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參數(shù)資料
| 型號： | LB8108M |
| 元件分類： | 運動控制電子 |
| 英文描述： | DISK DRIVE MOTOR CONTROLLER, 0.8 A, PQFP44 |
| 封裝： | QFP-44 |
| 文件頁數(shù)： | 1/12頁 |
| 文件大?。?/td> | 199K |
| 代理商： | LB8108M |
Ordering number : EN4946A
73196RM/51795TH (OT) No. 4946-1/12
Applications
The LB8108M is an actuator driver for use in portable CD
players that operate at a power supply voltage of 2.4 (two
nicad batteries) or 3.0 V (two dry-cell batteries).
Functions and Features
Includes four H bridge driver channels to drive the four
CD player actuators (focus coil, tracking coil, spindle
motor and sled motor).
(output dynamic range: maximum of about 2 V)
Includes a 3.9 V (typical) step-up circuit to supply the
DSP, ASP and microprocessor used in the CD player.
Also includes another voltage step-up circuit whose
voltage can be set with external resistors.
(However, note that the transistors, inductors, capacitors
and diodes required for drive operation are all external
components.)
Built-in oscillator circuit for these converters
(external resistor and capacitor required)
Detects the maximum value of the four driver outputs
and supplies a voltage slightly higher than that voltage
to the H bridge block in each of the four channels using
PWM voltage converter. This allows a drive scheme
with extremely low loss to be implemented.
(However, note that the pnp transistor, inductor,
capacitor, and diodes for the PWM circuit are all
external components.)
Built-in laser diode drive and APC circuits
(IOmax ≈ 100 mA. This function can be turned off by a
control voltage input. It is composed of step-up
converter and series regulator.
However, note that the transistors, inductors, capacitors
and diodes required for drive operation are all external
components.)
The sled motor drive circuit operates in 2 modes, that
are normal V-type drive mode and step drive mode
which is highly effective in reducing power dissipation.
A step-down converter that convert external input
voltage that exceed 5 V into 3.5 V VCC operates when
an external voltage input is applied. This simplifies
power supply design and thermal design for applying
VCC.
(This circuit turns on at the same time an external
voltage is applied and generates a 3.5 V VCC, which is
utilize for nicad battery charging.)
Built-in microprocessor reset circuit (external capacitor
required)
(This circuit detects the VCD pin voltage and operates a
reset voltage with an H-side of 2.2 V (typical) and an L-
side of 2.1 V (typical).)
Two built-in battery check comparator channels
System start and stop under microprocessor control
Actuator muting function included.
(all four channels at the same time)
Built-in thermal shutdown circuit
Package Dimension
unit: mm
3148-QFP44MA
SANYO: QIP44MA
[LB8108M]
LB8108M
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Actuator Driver for Portable CD Players
Monolithic Digital IC
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