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PDF LB8109M Data sheet ( Hoja de datos )
| Número de pieza | LB8109M | |
| Descripción | Actuator Driver for Portable CD Players | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number: EN5233
Monolithic Digital IC
LB8109M
Actuator Driver for Portable CD Players
Overview
The LB8109M is an actuator driver IC designed for portable
CD players that operate at 2.4 V (two Ni-Cd batteries) or 3.0 V
(two dry cells).
Package Dimensions
unit : mm
3148-QIP44MA
[LB8109M]
SANYO : QIP44MA
Functions and Features
. H bridge drivers (output dynamic range maximum is about 2 V) on chip for four channels to drive each CD actuator (the focus
. coil, the tracking coil, the spindle motor, and the sled motor).
Step-up circuit (voltage to be set by an external resistor) on chip that is used to apply voltage to the CD DSP, ASP and
microcontroller. Center-tap coil for step-up circuit makes it possible to supply the driver control voltage. (However, the drive Tr,
L, C, and Di are all external.)
. Oscillator circuits for each converter on chip. (C and R are external.)
. Four-channel driver control output is divided into two groups (the focus/tracking group and the spindle/sled group) for minimum
loss at double-speed play.
Higher operating voltage in each group is converted to power supply of each 2ch H bridge driver by PMW conversion.
. (However, the PWM PNP-Tr, NPN-Tr, L, C, and Di are all external.)
Sled motor driving mode is switchable between step drive mode for lower power dissipation, and normal V-type drive mode.
(The other three channels are fixed to V-type.)
. In the spindle motor drive circuit, the control gain can be doubled for double-speed play. (Switching port provided.)
. PWM step-down circuit for external power operates when external power (8 V or more) is supplied.
In this function, external power is converted to VCC power supply, and two type voltage setting is possible.
In play mode, step-up voltage for DSP has to be set lower than VCC, but in charging the battery, it has to be set higher than
VCC.
So step-down voltage (VCC) setting of two types is possible with two pairs of external resistor. (Switching port is provided.)
(However, the PWM PNP-Tr, NPN-Tr, L, C, and Di are all external.)
. Battery pulse charging function on chip. (However, the drive NPN-Tr, and the current feedback C and R are external.)
. Having one 358-type OP amplifier on chip, it is suitable for a variety of applications. (Power supply: VCD)
. The system can be started up and stopped by outputs from the microcontroller.
. Actuator muting function on chip (for all four channels simultaneously).
. Thermal shutdown circuit on chip.
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
13096HA (II) No.5233-1/9
1 page  
Pin Functions
Pin No.
1, 2
32, 33
Symbol
IN1, IN2
IN3, IN4
30 ASPREF
43, 42
41, 40
38, 37
36, 35
OUT1+, 1–
OUT2+, 2–
OUT3+, 3–
OUT4+, 4–
3 VOUT1
31 VOUT2
4 VCD
5 CHGDRV
10 EXTDRV
15 DNB-1
16 DNB-2
17 ASPDRV
LB8109M
Equivalent circuit
to
Function
Actuator control signals for each
driver:
IN1: Focus, IN2: Tracking,
IN3: Spindle, IN4: Sled.
These signals are input from the
ASP (DSP).
Control reference signal input pin
for each driver. This signal is
input from the ASP (DSP).
Constant current
value of each
Focus coil actuator drive output
pins.
Tracking coil actuator drive
output pins.
Spindle motor drive output pins.
Sled motor drive output pins.
(Each channel includes built-in
spark killer diodes.)
Power supply pins for the H
bridge driver. VOUT1 is for the
focus/tracking group and VOUT2
is for the spindle/sled group.
Maximum value + α (α :
saturation voltage of upper/lower
output Tr) of control output for
each 2CH is set by external
PWM step-down circuit.
Power supply for the actuator
driver controller, maximum value
circuit for PWM, sled controller,
and MUTE block.
Base drive output pin for the
external NPN-Tr for the battery
pulse charging circuit.
Base drive output pin for the
external step-down NPN-Tr used
when external voltage input is
applied.
Base drive output pin for the
PNP-Tr for the step-down PWM
that generates the power supply
for the H bridge driver that drives
the focus/tracking group
actuators.
Constant-current circuit which
changes with the input of CH1
through 4. (3 mA max)
Base drive output pin for the
PNP-Tr for the step-down PWM
that generates the power supply
for the H bridge driver that drives
the spindle/sled group actuators.
Base drive output pin for the
external NPN-Tr for the step-up
circuit that sets the external
voltage for the DSP.
Continued on next page.
No.5233-5/9
5 Page | ||
| Páginas | Total 9 Páginas | |
| PDF Descargar | [ Datasheet LB8109M.PDF ] | |
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