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PDF LB8118M Data sheet ( Hoja de datos )

Número de pieza LB8118M
Descripción Actuator Driver for Portable CD Players
Fabricantes Sanyo 
Logotipo Sanyo Logotipo



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No Preview Available ! LB8118M Hoja de datos, Descripción, Manual

Ordering number: EN*5825
Monolithic Digital IC
LB8118M
Actuator Driver for Portable CD Players
Preliminary
Overview
The LB8118M 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). Because the four-channel driver control outputs
are divided into two groups, this device reduces power
dissipation considerably during double-speed play.
Package Dimensions
unit : mm
3148-QFP44MA
[LB8118M]
Functions and Features
SANYO : QIP44MA
. 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 is 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 playback. Highest operating voltage detected in each group is supplied for each 2ch H bridge driver after
PMW conversion. The single channel PWM drive without dividing the outputs into two groups is also possible. (However, the
. PWM PNP-Tr, NPN-Tr, L, C, and Di are all external.)
The dynamic range of 4-channel H bridge driver output voltage is up to 2 V on the focus and tracking side, and can be set by
the Vosat pin on the spindle and sled side. However, if the 4-channel H bridge voltages in the H bridge driver block are the
. same, the maximum voltage is determined using the Voset pin.
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 set higher for double-speed playback.
. PWM step-down circuit for external power operates when external power (4 V or higher) is supplied.
In this function, external power is converted to VCC power supply, and two type voltage setting is possible.
In playback mode, step-up voltage for DSP has to be set equal to or lower than VCC, but in charging the battery, it has to be set
higher enough 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.)
APC step-up power supply for the laser diode. (Also supports a pre-power supply for the internal bias.) The laser diode is
controlled with a voltage of roughly 0.5 V.
. Battery pulse charging function on chip. (However, the drive NPN-Tr, and the current feedback C and R are external.)
. Battery check comparator on chip.
. 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
D3097HA (II) No.5825-1/11

1 page




LB8118M pdf
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
9 EXTDRV
14 DNB-1
15 DNB-2
17 ASPDRV
24 APCDRV
LB8118M
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 each 2-channel
control output is set by external
PWM step-down circuit.
Power supply for the actuator
driver controller, maximum value
circuit for PWM, and sled
controller.
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. (Open when there is
one H bridge power supply.)
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.
(DNB-2 becomes the drive pin
when there is one H bridge
power supply.)
Base drive output pin for the
external NPN-Tr for the step-up
circuit that sets the external
voltage for the DSP.
Base drive output pin for
external NPNTr for the laser
diode APC power supply.
Continued on next page.
No.5825-5/11

5 Page





LB8118M arduino
LB8118M
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 or ASP 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 lower 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 selected if the SLMODE pin
is set high, but by setting this pin low step drive mode with low power dissipation can be selected. (This only affects channel
4.)
The step drive starting level is input from the SLREF pin (must be higher than ASPREF), 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 December, 1997. Specifications and information herein are subject to change without notice.
No.5825-11/11

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