SANYO LB1971V

Ordering number :ENN6214A
Monolithic Digital IC
LB1971V
Three-Phase Full-Wave Sensorless CD
and MD Players Spindle Motor Driver
Overview
Package Dimensions
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.
unit: mm
3175A-SSOP24
1.0
[LB1971V]
13
Functions and Features
0.5
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
12
0.15
1.6max
1
8.0
0.1
•
•
•
•
•
•
•
7.6
5.6
24
0.22
0.65
0.43
SANYO: SSOP24
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage 1
VCC1max
7.0
Maximum supply voltage 2
VCC2max
7.0
V
VS max
7.0
V
Maximum output current
IO max
700
mA
Allowable power dissipation
Pdmax
0.4
W
Maximum output circuit supply voltage
V
Operating temperature
Topr
–20 to +75
°C
Storage temperature
Tstg
–55 to +150
°C
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.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
91099RM (OT) No. 6214-1/9
LB1971V
Allowable Operating Ranges at Ta = 25°C
Parameter
Symbol
Conditions
Ratings
Unit
Supply voltage 1
VCC1
2.0 to 6.0
Supply voltage 2
VCC2
2.0 to 6.0
V
V
Output circuit supply voltage
VS
0 to VCC2
V
FG pin applied voltage
VFG
0 to 6.0
FG pin output current
IFG
2.0
V
mA
Electrical Characteristics at VCC = 3.0 V, VS = 1.5 V, Ta = 25°C
Parameter
Symbol
Conditions
Ratings
min
typ
Unit
max
[Current Drain]
Power save mode current drain
ICC1-1
STBY mode
5
µA
Operating current drain
ICC1-2
IO = 20 mA
3.6
4.6
mA
Pre-drive current
Current drain + pre-drive current
ICC2
IO = 20 mA
0.4
1.0
mA
ICC1+2
IO = 20 mA
4.0
5.5
mA
[Output Saturation Voltage]
Source 1-1
Vsat1-1
IO = 0.4 A, VCC1 = VCC2 = VS
0.90
1.00
V
Source 1-2
Vsat1-2
IO = 0.2 A, VCC1 = VCC2 = VS
0.85
0.95
V
Source 2-1
Vsat2-1
IO = 0.4 A, VCC1 = VCC2 =3V, VS = 1.5 V
0.25
0.35
V
Source 2-2
Vsat2-2
IO = 0.2 A, VCC1 = VCC2 =3V, VS = 1.5 V
0.15
0.25
V
Sink 1
Vsat3-1
IO = 0.4 A
0.20
0.35
V
Sink 2
Vsat3-2
IO = 0.2 A
0.13
0.25
V
V
[STBY Pin]
High-level input voltage
VSSH
1.4
VCC1
Low-level input voltage
VSSL
–0.1
0.3
High-level input current
ISSH
VSTBY = 3.0 V
Low-level input current
ISSL
VSTBY = 0 V
75
V
µA
–10
µA
[BRAKE Pin]
High-level input voltage
VBRKH
1.4
VCC1
Low-level input voltage
VBRKL
–0.1
0.3
High-level input current
IBRKH
VBRK = 3 V
Low-level input current
IBRKL
VBRK = 0 V
60
V
V
µA
–10
µA
[Startup Oscillator]
High-level output voltage
VOSCH
1.35
1.50
1.65
V
Low-level output voltage
VOSCL
0.50
0.65
0.80
V
–10
+10
mV
0
VCC2 – 1.5
V
0.25
V
[Position Detection Circuit]
Offset voltage
VOFS
Common-mode input voltage range
VICM
Design target value
[FG Output Pin]
Output saturation voltage
VFGSAT
IFG = 0.4 mA
0.1
[Thermal Protection Circuit]
Operating temperature
Hysteresis
TSD
Design target value
∆TSD
Design target value
150
180
°C
40
°C
[CX Oscillator]
High-level output voltage
VCXH
0.8
1.0
1.2
Low-level output voltage
VCXL
0.3
0.5
0.7
Oscillator frequency
fCX
C = 470 pF
40
V
V
Hz
[SLOPE Circuit]
Charge current
ICHG1
–6.0
–4.5
–3.0
µA
Discharge current
ICHG2
3.0
4.5
6.0
µA
No. 6214-2/9
LB1971V
CSLP2
2
3
4
5
6
7
8
9
10
11
12
CX
CSLP1
1
NC
DET
GND
13
NC
14
FC
15
OSC
16
FG
WIN
UIN
17
VCC2
FCOM
VIN
NC
18
VS
WOUT
19
VCC1
20
BRK
21
STBY
22
UOUT
23
VOUT
24
RF
Pin Assignment
LB1971V
Top view
Allowable power dissipation, Pdmax — W
Pd max — Ta
0. 5
0. 4
0. 3
0. 24
0. 2
0. 1
0
-20
0
20
40
60
80
100
120
Ambient temperature, Ta — °C
No. 6214-3/9
LB1971V
13
DET
CSLP1
CSLP2
1
2
3
4
5
6
7
8
9
10
11
12
NC
NC
CX
14
FC
15
OSC
16
FG
WIN
UIN
17
VCC2
FCOM
VIN
NC
18
VS
WOUT
19
VCC1
20
BRK
21
STBY
22
470 p
UOUT
23
1.5 M
VOUT
24
RF
0.25
GND
0.47 µ
4700 p
4700 p
4700 p
Application Circuit Example 1: Portable CD Player (maximum speed: about 1000 rpm)
LB1971V
20 K
+
0.047 µ
+
0.047 µ
0.047 µ
1µ
47 µ
STBY
BRK
VCC
VS
FG
Unit (resistance: Ω, capacitance: F )
13
DET
CSLP1
CSLP2
1
2
3
4
5
6
7
8
9
10
11
12
NC
NC
CX
14
FC
15
OSC
16
FG
WIN
UIN
17
VCC2
FCOM
VIN
NC
18
VS
WOUT
19
VCC1
20
BRK
21
STBY
22
470 p
UOUT
23
1.5 M
VOUT
24
RF
0.25
GND
0.22 µ
2200 p
2200 p
2200 p
Application Circuit Example 2: Portable MD Player (maximum speed: about 2000 rpm)
LB1971V
20 K
+
+
0.047 µ
0.022 µ
0.022 µ
1µ
47 µ
STBY
BRK
VS
VCC
FG
Unit (resistance: Ω, capacitance: F )
No. 6214-4/9
LB1971V
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. VS is 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 VS voltage.
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
BRK
FCOM
WIN
VIN
UIN
OSC
CSLP1 CSLP2 FC
Soft switching drive
CX
OSC
SLOPE
TSD
Output drive circuit
CX
BRK
WV U
FG
STBY
STBY
DET
BGP
GND
Envelope detector
VCC1
Rf
W
V
U
VS +
VCC2
+
+
FCOM
PWM
LB1971V
Block Diagram
Sensorless logic
No. 6214-6/9
LB1971V
Pin Functions
Pin No.
2
1
23
Symbol
Pin voltage
UOUT
VOUT
WOUT
Function
Equivalent circuit
VS
• U, V, and W phases coil outputs
2
1 23
VCC1
24
• Rf connection
The LB1971V implements current control
using a resistor (Rf) connected between
this pin and ground to detect the drive
current.
RF
24
VCC1
3
STBY
0 to VCC1
• Standby control
Normal operation: High
Standby: Low or open
30 kΩ
3
70 kΩ
VCC1
4
BRK
0 to VCC1
5
VCC1
2.0 V to 6.0 V
6
VS
0 V to VCC2
7
VCC2
2.0 V to 6.0 V
• Forward/reverse torque switching
Forward torque: Low or open
Reverse torque: High
330 Ω
4
50 kΩ
• Power supply connection
• Motor drive and speed control blocks
power supply
The voltage applied to this pin must be
strictly lower than VCC2.
• Power supply connection for the predrive circuit and the motor back EMF
detection comparator circuit
VCC1
8
8
FG
• FG output
These are open collector output.
Continued on next page.
No. 6214-7/9
LB1971V
Continued from preceding page.
Pin No.
Symbol
Pin voltage
Function
Equivalent circuit
VCC1
9
FC
• Frequency characteristics determination
Closed loop oscillation of the current
control system can be stopped by
connecting a capacitor between this pin
and ground.
9
2 kΩ
VCC1
10
DET
• Drive waveform sink side envelope
detection
Nothing connected to this pin in normal
operation.
30 kΩ
1 kΩ
2
1 kΩ
1 kΩ
1 kΩ
1
23
10
VCC1
11
12
CSLP1
CSLP2
• Connection for the capacitor used for
triangular wave generation
The soft switching operation of the coil
output waveform is created using this
triangular waveform.
1 kΩ
11 12
13
GND
•Ground
VCC1
14
CX
• 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.
1 kΩ
14
15
16
22
NC
• Unused
Continued on next page.
No. 6214-8/9
LB1971V
Continued from preceding page.
Pin No.
17
Symbol
OSC
Pin voltage
Function
Equivalent circuit
VCC1
• 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
17
18
20
19
WIN
UIN
VIN
• 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.
VCC1
2 1 23
20
19
18
21
FCOM
10 kΩ
200 Ω
200 Ω
21
• Motor coil midpoint input
The back EMF output is detected by
refering to these voltages.
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 September, 1999. Specifications and information herein are
subject to change without notice.
PS No.6214-9/9