Datasheet LB8109M Datasheet (SANYO)

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Page 1

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 In play mode, step-up voltage for DSP has to be set lower than V V

So step-down voltage (V (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.

) 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.

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

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13096HA (II) No.5233-1/9

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LB8109M

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 Independant 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

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

max 7V

max Maximum per channel is 400 mA. 800 mA

OUT

CC CD

CC(EXT)

1.6 to 5.0 V

3.6 to 9.0 V

3.0 to 5.0 V

Parameter Symbol Conditions min typ max Unit

[Power Supply Block]

Standby current drain I V

no-signal current drain I

CCO

CC CD

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

S/S = [L], VCCline only 7.0 10.0 mA S/S = [L], with no driver input 5.0 8.0 mA

[Externally set step-up circuit]

ASP drive output current I Reference voltage of step-up

circuit

pin input bias current I

ASP

UPBASE pin saturation voltage

Load regulation R Line regulation R Minimum off duty D

O ASPDRVVASP

ref ASP

B V ASP

O UPBASEIO

LD ASP LN ASP

min ASP

= 1 V 2.2 2.8 3.4 mA Determined at ASP drive pin 1.23 1.28 1.33 V V

= 1.5 V 200 nA

ASP

= 1 mA 0.2 V

= 3.5 V, L = 30 µH, C = 220 µF 1000 mV/A

ASP

= 3.5 V, L = 30 µH, C = 220 µF 100 mV/V

ASP

[S/S Pin Function]

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

ON VCC–1.0 V

OFF VCC–0.5 V

[H Bridge Output Block, PWM Block]

Output saturation voltage V V

pin maximum output

OUT

voltage

PWM applied offset voltage V

H sat

OUT

PWMOFF

IO= 200 mA, TOP + BOTTOM 0.30 0.45 V

max 2.25 V

At mute state (each output = 0) 0.23 0.26 0.29 V

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

LDVOUTVOUT LNVOUTVOUT

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

[Drive Control Block]

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

IN1–4 ASPR

BIN off IN

CH1,2,4 transfer gain G124 CH3 L side transfer gain G3L CH3 H side transfer gain G3H

Each VIN=V V

ASP REF

RL=10Ω 7.1 8.3 9.5 dB

RL=10Ω 13.6 14.8 16.0 dB

ASP REF

= 2 V –30 +30 mV

= 2 V 2.0 µA

0.5 VCD–0.5 V

1.2 VCD–1.3 V

20 µA

20 %

/600 A

OUT

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LB8109M

Continued from preceding page.

Parameter Symbol Conditions min typ max Unit

Negative/positive transfer gain difference

Input dead zone voltage range V G-SELECT pin low-gain side

selection voltage G-SELECT pin high-gain side

selection voltage

[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

[Muting Block]

Mute on voltage V Mute off voltage V

[OP Amplifier Block]

Input offset voltage V Input bias current for each

input Common-mode input voltage

range Open-loop voltage gain G

[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 V

EXT,VEXT

Step-up circuit reference

-CHG pin

voltage EXTBASE pin saturation

voltage

[OSC Block]

OSCPWR pin output voltage V Maximum oscillation frequency F Input bias current I

[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

[TSD Block]

Operating temperature T Temperature hysteresis width ∆T

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

∆G

GSELL-TH

GSELH-TH

SL REF

B SL REFVSL REF

off SL REFVSL REF

SL DIFF

H SL MODE

L SL MODE

ON MUTE

OFF MUTE

OFF OP

BOP

CM OP

VOP

I EXT

O EXT DRVVEXT

B EXTCHG

B EXT

Vref

E-CHG

Vref

EXT

EXTBASEIO

OSCPWR

OSC max

B OSC

CHG REF

CHG-ON

CHG-OFF

B CHG MONVCHG MON

O CHG DRVVCHG MON

TSD

RL=10Ω –1.0 0 +1.0 dB

RL=10Ω, output voltage difference 5 mV or less

SL REF

OPin(+) = OPin(–)=2V 200 nA

atf=10kHz 31 34 37 dB

RIN=1kΩ 8.0 V

= 1 V (CHG-ON [L]) 170 210 250 µA V

=10V,RIN=1kΩ 6.4 6.9 7.4 V

EXT

= 1.5 V

EXT

EXT-CHG

Both determined at EXTDRV pin EXT-CHG side: CHG-ON [H]

= 1 mA 0.2 V

= 0 V –2.0 µA

OSC

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

030mV

2.0 V

1.0 V

+0.1 VCD–1.0 V

ASP REF

= 2 V 200 nA

= 2.3 V, V

ASP REF

= 2 V –20 +20 mV

= 2 V –25 +25 mV

2.0 V

1.0 V

2.0 V

1.0 V

–5 +5 mV

VCD–1.5 V

20 mA

= 1.5 V (CHG-ON [H])

200 nA

1.23 1.28 1.33 V

VCC–0.15 V

100 kHz

0.32 0.35 0.38 V

2.0 V

1.0 V = 0.3 V 200 nA = 0 V 2.4 3.0 3.6 mA

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Pin Assignment

LB8109M

Pd max — Ta

Allowable power dissipation, Pd max — W

Ambient temperature, Ta —°C

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LB8109M

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

1 is for the

OUT

is for the spindle/sled group. Maximum value + α (α : saturation voltage of upper/lower output Tr) of control output for each 2CH is set by external PWM step-down circuit.

Power supply for the actuator driver controller, maximum value circuit for PWM, sled controller, and MUTE block.

5 CHGDRV

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

10 EXTDRV Base drive output pin for the

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

Constant current

15 DNB-1 Base drive output pin for the

value of each

applied.

PNP-Tr for the step-down PWM that generates the power supply for the H bridge driver that drives the focus/tracking group actuators.

16 DNB-2 Base drive output pin for the

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

PNP-Tr for the step-down PWM that generates the power supply for the H bridge driver that drives the spindle/sled group actuators.

17 ASPDRV Base drive output pin for the

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

OUT

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LB8109M

Continued from preceding page.

Pin No. Symbol Equivalent circuit Function

6 CHG MON

13 EXTBASE Connection pin for the resistor

7 GND GND pin for small-signal block.

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.

(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 CR.

9 OSCPWR CR power supply pin that is

11 V

12 V

18 V

19 UPBASE Connection pin for the resistor

EXT

EXTCHG

ASP

used to prevent invalid current for the oscillation circuit in standby mode.

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

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

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

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

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.).

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

for

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LB8109M

Continued from preceding page.

Pin No. Symbol Equivalent circuit Function

20 VZ

Reference voltage startup circuit

S/S function shant

Zener diode

External power input Forced startup

Input pin for start-up circuit when an external voltage input is applied. The external voltage input is applied through a resistor inserted in series. The voltage is basically determined by the Zener diode + 2V

pin has a current draining capacity up to 20 mA.

; this

24 S/S LB8109M start-up input. (Start

on a low-level input.)

21 OPIN

−

Inverting input pin for internal OP amplifier.

22 OPIN

Noninverting input pin for internal OP amplifier.

23 OPOUT Output pin for internal OP

amplifier. The output circuit type is ‘‘push-pull.’’

14 CHG-ON

Pin for selecting battery charging when external voltage input is applied. This pin determines 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.

25 MUTE Input pin for simultaneously

muting the drivers for the four channels. (High: mute)

26 G-SELECT Pin for switching the spindle

driver transfer gain between 8.3 dB and 14.8 dB (typ. value each). (Low: high gain)

27 SLMODE Pin for switching the sled driver

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

low: step control) 28 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.

39 PGND Output Tr. GND for the four-

channel H bridge drivers. This

pin is not internally connected to

the small-signal system GND.

Continued on next page.

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LB8109M

Block Diagram and Sample Application Circuit

Spindle and

sled

Error amplifier

Buffer

Clamp

Abs. value amp.

Drive control

Bidirectional SW

Drive control

Bidirectional SW

Offset

Maximum value

circuit

Inversion

detection

ASP power supply

Dual-side step drive circuit

1.2 V output

Start-up with external voltage input

S/S reactive output

Start-up

Sawtooth

waveform

oscillation circuit

Dead time

Op amp.

Oscillation blocking Oscillation blocking Oscillation blocking Oscillation blocking

Abs. value amp.

Error

amplifier

Mute

circuit

Maximum value circuit

Thermal

circuit

Buffer

Offset

Error amplifier

Focus & Tracking

Clamp

Dead time

Drive control

Bidirectional SW

Drive control

Bidirectional SW

S/S trigger control

Approx. 0.3 V

Dead time

Judge ext.

power/battery

Forced start-up

control stage

Power supply to

(Shaded blocks)

control

Error amplifier

Battery pulse charging circuit

Current feedback resistance

Bias to internal block

Using high hfe

Supply (approx. 3.5 V)

to DSP, ASP, etc.

charging Set when

Approx. 4.3 V

Note: It should be noted that Type Nos., contants specified herein are for example only, with no guarantee for characteristics implied.

Approx. 3.3 V

Coil with

center tap

Playback setting

Battery

External power

input Jack

No.5233-8/9

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Supplementary Explanation

LB8109M

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 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 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