LB8109M データシートの表示（PDF） - SANYO -> Panasonic

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LB8109M

Actuator Driver for Portable CD Players

SANYO -> Panasonic 

LB8109M

Supplementary Explanation

1. VCD supply

The VCD line is the power supply for the driver control blocks of channels 1 to 4. The VCD line can be supplied from the

DSP step-up circuit by using a coil with center tap (as shown in the Block Diagram).

However, because the allowable operating range for VCD is 3.6 V to 9.0 V, it is recommended that in order to reduce power

dissipation, the voltage should be set to the low end of this range. (Even if this power supply does not affect the control

performance such as the transfer gain.)

2. Sled step drive

Stepping control in this IC for the sled actuator is as described below. Normal V-type control is used if the SLMODE pin is

set high, but by setting this pin low it is possible to use step drive mode, which has a marked effect in reducing power

dissipation. (This only affects channel 4.)

The step drive starting level is input from the SLREF pin (only a voltage higher than ASPREF will be accepted), and the

positive side step start is determined by comparing the input voltage with IN4. For the negative side, the step start is

determined automatically by setting the differential voltage between the SLREF and the ASPREF on the opposite side, and

then comparing that voltage to IN4. In other words, the control characteristics become as defined by the solid line in the

diagram below. (The rise on the positive and negative steps has no hysteresis.)

Voltage between outputs

SLREF (greater than ASPREF)

If this voltage is set, the negative side step

start is determined automatically by setting the

differential voltage betwwen SLREF and

ASPREF on the opposite side as well.

No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment,

nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or

indirectly cause injury, death or property loss.

Anyone purchasing any products described or contained herein for an above-mentioned use shall:

1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors

and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and

expenses associated with such use:

2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO

ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally.

Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for volume

production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use

or any infringements of intellectual property rights or other rights of third parties.

This catalog provides information as of January, 1996. Specifications and information herein are subject to change without notice.

No.5233-9/9

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