Datasheet LB1998 Datasheet (SANYO)

Ordering number : EN5979A

LB1998

Monolithic Digital IC

LB1998

Three-Phase Brushless Motor Driver

for CD-ROM Spindle Drive

Overview

The LB1998 is a three-phase brushless motor driver especially suited for CD-ROM spindle motor drives.

Functions

• Current linear drive

• Control V type amplifier

• Top side current detection technique reduces loss voltage of current detection resistor. Voltage effect of this resistor reduces internal current drain of IC.

• Built-in current limiter circuit

• Built-in reverse blocking circuit

• Hall FG output

• Built-in 1 Hall FG/3 Hall FG switching circuit

• Built-in short braking circuit

• Built-in Hall bias cicuit

• Built-in thermal shutdown circuit

• Built-in S/S function

• Built-in 3 mode gain switching function ensures compatibility with 8/12 cm CAV and CLV discs

Package Dimensions

unit: mm

3234-HSOP28HC

[LB1998]

15.3

6.2

28 15

7.9

1

0.85

2.25

2.5max

0.1

2.0

With substrate (

1.8

1.6

2.7

0.8

Pd max – Ta

114.3 mm×76.1 mm×1.6 mm3)

0.65

4.9

0.3

0.25

SANYO : HSOP28HC

10.5

1.3

1.2

IC only

0.8

0.4

Allowable power dissipation, Pd max – W

0

Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all SANYO products described or contained herein.

0–25 25 50 75 100

Ambient temperature, Ta – °C

0.79

1.08

0.474

SANYO Electric Co.,Ltd. Semiconductor Company

TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN

60499RM(KI)/30299RM(KI)

No. 5979-1/9

LB1998

Specifications

Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Power supply voltage 7.0 V

Applied output voltage 14.4 V Applied intput voltage V Output current 1.3 A Allowable power dissipation Pd max IC only 0.79 W

Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +150 °C

Operating Conditions at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Power supply voltage 4 to 6 V

VCC1 max VCC2 max VCC3 max

VO max

VIN max

IO max

VCC1 VCC2

with substrate (114.3 × 76.1 × 1.6 mm3, glass exposy)

≥VCC1

14.4 V

VCC1

1.80 W

4 to 13.6 V

Sample Application at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

12V type Regulated voltage 4 to 6 V

VCC1 VCC2

Unregulated voltage 4 to 13.6 V

No. 5979-2/9

LB1998

Electrical Characteristics at Ta = 25°C, VCC1 = 5V, VCC2 = 12V

Parameter

[Power supply current] Power supply current 8 mA

Output idle current 200 µA

[Output] Saturation voltage, upper side 1 V Saturation voltage, lower side 1 0.3 V Current limiter setting voltage 0.25 V [Hall amplifier] Common mode input voltage range 1.2 V Input bias current 1 µA Minimum Hall input level 60 [S/S pin] High level voltage 2.0 V Low level voltage 0.7 V Input current 200 µA Leak current –30 µA [Control]

V

pin input current

CIN

V

pin input current

CREF

Voltage gain 0.25 times Startup voltage 1.55 1.85 V Startup voltage width 100 200 mV [Gain switching amplifier] Input offset voltage Design target value –8 +8 mV OPEN LOOP voltage gain f = 10 kHz, Design target value 43 dB Same-phase input voltage range 0 3.5 V [Hall power supply] Hall power supply voltage 0.8 V Allowable current 20 mA [Thermal shutdown] Operating temperature Design target value 150 180 210 °C Hysterisis Design target value 15 °C [Short braking] Brake pin at High level 4 5 V Brake pin at Low level 0 1 V [1 Hall FG/3 Hall FG switching]

FG

pin at High level

SEL

FG

pin at Low level

SEL

[Gain switching analog switch] Analog switch at High level Analog switch at Low level 0 0.2

Symbol

ICC1

ICC2 ICC1OQ ICC2OQ

VOU1 VOD1

V

CL

V

HCOM

I

HIB

V

HIN

V

S/SH

V

S/SL

I

S/SI

I

S/SL

I

VC

I

VCREF

GV

CO

V

CTH

∆V

CTH

V

GCOFFSET

G

VGC

V

GCOM

V

H

I

H

T

TSD

∆T

TSD

V

BRH

V

BRL

V

FSH

V

FSL

R

INH

R

INL

V

= V

CIN

V

= V

CIN

V

= 0V

S/S

V

= 0V

S/S

IO = –0.5A, VCC1 = 5V, VCC2 = 12V IO = 0.5A, VCC1 = 5V, VCC2 = 12V RRF = 0.25Ω

V

= 5V

S/S

V

= 0V

S/S

V

= V

CIN

CREF

V

= V

CIN

CREF

∆VRF/∆VC, Note 1 V

= 1.65V, Note 1

CREF

V

= 1.65V, Note 1

CREF

IH = 5 mA

Conditions

CREF CREF

= 1.65V = 1.65V

Note:

• During S/S OFF (standby), the Hall comparator is at High.

• Gain switching amplifier operated at a factor of 1.

• Design target values are not measured.

Ratings

min typ max

250 300 mA

1.0

VCC1–1.0

Unit

60 µA

mV

VCC1

1 µA 1 µA

4 5 0 1

VCC1VCC–0.5

P-P

No. 5979-3/9

Truth Table

Source –> Sink

1

2

3

4

5

6

Input: H: Input 1 is higher in potential than input 2 by at least 0.2V. L: Input 1 is lower in potential than input 2 by at least 0.2V.

Phase W –> Phase V Phase V –> Phase W Phase W –> Phase U Phase U –> Phase W Phase V –> Phase W Phase W –> Phase V

Phase U –> Phase V Phase V –> Phase U Phase V –> Phase U

Phase U –> Phase V Phase U –> Phase W Phase W –> Phase U

Hall input Control

UV

H

L

H

L

H

L L

L

H

L

H

Brake Mode Switching Truth Table

BRAKE pin

L, OPEN Foward Reverse brake

H Foward Short brake

V

CIN

> V

CREF

V

CIN

< V

CREF

LB1998

W

L

H

LL

H

V

CIN

H L H L H L H L H L H L

Pin Assignment

V

CIN

R

IN

R

IN

R

IN

SIG GND

S/S

BRAKE

PWR GND

FG

RS

V

W

IN

1

2

1

3

2

4

3

5

6

7

LB1998

8

9

10

H

11

1

28

R

OUT

27

R

OUT

26

R

OUT

25

FG

24

FC

23

V

CREF

22

W

PWR GND

21

V

OUT

20

U

OUT

19

V

CC

18

RF

3

2

1

SEL

OUT

2

12

W

2

IN

13

V

1

IN

14

V

2

IN

17

16

15

V

1

CC

U

2

IN

U

1

IN

Top view

A11194

No. 5979-4/9

Block Diagram

+

–

U

IN

1

V

CC

1

V

CC

2

RF

U

OUT

U

IN

2

+

–

V

IN

1

–

+

V

IN

2

+

–

W

IN

1

W

IN

2

V

H

FG

–

+

V

OUT

W

OUT

PWR GND

BRAKE

V

CREF

+

–

+

–

V

CIN

R

OUT

1

R

IN

1

–

+

–

+

RS

FC

S/S

FRAME GND

FG

SEL

Matrix

Waveform distributor

Hall power

supply

Forward/

reverse

Current limiter

Short brake/

reverse brake switching

Thermal shutdown

Reference voltage

Gain switching amplifier

1 Hall FG/

3 Hall FG

Rotation direction detector

A11193

R

OUT

2

R

IN

2

R

OUT

3

R

IN

3

LB1998

No. 5979-5/9

Sample Application Circuit

LB1998

Control voltage

Gain switching SW(0V or V

-VC

1 to each pin

CC

IN

S/S

Applying V activates load between R

OUT

Brake mode switching

FG output

Reverse detection

0.033µF

0.033µF 0.033µF

CC

1)

10

11

12

13

14

1

VC

2

R

IN

3

R

IN

4

R

IN

5

SIG GND

6

S/S

7

BRAKE

PWR GND

8

FG

9

RS

V

H

W

V

IN

V

IN

1

2

3

1

IN

2

IN

1

2

LB1998

PWR GND

R

FG

V

W

V

U

V

OUT

SEL

FC

CREF

OUT

CC

RF

CC

U

IN

U

IN

28

3

27

2

26

1

1/3 Hall FG switching

25

0V or Open:1 Hall FG

1 :3 Hall FG

V

CC

24

0.1µF

Control reference voltage

23

22

0.1µF

21

0.1µF

20

0.1µF

19

2

Motor power supply voltage

12V

0.1µF

18

0.1µF

Power supply voltage

5V

Hall element

17

1

16

2

15

1

A11195

No. 5979-6/9

LB1998

Pin Descriptions

Pin number Pin name Pin voltage Equivalent circuit Pin function

Source side predrive voltage and

19 4V to 13.6V

17 4V to 6V

VCC2

V

CC

1

9R S

8F G

15 16

13 14

11 12

10

U

IN

UIN2

VIN1

VIN2

WIN1 WIN2

V

H

1

1.2V to

VCC1–1V

100µA

11

200Ω

13 15

25µA

75µA

30 kΩ

10 kΩ

25µA

2 kΩ

VCC1

8 9

A11196

25µA

200Ω

A11197

VCC1

10

constant current control amplifier voltage supply pin

Power supply pin for all circuits except output transistors, source predriver, and low current control amplifier

Reverse detector pin Forward rotation: High Reverse rotation: Low

1 Hall or 3 Hall element waveform Schmitt comparator combined output

U phase Hall element input and reverse detector U phase Schmitt

VCC1

comparator input pin Logic High indicates UIN1 > UIN2.

12

V phase Hall element input and

14

reverse detector V phase Schmitt

16

comparator input pin Logic High indicates VIN1 > VIN2.

W phase Hall element input and reverse detector W phase Schmitt comparator input pin Logic High indicates WIN1 > WIN2. Hall element lower side bias voltage supply pin

6S/S

0V to W

5 SIG GND

24 F C

CC

A11198

VCC1

1

6

75 kΩ

50 kΩ

A11199

When this pin is at 0.7V or lower, or when it is open, all circuits are inactive. When driving motor, set this pin to 2V or higher.

GND pin for all circuits except output

VCC1

Control loop frequency compensator pin. Connecting a capacitor

2 kΩ

between this pin and GND prevents closed loop oscillation in current

24

20 kΩ 5 kΩ

A11200

limiting circuitry.

Continued on next page

No. 5979-7/9

LB1998

Continued from preceding page

Pin number Pin name Pin voltage Equivalent circuit Pin function

Control reference voltage supply pin. Determines control start voltage.

Speed control voltage supply pin V type control technique VC > V VC < V

: Forward

CREF

: Slowdown

CREF

(Reverse-blocking circuit prevents reverse rotation.)

23 0V to 3.5V

1 0V to 3.5V

V

CREF

CIN

25µA15µA25µA15µA

68 kΩ

1

6µA6µA6µA

6 pF

200Ω

VCC1

23

A11201

VCC1

23

A11202

22

W

OUT

PWR GND 21 20

V

OUT

U

OUT

18 R F

25

FG

SEL

7 BRAKE

3.9Ω

100µA

75 kΩ

50 kΩ

75 kΩ

V

CC

18

20 21 22

PWRGND

A11203

VCC1

25

A11204

VCC1

3

A11205

W phase output Output transistor GND

2

V phase output U phase output

Upper side output PNP transistor collector pin (common for all 3 phases). For current detection, connect resistor between VCC3 pin and RF pin. Constant current control and current limiter works by detecting this voltage.

1 Hall FG/3 Hall FG output, switching pin: High –> 3 Hall FG

Low/Open –> 1 Hall FG

Brake mode switching pin BRAKE: High –> Short brake Low/Open –> Reverse brake Brake mode changes when V

CIN

> V

CREF

.

Continued on next page

No. 5979-8/9

LB1998

Continued from preceding page

Pin number Pin name Pin voltage Equivalent circuit Pin function

Gain switching selector pin When set to High (VCC1), resistor connected between R is selected as negative feedback resistor.

Gain switching selector pin When set to High (VCC1), resistor

2

connected between R

3

is selected as negative feedback

4

resistor. Gain switching selector pin

When set to High (VCC1), resistor connected between R is selected as negative feedback resistor.

Negative feedback resistor connector pins Connect negative feedback resistors between these pins and V

26

27

28

2

3

4

RIN1

RIN2

R

OUT

VCC1

V

1

0 to

CC

Low: 0V

VCC1

High:

3

IN

1

2

3

26 27 28

10 kΩ

A11206

OUT

1 and V

2 and V

3 and V

.

CIN

Specifications of any and all SANYO products described or contained herein stipulate the performance, characteristics, and functions of the described products in the independent state, and are not guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer's products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all semiconductor products fail with some probability. It is possible that these probabilistic failures could give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire, or that could cause damage to other property. When designing equipment, adopt safety measures so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits and error prevention circuits for safe design, redundant design, and structural design.

In the event that any or all SANYO products(including technical data,services) described or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be exported without obtaining the export license from the authorities concerned in accordance with the above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co. , Ltd.

Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use.

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 June, 1999. Specifications and information herein are subject to change without notice.

No. 5979-9/9

PS