AN8387S_技术文档

ICs for CD/CD-ROM Player

AN8387S

2-channel Linear Driver

■ Overview

Unit : mm

The AN8387S is an IC which incorporates 2 circuits of

BTL drivers for driving various DC motors such as actua-

tors (focus, tracking traverse), spindles, and loading of

the CD players.

20

19

18

17

16

15

14

13

12

11

1

2

3

4

5

■ Features

6

•

Operating supply voltage range ; V_CC=3.5V to 9V

7

PV_CC=1.5V to 9V

8

9

•

Built-in 2 circuits of voltage driven BTL drivers

(maximun drive current : 500mA)

Quiescent current (current consumption at no input) ;

3.2mA

10

•

Provided with power control pin

5.5±0.3

7.6±0.3

(0.4)

Provided with driver output voltage limiting pin

Built-in thermal protective circuit

(operating temperature : 160°C typ.)

20-Lead SOP Package (SOP020-P-0300A)

■ Applications

Linear driving of the DC motors and actuators of the

CD players. CD radio cassette tape recorders, and so

on.

■ Block Diagram

8

9

4

3

2

7

a

V_CC

GND

V_REF

SW

10kΩ

1kΩ

+

–

+ –

Thermal

Shutdown

Absolute

Value

Absolute

Value

Base

Current

Control

Base Power

Control

11

20

b

BTL

P.V_CC

c

14

13

17

18

P.GND

a) V_CC

: Pin1, Pin10

b) P.V_CC: Pin12, Pin19

c) PGND : Pin5, Pin6, Pin15, Pin16

ICs for CD/CD-ROM Player

AN8387S

■ Absolute Maximum Ratings (Ta=25˚C)

Parameter

Symbol

Rating

Unit

V

Supply Voltage

V_CC

P_D

10

Power Dissipation

1,200 ^Note)

–30 ~ +85

–55 ~ +125

mW

˚C

Operating Ambient Temperature

Storage Temperature

T_opr

T_stg

˚C

Note) When mounted onto the glass epoxy PCB (50mm × 50mm × 0.8mm)

■ Recommended Operating Range (Ta=25˚C)

Parameter

Symbol

Range

V_CC

3.5V ~ 9V

1.5V ~ 9V

Operating Supply Voltage Range

P.V_CC

■ Electrical Characteristics (Ta=25˚C)

Parameter

Symbol

Condition

min.

1

typ.

max.

3.5

1

Unit

mA

µA

V

Current Consumption at No Input (V_CC

)

I_VCCQ

I_PVCCQ

I_PVCCL

V_refH

V_CC=9V, V_ref=4.5V, PV_CC=9V

2

Current Consumption at No Input (PV_CC

PV_CCLeak Current

V_refThreshold (H) ^{Note 1)}

)

0.7

1.2

V_CC=0V, V_ref=OPEN, PV_CC=10V

V_CC=3V, PV_CC=10V, V_IN=0V

1.45

V

_refThreshold (L) ^{Note 2)}

V_refL

1

V

V_CC=5V, V_ref=2.5V,

V_IN=2.4→2.6V

RA_IN

0.75

1

1.25

kΩ

Input Amp. Input Impedance

Driver Input Offset Voltage ^{Note 3)}

Driver Output Offset Voltage ^{Note 3)}

Driver Dead Zone Width ^Note3)

Driver Transfer Gain (+) ^Note3)

Driver (+), (–) Transfer Gain Ratio ^{Note 3)}

V_{I offset}

V_{O offset}

V_CC=9V, V_ref=4.5V, PV_CC=9V

–10

–55

–10

13

0

10

55

19

17

0.5

mV

dB

|V_DZ

G⁺

|

15.1

RG

–1.9

– 0.9

dB

V_CC=9V, V_ref=4.5V, PV_CC=9V,

V_LIM=0V

Driver Output Voltage

V_OLG

–130

2.25

130

3

mV

V

V_CC=9V, V_ref=4.5V, PV_CC=9V,

V_LIM=3V

|V_OL

V_sat

|

Driver Output Voltage Absolute Value

Driver Power Transistor Saturation

Voltage

V

_CC=9V, V_ref=4.5V, PV_CC=9V,

I_O=300mA

_CC=9V, V_ref=2.5V, PV_CC=5V,

V_IN=2.3V

_CC=9V, V_ref=2.5V, PV_CC=5V,

0.29

0.38

V

PC Input Pin Threshold Voltage (H) ^{Note 4)}

V_{PC THH}

2.8

0.9

V

PC Input Pin Threshold Voltage (L) ^{Note 5)}

Protective Diode Forward Voltage

V_{PC THL}

V_PD

0.8

1.8

V

V_IN=2.3V

1.5

I_O=300mA

Thermal Protective Circuit Operating

Temperature

T_THD

160

˚C

Note1) V_refvoltage required to operate the driver.

Note2) If V_refis made lower than this voltage, the driver dose not operate.

Note3) Refer to the driver input/output characteristics chart.

Note4) If the PC pin voltage is made higher than this voltage, there will be no output voltage from the driver. Both (+) and (–)

outputs are pulling in the current.

Note5) If the PC pin voltage is made lower than this voltage, the driver operates normally.

ICs for CD/CD-ROM Player

AN8387S

■ Application Circuit

P V_CC

M

20

19

18

17

16

15

14

13

12

11

10

AN8387S

1

2

3

4

5

6

7

8

9

Error Signal1

V_REF

Error Signal2

V_CC

■ Pin Descriptions

Pin No. Symbol

I/O

DC Voltage

4.8V

Equivalent Circuit

1

Description

1

V_CCpin.

V_CC

10

I

Not connected to the PV_CCpin.

10

Error signal input pin for

the channel-1 driver

2

9

3

8

IN1

IN2

PC1

PC2

2.5V

0V

2

–

+

1kΩ

or

9

Error signal input pin for

the channel-2 driver

4

Operational amplifier is of PNP differential input

Input pin for the PC

(inter-output voltage of the

channel-1 driver OFF)

1kΩ

3

or

8

100kΩ

50kΩ

Input pin for the PC

(inter-output voltage of the

channel-2 driver OFF)

0V

ICs for CD/CD-ROM Player

AN8387S

■ Pin Descriptions (Cont.)

Pin No. Symbol

I/O

DC Voltage

Equivalent Circuit

Description

30kΩ

40kΩ

4

V_ref

I

2.5V

V_refinput pin

5

6

5

6

15

16

PGND

P.GND

O

I

0V

P.GND pin

15

16

7

GND

GND pin

VLIM pin for the channel-2

driver.

Used when limiting the output

voltage of the pins 13 and 14

V_CC

PV_CC

11

20

VLIM2

VLIM1

V_CC

11

or

VLIM pin for the channel-1

driver.

Used when limiting the output

voltage of the pins 17 and 18

20

I

V_CC

12

19

12

19

Power V_CCpin.

Supplies the driver current.

PV_CC

I

3V

× 2

PGND

ICs for CD/CD-ROM Player

AN8387S

■ Pin Descriptions (Cont.)

Pin No. Symbol

I/O

DC Voltage

Equivalent Circuit

Description

Non-inverting output pin

for the channel-2 driver

PV_CC

13

14

17

18

D2+

D2–

D1–

D1+

O

(2.7V)

Inverting output pin for the

channel-2 driver

O

(0.3V)

(2.7V)

Inverting output pin for the

channel-1 driver

13 14

or

Non-inverting output pin

for the channel-1 driver

PGND

18 17

■ Supplementary Explanation

• Operational Description

The AN8387S incorporates the two channels of drivers. Since both channels have the identical functions, the following

describes the channel-1 driver.

• Block Diagram (Channel 1 driver)

PV_CC

Error Amp.

19

20

I_A

Current

Absolute

Value

–

+

VLIM

I_A

Circuit

I_A

Direction

Decision

A

Q1

Q2

+

SW.A

SW.B

SW.C

R1

57.6

R2

57.6

SW. C

SW.B

SW.A

kΩ

V_ref

S.W

–

1kΩ

Thermal

Shutdown

PC

Q3

Q4

I_A=0

SW.B

SW.C

2

4

3

17

18

–

+

R_IN

1

2

(R_L=8.2Ω)

V_ref(= V_CC

)

An error signal (V_IN) input to the pin2 is converted into the absolute value input current I_Athrough the error amplifier and

current absolute value circuit. The value of I_Ais as follows.

ICs for CD/CD-ROM Player

AN8387S

|V_IN–V_ref

R_IN+1kΩ

|

I_A=

–V– | is limited within the following range.

2.25V ≤ |V₊–V_–| ≤ 3V

1) When V_IN>V_ref, the direction determining circuit operates

so that the following conditions are met.

When the pin20 is short-circuited to GND,

|V₊–V_–| ≤ 130mV results regardless of an input error signal

(V_IN).

+

SW.A :

SW.B : ON

If the pin20 is prepared to short-circuit to GND at power-on of

the set, it can be used to prevent operation error at power-on

of the motor or actuator.

SW.C : OFF

2) When V_IN<V_ref, the direction determining circuit operates

so that the following conditions are met.

When the pin20 is not used, short-circuit it to the pins1 and

10.

–

SW.A :

SW.B : OFF

The pin3 is a PC pin. If a voltage of 2.8V or more is

applied to this pin, SW.B and SW.C are turned on, I_Abecomes

0mA, and the base current flows to the bases of Q3 and Q4

simultaneously to turn on Q3 and Q4. As a result, the

pins17 and 18 are almost short-circuited to P.GND.

This IC incorporates the thermal shutdown circuit. If

the chip temperature of the IC comes to about 160˚C,

both drivers of the two channels are turned off. (the output

pins17, 18, 14, and 13 are short-circuited to P.GND)

Similarly, if the applied voltage (V_ref) of the V_refpin4

comes to 1V or less, both drivers of the two channels are

turned off.

SW.C : ON

The output (V₊–V_–) between the pins18 and 17 has the

following relation with the input (V_IN–V_ref) between the

pins 2 and 4.

57.6kΩ

R_IN+1kΩ

(V_IN–V_ref)

(V₊–V_–) =

Therefore, the driver’s gain G will be as follows. (when the

motor load R_Lis 8.2Ω)

(V₊–V_–)

(V_IN–V_ref)

57.6kΩ

1kΩ + R_IN

G =

=

The output voltage V^_of the pin17 and V₊of the pin18 can

be limited by applying a voltage to the VLIM pin20.

For example, if a voltage of 3V is applied to the pin20

when V_CC= 9V and R_L= 8.2Ω, the maximum value of |V₊

• Driver Input/Output Characteristics

• Characteristics Curve

Input Offset (V_IOF

)

Output Offset (V_OOF

Dead Zone (|V_DZ|)

)

Transfer Gain (+) (G₊)

(+), (–) Transfer Gain Ratio (R_G)

P_D–Ta

V_{CC = 9V}

P V_{CC = 9V}

.

V_{ref = 4.5V}

Output

V₁, V₂

B₅

2000

G–

0.25V

When Mounted to PCB : Material. Glass Epoxy PCB.

…

Size 5cm × 5cm × 0.8mm

θj– a=83.3˚C/W

1800

1600

1400

1200

1000

800

B₄

V_IOF

V_OOF

Input

V_IN

4.43V 4.45V

B3

4.5V

4.55V

4.57V

600

|V_DZ

|

400

200

0

B₂

B₁

C_–

– 0.25V

0

20

40

60

80

100

120

140

Ambient Temperature Ta (˚C)

B₅–B₄

20mV

B₂–B₁

20mV

G₊

G_–

G₊=

G_–=

R_G=

,


型号：	AN8387S
厂家：	PANASONIC
描述：	2-channel Linear Driver 双通道线性驱动运动控制电子器件信号电路光电二极管电动机控制驱动
文件：	总6页 (文件大小：72K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

AN8387S [PANASONIC]

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