. Connect components with provisional values.
Connect a 2.2 µF capacitor between the VCOIN pin (pin 9) and ground, connect a 68 kΩ resistor between the RMAX
pin (pin 8) and ground, and connect a 3300 pF capacitor between the VCO pin (pin 7) and ground.
2. Determine the value of the VCO pin (pin 7) capacitor.
Select a value such that the startup time to the target speed is the shortest and such that the variations in startup time
are minimized. If the value of this capacitor is too large, the variations in the startup time will be excessive, and if too
small, the motor may fail to turn. Since the optimal value of the VCO pin constant differs with the motor
characteristics and the startup current, the value of this component must be verified again if the motor used or any
circuit specifications are changed.
3. Determine the value of the RMAX (pin 8) resistor.
Select a resistor value such that the VCOIN pin voltage is about VCC – 1.0 V or lower with the motor operating at the
target speed. If the value of this resistor is too large, the VCOIN pin voltage may rise excessively.
4. Determine the value of the VCOIN pin (pin 9) capacitor.
If the FG output (pin 48) pulse signal becomes unstable at the lowest motor speed that will be used, increase the
value of the VCOIN pin capacitor.
5. Determine the value of the resistor connected between the VCOIN pin (pin 9) and ground.
When intermittent drive (free-running deceleration) using the S/S and MUTE pins is used to reduce system power
consumption and the system locks up on restart, a large resistor (several MΩ) must be connected to discharge the
capacitor connected to the VCOIN pin.
Choose a value for this resistor such that the time for complete discharge is longer than the motor free-running
deceleration time. Note that if an oscilloscope probe is attached to the VCOIN pin when determining the value of this
constant, the discharge characteristics will differ due to the probe impedance. This issue requires care when testing in
an actual system. (We recommend using an FET probe.)
(Reason that a discharge resistor is required when the locked state occurs: Since the commutation timing in
sensorless drive is determined by detecting the back EMF signal generated by the motor, the timing and other aspects
are controlled based on the VCO signal. Therefore, the VCO control voltage is generated according to the speed of
No.7812-11/14
11 Page | ||
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