Datasheet LB1971V Datasheet (SANYO)

Page 1

Ordering number :ENN6214A

91099RM (OT) No. 6214-1/9

Overview

The LB1971V is a bipolar sensorless motor driver that provides a reverse torque braking function and is appropriate for use as the spindle motor driver in CD and MD players. Since the LB1971V can drive motors without the use of Hall elements, this device can contribute to miniaturization, thinner form factors, and lower power dissipation in end products.

Functions and Features

• Three-phase bipolar sensorless drive

• Soft switching drive technique

• Reverse torque braking

• Standby mode power saving function

• FG outputs

• Can be operated from a 3-V supply.

• Thermal protection circuit

Package Dimensions

unit: mm

3175A-SSOP24

112

7.6

8.0

0.5

5.6

0.1

1.6max

1.0

0.65

0.22

0.43

0.15

SANYO: SSOP24

[LB1971V]

SANYO Electric Co.,Ltd. Semiconductor Company

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

Monolithic Digital IC

LB1971V

Three-Phase Full-Wave Sensorless CD

and MD Players Spindle Motor Driver

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.

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage 1 V

1max 7.0 V

Maximum supply voltage 2 V

2max 7.0 V

Maximum output circuit supply voltage V

S max

7.0 V

Maximum output current I

O max

700 mA Allowable power dissipation Pdmax 0.4 W Operating temperature Topr –20 to +75 °C Storage temperature Tstg –55 to +150 °C

Specifications

Absolute Maximum Ratings at Ta = 25°C

Page 2

No. 6214-2/9

LB1971V

Electrical Characteristics at VCC= 3.0 V, VS= 1.5 V, Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Supply voltage 1 V

1 2.0 to 6.0 V

Supply voltage 2 V

2 2.0 to 6.0 V

Output circuit supply voltage V

0 to VCC2V

FG pin applied voltage V

0 to 6.0 V

FG pin output current I

2.0 mA

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions

Ratings

Unit

min typ max

[Current Drain]

Power save mode current drain I

1-1 STBY mode 5µA

Operating current drain I

1-2 IO= 20 mA 3.6 4.6 mA

Pre-drive current I

2IO= 20 mA 0.4 1.0 mA

Current drain + pre-drive current I

1+2 IO= 20 mA 4.0 5.5 mA

[Output Saturation Voltage]

Source 1-1 V

sat

1-1 IO= 0.4 A, VCC1 = VCC2 = V

0.90 1.00 V

Source 1-2 V

sat

1-2 IO= 0.2 A, VCC1 = VCC2 = V

0.85 0.95 V

Source 2-1 V

sat

2-1 IO= 0.4 A, VCC1 = VCC2 =3V, VS= 1.5 V 0.25 0.35 V

Source 2-2 V

sat

2-2 IO= 0.2 A, VCC1 = VCC2 =3V, VS= 1.5 V 0.15 0.25 V

Sink 1 V

sat

3-1 IO= 0.4 A 0.20 0.35 V

Sink 2 V

sat

3-2 IO= 0.2 A 0.13 0.25 V

[STBY Pin]

High-level input voltage V

SSH

1.4 VCC1V

Low-level input voltage V

SSL

–0.1 0.3 V

High-level input current I

SSH

STBY

= 3.0 V 75 µA

Low-level input current I

SSL

STBY

= 0 V –10 µA

[BRAKE Pin]

High-level input voltage V

BRKH

1.4 VCC1V

Low-level input voltage V

BRKL

–0.1 0.3 V

High-level input current I

BRKHVBRK

= 3 V 60 µA

Low-level input current I

BRKLVBRK

= 0 V –10 µA

[Startup Oscillator]

High-level output voltage V

OSCH

1.35 1.50 1.65 V

Low-level output voltage V

OSCL

0.50 0.65 0.80 V

[Position Detection Circuit]

Offset voltage V

OFS

Design target value –10 +10 mV

Common-mode input voltage range

ICM

VCC2 – 1.5

[FG Output Pin]

Output saturation voltage V

FGSAT

IFG = 0.4 mA 0.1 0.25 V

[Thermal Protection Circuit]

Operating temperature TSD Design target value 150 180 °C Hysteresis ∆TSD Design target value 40 °C

[CX Oscillator]

High-level output voltage V

CXH

0.8 1.0 1.2 V

Low-level output voltage V

CXL

0.3 0.5 0.7 V

Oscillator frequency f

C = 470 pF 40 Hz

[SLOPE Circuit]

Charge current I

CHG

1 –6.0 –4.5 –3.0 µA

Discharge current I

CHG

2 3.0 4.5 6.0 µA

Page 3

No. 6214-3/9

LB1971V

Pin Assignment

LB1971V

CSLP1

DET

VCC2

VCC1

BRK

STBY

VOUT

UOUT

CSLP2

202122

151617

819

WOUT

FCOM

UIN

OSC

VIN

WIN

GND

0. 1

120100806040200-20

0. 24

Top view

Pd max — Ta

Allowable power dissipation, Pdmax — W

Ambient temperature, Ta — °C

0. 5

0. 4

2 3 4 5 6 7 8 9 1

11 12

0. 3

0. 2

Page 4

No. 6214-4/9

LB1971V

Application Circuit Example 1: Portable CD Player (maximum speed: about 1000 rpm)

LB1971V

CSLP1

DET

VCC2

VCC1

BRK

STBY

VOUT

UOUT

CSLP2

202122

151617

WOUT

FCOM

UIN

OSC

VIN

WIN

GND

STBY BRK

1 µ

47 µ

0.047 µ

0.47 µ

0.047 µ

470 p

4700 p

1.5 M

20 K

0.25

VCC FG

Application Circuit Example 2: Portable MD Player (maximum speed: about 2000 rpm)

LB1971V

CSLP1

DET

VCC2

VCC1

BRK

STBY

VOUT

UOUT

CSLP2

202122

151617

WOUT

FCOM

UIN

OSC

VIN

WIN

GND

STBY BRK

1 µ

47 µ

0.047 µ

0.022 µ

0.22 µ

0.022 µ

470 p

2200 p

1.5 M

20 K

0.25

VCC FG

Unit (resistance: Ω, capacitance: F )

1819

2 3 4 5 6 7 8 9 10 11 12

1819

2 3 4 5 6 7 8 9 10 11 12

Page 5

Notes on the LB1971V and External Components

1. Three-phase full-wave sensorless drive

The LB1971V is a 3-phase full-wave sensorless motor driver that provides a reverse torque braking function and is appropriate for CD and MD players spindle motor drive. Furthermore, since this driver does not require the use of Hall-effect devices, it can contribute to miniaturization, thinner form factors, and lower power in the motor system.

2. Power supply

This IC uses 3 power supply systems: VS, VCC1, and VCC2. VSis connected to the motor drive transistors, and allows motor speed control to be implemented by connecting a power supply that varies according to the speed control. Since VCC2 is connected to the pre-drive circuit and the position detection comparator circuit, the SOURCE pin output can be made to have a low saturation voltage and a highly efficient motor operation can be achieved by maintaining the condition that VS≤ VCC2 – 1 V. Also note that while this IC can be operated from voltages as low as VCC1 = VCC2 = 2 V, the common-mode input voltage range of the position detector becomes quite narrow at this low voltage, and care is required with respect to the applied VSvoltage. Capacitors with an adequate capacitance for stability must be inserted between each of the power supplies and ground.

3. Soft switching drive

This IC adopts a soft switching drive technique to minimize motor noise. When the output transistors switch between phases, a two-phase excitation state is created, and the output current is switched gradually to suppress motor noise. The two-phase excitation state is determined by the amplitude of the CSLP pin waveform, and that waveform amplitude is determined by the value of the capacitor connected at the CSLP pin and the motor speed. Note that while the soft switching operation increases as the amplitude of the CSLP pin voltage decreases, drive efficiency is reduced and timing problems may occur if this amplitude becomes too small. Therefore, the CSLP pin amplitude should be at least 200 mVp-p at the maximum motor speed.

4. Position detection comparator circuit

The position detection comparator circuit uses the back EMF generated during motor rotation to detect the position of the rotor. The position information acquired by this circuit is used to determine to which sections of the output block power will be applied. Problems that occur during startup due to noise in the VS line can be prevented by inserting capacitors between the FCOM pin and the UIN, VIN, and WIN pins. However, the timing with which power is applied during high-speed motor operation may be delayed and efficiency reduced if these capacitors are too large.

5. Startup oscillator circuit (OSC pin)

This oscillator circuit creates the commutation logic timing required to start a sensorless motor. A capacitor and a resistor are connected in parallel to ground. Use a high resistance of about 1.5 MΩ for this resistor. The value of the capacitor depends on the characteristics of the motor: select a value such that the time required to reach the target speed is minimum and the variation in the startup time is as small as possible. If the capacitance is too large, the variations in startup time will increase, and if it is too small the motor may be prevented from starting up normally.

6. CX oscillator circuit

This oscillator circuit creates the reference clock used for the sensorless motor logic system. Insert a capacitor to ground. The oscillator frequency increases as the capacitance decreases. The oscillator frequency must be less than 60 Hz. (The recommended capacitance is 470 pF.)

7. FG output circuit

The FG output is created from the position detection information acquired from the back EMF waveform. This output has a frequency three times that of the switching frequency. The output circuit is an open collector circuit. The output is pulled up with a resistor.

No. 6214-5/9

LB1971V

Page 6

No. 6214-6/9

LB1971V

Block Diagram

UIN

VIN

WIN

SLOPE

TSD

GND

OSC

VCC1

VCC2

BRK

CSLP2CSLP1

OSC

STBY

DET

UVW

BGP

BRK

STBY

PWM

FCOM

Sensorless logic

Envelope detector

Output drive circuit

Soft switching drive

Page 7

No. 6214-7/9

LB1971V

Pin Functions

Pin No. Symbol Pin voltage Function Equivalent circuit

2 1

OUT

VCC1

1 23

Continued on next page.

• U, V, and W phases coil outputs

• Rf connection The LB1971V implements current control using a resistor (Rf) connected between this pin and ground to detect the drive current.

0 to VCC1

STBY

VCC1

30 kΩ

70 kΩ

• Standby control Normal operation: High Standby: Low or open

0 to V

BRK

VCC1

330 Ω

50 kΩ

• Forward/reverse torque switching Forward torque: Low or open Reverse torque: High

2.0 V to 6.0 V

• Power supply connection

• FG output These are open collector output.

VCC1

• Motor drive and speed control blocks power supply The voltage applied to this pin must be strictly lower than V

0 V to VCC2

2.0 V to 6.0 V

• Power supply connection for the predrive circuit and the motor back EMF detection comparator circuit

Page 8

No. 6214-8/9

LB1971V

Pin No. Symbol Pin voltage Function Equivalent circuit

Continued on next page.

DET

• Drive waveform sink side envelope

detection Nothing connected to this pin in normal operation.

11 12

CSLP1 CSLP2

VCC1

1 kΩ

• Connection for the capacitor used for

triangular wave generation The soft switching operation of the coil output waveform is created using this triangular waveform.

15 16 22

• Unused

• Clock oscillator used by the sensorless logic Connect a capacitor between the CX pin and ground. Oscillator frequency must be set up to 60 kHz.

Continued from preceding page.

• Frequency characteristics determination Closed loop oscillation of the current control system can be stopped by connecting a capacitor between this pin and ground.

1 kΩ

CC1

GND

•Ground

VCC1

1 kΩ

102312

30 kΩ

1 kΩ

1 kΩ1 kΩ

VCC1

2 kΩ

Page 9

PS No.6214-9/9

LB1971V

This catalog provides information as of September, 1999. Specifications and information herein are subject to change without notice.

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.

Pin No. Symbol Pin voltage Function Equivalent circuit

OSC

18 20 19

• Inputs to the motor back EMF detection

comparator These pins are connected to the output pins via a resistor internally in the IC. Connect capacitors between these IN pins and their corresponding -FCOM.

FCOM

• Motor coil midpoint input The back EMF output is detected by refering to these voltages.

Continued from preceding page.

• Connection for the triangular waveform oscillator capacitor. This waveform is used to generate the forcible motor startup waveform during motor startup. Connect a capacitor and a resistor between this pin and ground. Capacitance required depends on the characteristics of motor. Use a capacitor so that the time interval until when the motor rotation reaches the desired speed becomes the shortest.

1 kΩ

CC1

VCC1

19 18

200 Ω

10 kΩ

2 23