LB8109M Datasheet, PDF (1/9 Pages) Sanyo Semicon Device – Actuator Driver for Portable CD Players

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 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: 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.}
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