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
tracking coil,
motor, and the sled motor).
.
coil, the circuit (voltagethe spindleby an external resistor) on chip that is used to apply voltage to the CD DSP, ASP and
Step-up
to be set
.
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.
.
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.
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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 V
CC
power supply, and two type voltage setting is possible.
In play mode, step-up voltage for DSP has to be set lower than V
CC
, but in charging the battery, it has to be set higher than
V
CC
.
So step-down voltage (V
CC
) 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: V
CD
)
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
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