BA6897FP-E2应用文章市场行情现货热卖使用介绍供应商报价-中国IC网-芯三七

Optical disc ICs

4-channel BTL driver for CD players

BA6897S / BA6897FP

The BA6897S and BA6897FP are a 4-channel BTL driver for CD player motors and actuators. It has an internal 5V

regulator and standard operational amplifier, and is suited to a wide range of applications.

FApplications

CD players, CD-ROM drives

FFeatures

1) Minimal number of external components.

4) Internal standard operational amplifier.

5) Internal thermal shutdown circuit.

2) Driver gain is adjustable with just one attached resis-

tor.

3) Internal 5V regulator (attached PNP transistor nec-

essary).

FAbsolute maximum ratings (Ta = 25_C)

FRecommended operating conditions (Ta = 25_C)

391

Optical disc ICs

BA6897S/BA6897FP

FBlock diagram

392

Optical disc ICs

BA6897S/BA6897FP

FPin descriptions

BA6897S

393

Optical disc ICs

BA6897S/BA6897FP

BA6897FP

394

Optical disc ICs

BA6897S/BA6897FP

FInput/output circuits

395

Optical disc ICs

BA6897S/BA6897FP

FElectrical characteristics (unless otherwise noted, Ta = 25_C, VCC = 8V, f = 1kHz, RL = 8Ω)

396

Optical disc ICs

BA6897S/BA6897FP

FMeasruement circuit (BA6897S)

397

Optical disc ICs

BA6897S/BA6897FP

FCircuit operation

(1) Driver

The input signals, which normally center on 2.5V, are V/I

convertedbythepreamplifier, generatingacurrentcorre-

sponding to the input voltage. This current is passed

through a resistor and into the internal reference voltage

component, the preamplifier output being a signal cen-

tering on the internal reference voltage. Two systems

(positive phase and negative phase) are created during

V/I conversion, generating BTL output via the driver buff-

er.

Inputs to the IC are the focus tracking error signal from

the servo preamplifier and the control signal from the mo-

tor.

(2) Regulator

This is a typical series regulator that generates a refer-

ence voltage internally. A PNP low saturation transistor

must be connected.

(3) Amplifier

General 4558 type.

398

Optical disc ICs

BA6897S/BA6897FP

FApplication examples

399

Optical disc ICs

BA6897S/BA6897FP

400

Optical disc ICs

BA6897S/BA6897FP

FOperation notes

(1) The BA6897S and BA6897FP have an internal

thermal shutdown circuit. Output current is muted when

the chip temperature exceeds 175_C (typically).

(2) If the mute pin voltage is opened or lowered below

0.5V, the output current will be muted. The mute pin

should be pulled up above 2.0V during normal use.

(3) The bias pin is muted when lowered below 1.4V

(typically). Make sure it stays above 1.6V during normal

use.

age. In each case, only the drivers are muted. During

muting, the output pins remain at the internal bias volt-

age, roughly (V^CC–VF)/2.

(5) Be sure to connect the IC to a 0.1µF bypass capaci-

tor to the power supply, at the base of the IC.

(6) Theradiatingfinisconnectedtothepackagesinter-

nal GND, but should also be connected to an external

ground.

(7) The capacitor between regulator output (pin 6) and

GNDalsoservestopreventoscillationoftheIC, soselect

one with good temperature characteristics.

(4) Muting occurs during thermal shutdown, mute-on

operations or a drop in the bias pin voltage or supply volt-

FElectrical characteristic curves

401

Optical disc ICs

BA6897S/BA6897FP

FExternal dimensions (Units: mm)

402

型号:	BA6897FP-E2
生命周期：	Obsolete
零件包装代码：	SOIC
包装说明：	HSSOP,
针数：	28
Reach Compliance Code：	unknown
HTS代码：	8542.39.00.01
Factory Lead Time：	6 weeks
风险等级：	5.83
商用集成电路类型：	CONSUMER CIRCUIT
JESD-30 代码：	R-PDSO-G28
长度：	18.5 mm
端子数量：	28
最高工作温度：	85 °C
最低工作温度：	-35 °C
封装主体材料：	PLASTIC/EPOXY
封装代码：	HSSOP
封装形状：	RECTANGULAR
封装形式：	SMALL OUTLINE, HEAT SINK/SLUG, SHRINK PITCH
认证状态：	Not Qualified
座面最大高度：	2.41 mm
最大压摆率：	14 mA
最大供电电压 (Vsup)：	9 V
最小供电电压 (Vsup)：	4.5 V
表面贴装：	YES
温度等级：	OTHER
端子形式：	GULL WING
端子节距：	0.8 mm
端子位置：	DUAL
宽度：	7.5 mm
Base Number Matches：	1

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