Datasheet LB8118M Datasheet (SANYO)

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Ordering number: EN*5825

Preliminary

Monolithic Digital IC

LB8118M

Actuator Driver for Portable CD Players

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.

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 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 V In playback mode, step-up voltage for DSP has to be set equal to or lower than V higher enough than V So step-down voltage (V (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.

) setting of two types is possible with two pairs of external resistor. (Switching port is provided.)

power supply, and two type voltage setting is possible.

Package Dimensions

unit : mm

3148-QFP44MA

[LB8118M]

, but in charging the battery, it has to be set

SANYO : QIP44MA

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

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LB8118M

Specifications

Absolute Maximum Ratings atTa=25°C

Parameter Symbol Conditions Ratings Unit Maximum supply voltage V V

pin input voltage VCDmax 10 V

H bridge output current I Allowable power dissipation Pd max Independent IC 700 mW Operating temperature Topr –20 to +75 Storage temperature Tstg –55 to +150

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions Ratings Unit Supply voltage V V

pin input voltage V

drop setting voltage when

external voltage input is applied H Bridge limiter voltage V

max 7V

max Maximum per channel is 400 mA. 800 mA

OUT

CC CD

CC(EXT)

lim 0.15 to 2.25 V

1.6 to 5.0 V

3.6 to 9.0 V

3.0 to 5.0 V

Electrical Characteristics atTa=25°C, VCC=3V,VCD=4V

Parameter Symbol Conditions min typ max Unit

[Power Supply Block]

Standby current drain I V

quiescent current drain I

CCO

CC CD

[ASP step-up circuit]

ASP drive output current I V

pin input bias current I

ASP

ASPBASE pin saturation voltage

Load regulation R Line regulation R Minimum off duty D

O ASPDRV

B VASP

O ASPBASEIO

LD ASP LN ASP

min ASP

[APC step-up circuit]

APC drive output current I V

pin input bias current I

APC

APC–VLD

voltage V Load regulation R Line regulation R Minimum off duty D

O APCDRV

B VAPC

APC

LD APC LN APC

min APC

[H Bridge Output Block, PWM Block]

Output saturation voltage V Maximum output voltage V PWM applied offset voltage V

H sat

PWM

PWMOFF

DNB – 1,2 pins output current Io DNB1,2 V Load regulation R Line regulation R

LD PWMVOUT LN PWMVOUT

[Drive Control Block]

CH1 to 4 input voltage range V Input bias current I ASP REF input voltage range V

IN1–4

BIN

ASPR

CH1,2,4 transfer gain G124 CH3 L side transfer gain G3L Negative/positive transfer gain

difference Input dead zone voltage range V

∆G

S/S = [H], the total of VCCand V

S/S = [L], VCCline only 11.0 mA S/S = [L], with no driver input 4.0 mA

= 1 mA 0.2 V

= 3.4 V, L = 30 µH, C = 220 µF 1000 mV/A

ASP

= 3.4 V, L = 30 µH, C = 220 µF 100 mV/V

ASP

– LD 0.5 V

= 3.4 V, L = 30 µH, C = 220 µF 1000 mV/A

APC

= 3.4 V, L = 30 µH, C = 220 µF 100 mV/V

APC

IO= 200 mA, TOP + BOTTOM 0.30 0.45 V

max V

1 2.25 V

OUT

Each VIN=V

ASPREF

= 2.25 V, L = 30 µH 1000 mV/A = 2.25 V, L = 30 µH 100 mV/V

0.5 VCD–0.5 V Each VIN=V Each VIN=V RL=10Ω 7.95 dB

RL=10Ω 10.0 dB

RL=10Ω –1.0 0 +1.0 dB

ASP REF ASP REF

1.2 VCD–1.3 V

RL=10Ω 0 0 30 mV

100 µA

2.0 mA 200 nA

50 %

0.5 mA 200 nA

50 %

0.17 V /60 mA

OUT

2.0 µA

Continued on next page.

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LB8118M

Continued from preceding page.

Parameter Symbol Conditions min typ max Unit

[SLED Drive Circuit]

SL REF pin input voltage range

SL REF pin input bias current I Positive side setting offset

voltage between IN4 and SL REF

Dual side step width difference voltage

SL MODE pin high voltage V SL MODE pin low voltage V

[OSC Block]

Maximum oscillation frequency F Input bias current I

[S/S Pin Function]

S/S start voltage V S/S off voltage V

[External Voltage Input Block]

Minimum operating input voltage when external voltage input is applied

EXTDRV pin output current I VZ pin voltage V VZ pin inflow current I V

EXT,VEXT

Input bias current

-CHG pin

EXTBASE pin saturation voltage

[Muting Block]

Mute on voltage V Mute off voltage V

[Pulse Charging Function]

Internal reference voltage V CHG-ON pin ON voltage V CHG-ON Pin OFF voltage V CHG-MON pin

input bias current

CHGDRV pin output current I [H Bridge 1-channel/2-channel drive switch] 1-channel/2-channel switching,

2-channel on voltage 1-channel/2-channel switching,

1-channel on voltage [TSD Block]

Operating temperature T

Temperature hysteresis width ∆T [Battery Check Block] Input bias current I Output saturation voltage V

Note 1: For parameters which have an entry of ‘‘design target value’’ in the ‘‘Conditions’’ column, no measurements are made.

SL REF

B SL REF

off SL REFVSL REF

SL DIF

H SL MODE

L SL MODE

OSC max

B OSC

ON VCC–1.0 V

OFF 0.5 V

EXT

O EXT DRV

B EXTCHG

B EXT

EXTBASEIO

ON MUTE

OFF MUTE

CHG REF

CHG-ON

CHG-OFF

B CHG MON

O CHG DRV

1ch/2ch 1.0 V

1ch/2ch 2.0 V

TSD

BIN

min RIN=1kΩ 3.5 V

Design target value, Note 1 180 Design target value, Note 1 20

IO= 100 µA 0.3 V

= 2.3 V, V

SL REF

= 4.5 V, RIN=1kΩ 3.0 V

EXT

ASP REF

= 2 V –20 +20 mV

= 2 V –20 +25 mV

= 1 mA 0.2 V

ASP REF

+0.1 VCD–1.0 V

2.0 V

–25 +1.0 V

–2.0 µA

200 µA

2.0 V

0.3 V

2.0 V

3.0 mA

200 nA

100 kHz

20 mA

200 nA

1.0 V

200 nA

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Pin Assignment

LB8118M

Pd max – Ta

Allowable power dissipation, Pd max – W

Ambient temperature, Ta –°C

1ch/2ch

APC

OSET

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LB8118M

Pin Functions

Pin No. Symbol Equivalent circuit Function

1, 2

32, 33

IN1, IN2 IN3, IN4

Actuator control signals for each driver: IN1: Focus, IN2: Tracking, IN3: Spindle, IN4: Sled. These signals are input from the

ASP (DSP).

30 ASP

REF

Control reference signal input pin for each driver. This signal is input from the ASP (DSP).

43, 42

41, 40

38, 37 36, 35

+,1–

OUT1

OUT2+,2

OUT3+,3 OUT4+,4

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.)

V V

OUT OUT

1 2

Power supply pins for the H bridge driver. V

focus/tracking group and V

OUT

1 is for the

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.

5 CHGDRV

Base drive output pin for the external NPN-Tr for the battery pulse charging circuit.

9 EXTDRV Base drive output pin for the

external step-down NPN-Tr used when external voltage input is applied.

14 DNB-1 Base drive output pin for the

Constant current value of each

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.)

15 DNB-2 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.

Constant-current circuit which changes with the input of CH1 through 4. (3 mA max)

(DNB-2 becomes the drive pin when there is one H bridge power supply.)

17 ASPDRV Base drive output pin for the

external NPN-Tr for the step-up circuit that sets the external voltage for the DSP.

24 APCDRV Base drive output pin for

external NPNTr for the laser diode APC power supply.

OUT

Continued on next page.

No.5825-5/11

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LB8118M

Continued from preceding page.

Pin No. Symbol Equivalent circuit Function

6 CHG MON

12 EXTBASE Connection pin for the resistor

7 GND LB8118M GND pin for

8 OSC

Constant-current feedback input pin for the charging circuit. The charging current is determined by comparing this input voltage and the internal reference voltage (0.35 V typ.).

that is used to set the voltage for the external step-down circuit. This prevents invalid current at no power supply.

small-signal block. (GND except output power Tr)

Input pin for the free-running oscillation circuit that is used to operate the PWM step-down circuit and step-up circuit. The oscillating frequency is determined by external capacitors.

10 V

EXT

Voltage feedback input pin for the external power supply step-down circuit. VCCfor

playback is set by comparing this pin voltage with the internal reference voltage (1.28 V typ.).

11 V

EXTCHG

Voltage feedback input pin for the external power supply step-down circuit. V

charging is set by comparing this

for

pin voltage with the internal reference voltage (1.28 V typ.).

18 V

ASP

Voltage feedback input pin for the step-up circuit. The step-up voltage is determined by comparing this pin voltage with the internal reference voltage (1.28 V typ.).

19 UPBASE Connection pin for the resistor

that is used to set the voltage of the step-up circuit. This prevents invalid current in standby mode.

20 VZ

Input pin for start-up circuit when an external voltage input is

Reference voltage startup circuit

External power input Forced startup

applied. The external voltage input is applied through a resistor inserted in series. The voltage is basically determined

1.2V + 2V current draining capacity up to

; this pin has a

20 mA.

27 S/S LB8118M start-up input. (Start

on a low-level input.)

Continued on next page.

No.5825-6/11

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LB8118M

Continued from preceding page.

Pin No. Symbol Equivalent circuit Function

23 V

Laser diode voltage detection pin. The V

APC

voltage +0.5 V is

24 V

APC

Voltage feedback input pin for the APC step-up voltage circuit. The step-up power supply voltage is determined by comparing this input voltage with V

16 Voset

13 CHG-ON

To next block

H bridge power supply limiter voltage pin for the V

The voltage is limited at approximately 190% of the V

voltage. The setting is made

SET

OUT

2 side.

by a dividing resistor.

Pin for selecting battery charging when external voltage input is applied. This pin is used to determine the drop voltage for the external voltage input. When low, the drop voltage set by VEXT is selected; when high, the drop voltage set by VEXT-CHG is selected.

28 MUTE Input pin for simultaneously

muting the four- channel drivers. (Low level: mute)

44 1ch/2ch This pin is used to switch the H

bridge power supply between two-channel simultaneous operation and one-channel operation. (Two-channel operation is selected when this pin is low.)

34 SLMODE Pin for switching the sled driver

between V-type control and step control. (High: V-type control;

low: step control) 26 V 29

SLREF IN4

Power supply voltage pin.

Threshold input pin for driving

the sled motor stepwise. Both

the positive and negative step

levels (with positive-negative

symmetry) are determined by the

voltage differential between the

pin voltage and the ASPREF pin

voltage. (See Supplementary

Explanation)

39 PGND Output Tr. GND for the four-

channel H bridge drivers. This

pin is not internally connected to

the small-signal system GND.

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LB8118M

Continued from preceding page.

Pin No. Symbol Equivalent circuit Function

21 BO

Battery check comparator output.

Internal output current is 100 µA.

22 BI

Battery check comparator input.

Input bias current is 200 nA or

less.

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LB8118M Block Diagram

LB8118M

Start-up

Bidirectional

drive

Maximum

Bidirectional

value

Inverted output

drive

1ch/2ch switch

Error amplifier

Offset

Clamp +

Error amplifier

Offset

Clamp +

Bidirectional

drive

Clamp +

Offset

oscillation circuit

Sawtooth waveform

Error amplifier

Dead time

Bidirectional

drive

ASP (3.3V) UP CONVERTER

DC/DC

Converter

See

Sample

Application

To microcontroller

APC Drive

Error amplifier

Dead time

Error amplifier

APC (2.5 V) UP CONVERTER

Judge ext.

power

Forced startup

Error amplifier

Dead time

External power

No.5825-9/11

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LB8118M Sample Application Circuit

LB8118M

(Ceramic)

D879 Low saturation Tr B1302 Low saturation type (for SW) Coil manufactured by Toko

Figure 1 DC 2.6 V Up/down Sample Application

Unit (resistance: Ω)

Coil: Manufactured by Toko NPN Tr: D1012

2.5VtoV Unit (resistance: Ω)

Figure 2 DC 3.5 V Sample Application (when laser power supply is VDD)

No.5825-10/11

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Supplementary Explanation

LB8118M

1. V

The V

supply

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 V

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