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Ordering number : EN6186
LB1978V
Monolithic Digital IC
LB1978V
Three-Phase Half-Wave Sensorless Motor Driver
for Headphone Stereos
Functions and Features
• Three-phase sensorless motor driver
• Built-in speed control
• Built-in reference voltage and forward/reverse
switching pin
• Soft switching
Package Dimensions
unit: mm
3191-SSOP30
[LB1978V]
30
16
1.0
• Built-in short brake drive pin
5.6
115
9.95
0.22
0.65
0.43
0.15
0.1
1.6max
SANYO : SSOP30
7.6
0.5
Specifications
Absolute Maximum Ratings at Ta = 25˚C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage Vcc max 2.0 V
Output transistor withstand voltage Vsus 4V
Maximum output current Io max 0.6 A
Allowable power dissipation Pd max Tj = 125˚C 0.4 W
Operating temperature Topr 0 to 60 ˚C
Storage temperature Tstg –40 to +125 ˚C
Allowable Operating Ranges at Ta = 25˚C
Parameter Symbol Conditions Ratings Unit
Power supply voltage Vcc 1.0 to 1.7 V
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
63099RM(KI)
No. 6186-1/9
Page 2
LB1978V
Electrical Characteristics at Ta = 25˚C, Vcc = 1.2V, in the specified test circuit
Parameter Symbol Conditions
Power supply current Icc START pin H, RIRF = 180 kΩ 6.8 10 mA
START pin L, VBR = 0V 0 10 µA
Reference voltage Vref 0.725 0.755 0.785 V
Reference voltage characteristics ∆Vref
Reference voltage load characteristics
Oscillator cycle T
Rotation switching load characteristics
/ ∆Vcc Vcc = 1.0 to 1.7V 1.0 2.0 %/V
∆Iref
∆Vref
∆Iref
T
Iref = 0 to –50 µA –0.2 –0.06 mV/µA
CS = 1500 pF 0.52 0.6 0.68 ms
S
CS = 1500 pF, 7.70 10.9 ms
F/S
R
= 180 kΩ *Target
IRF
Rotation detection accuracy NF/S TS = 0.60 ms *Target –16 +16 %
COM voltage V
COM
–R
COM
= 1 kΩ 12 25 38 mV
F side output saturation voltage Vsat1 Vcc = 1.0V, Im = 0.3A 0.17 0.30 V
S side output saturation voltage Vsat2 Vcc = 1.0V, Im = 0.2A 0.12 0.25 V
S/S pin input High level voltage V
S/S pin input Low level voltage V
F/S DR pin ON voltage V
F/S DR pin OFF voltage V
SSH
SSL
Lon
Loff
Vcc–0.3 V
TC pin pull-in voltage VTC1 F/S = H 80 110 150 mV
VTC2 F/S = L 160 220 300 mV
BR1 ON voltage V
BR1 OFF voltage V
BRsat voltage V
CI rise voltage V
CI hysteresis width ∆V
IRF voltage V
VI output current I
PV pin voltage V
∆IFC/∆VVI ratio ∆IFC/∆V
Output transistor OFF voltage V
Output transistor ON voltage V
BRon
BRoff
BRsat
OUT
OUT
Io = 6 mA, V
CI
CI
R
IRF
VI
PV
VI
= 180 kΩ 0.725 0.755 0.785 V
IRF
VVI = 0.3V, VIV = GND 26 30 34 µA
= 1.2V 0.15 0.3 V
BR1
OFF Vcc–0.3 V
ON 0.3 V
Note: Items shown to be “Target” are not measured.
Ratings
min typ max
Unit
0.9 V
0.3 V
0.2 V
0.9 V
0.3 V
0.620 0.650 0.680 V
60 80 100 mV
0.720 0.755 0.785 V
150 210 250 µA/V
No. 6186-2/9
Page 3
0.4
0.26
Allowable power dissipation, Pd max (W)
025 60
LB1978V
Pd max – Ta
Pin Assignment
Ambient temperature, Ta – (°C)
Vcc
VREF
S/S
DR
F/S
W1
V1
U1
PGNDW2V2
30 2829 27 2526 24 2223 21 1920 18 1617
U2
DU
LB1978V
1 3 2 4 6 5 7 9 8 10 1211 13 1514
IV
FC
OSC
COM
IRF
CI
PW
PV
VI
BR1
BR2
TC1
TC2
SGND
P1
P3
P2
Top view
No. 6186-3/9
Page 4
Equivalent Circuit Block Diagram
LB1978V
VccOSC
DR
TC1
TC2
P1
BR1P3P2
Brake
circuit
BR2
IRF
COM
S/S
Vref
Constant
current circuit
Current bias
Reference
voltage
SGND
Oscillator
detection
Startup
Divider
Rotation
detector
Soft switch
Logic circuitry
Startup
FG pulse
switching
Soft switching
Speed
select
divider
F/S CI PW PV IV VI
d/dt Pulse
Current
buffer
Drive select + predriver
Comparator
VI
U1
V1
W1
U2
V2
W2
PGND
DU
FC
Sample Application Circuit
1µF
30 2829 27 2526 24 2223 21 1920 18 1617
Vcc VREF S/S DR F/S W1 V1 U1 PGND W2 V2 U2 DU SGND P3
1 3 2 4 6 5 7 9 8 10 1211 13 1514
2.2µF
1500pF
0.01
µF
0.01
µF
0.01
µF
LB1978V
OSC COM IRFFC CI PW PV IV VI BR1 BR2 TC1 TC2 P1 P2
180
6.2kΩ
680kΩ
kΩ
0.33µF
0.1µF
1kΩ
0.01µF
180
kΩ
0.1µF
100Ω
68kΩ
20kΩ
0.033µF
No. 6186-4/9
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Pin Description
Pin number
1
Pin name
FC
Vcc
PGND
1
LB1978V
Equivalent circuit
Pin function
Oscillator and ripple suppression pin.
The higher the capacitance connected to
FG, the more effectively will ripple
components be suppressed.
2
3
4
OSC
COM
IRF
Vcc
SGND
Vcc
PGND
2
Vcc
120µA
10kΩ
Startup pulse cycle and drive switching
cycle setting pin.
Increased capacitance will result in higher
startup pulse cycle and drive switching
cycle.
Startup waveform detector offset setting
3
pin.
R
=1 kΩ results in approx. 25 mV
COM
offset at startup
Oscillator circuit and F-V servo circuit
internal current setting pin.
4
25µA
SGND
5
CI
Vcc
Speed adjustment pin using CR
oscillation based on FG pulse edge
detection.
5
SGND
Continued on next page
No. 6186-5/9
Page 6
Continued from preceding page
Pin number
6
Pin name
PW
Vcc
PGND
LB1978V
Equivalent circuit
Pin function
CI pin waveform and reference voltage
comparator output pin.
6
7
8
9
PV
IV
VI
Vcc
SGND
Vcc
SGND
Vcc
9
1kΩ
1kΩ
1kΩ
Current buffer input/output pin.
7
Current-to-voltage converter comparator
input pin.
8
Voltage-to-current converter input pin.
Speed increases when VI pin voltage is
higher than reference voltage and
decreases when VI pin voltage is lower
than reference voltage.
10
BRI
SGND
Vcc
10
SGND
Brake bias pin.
When S/S pin is Low and BR1 pin is 0.9V
or higher, brake drive pin BR2 goes ON.
Continued on next page
No. 6186-6/9
Page 7
Continued from preceding page
Pin number
11
Pin name
BR2
Vcc
SGND
LB1978V
Equivalent circuit
11
Pin function
Brake drive pin.
When S/S pin is Low and BR1 pin is 0.9V
or higher, brake drive is activated.
This is an open-collector output.
12
13
14
15
16
17
18
19
20
21
TC1
TC2
P1
P2
P3
SGND
DU
U2
V2
W2
18
Vcc
SGND
Vcc
SGND
12
13
19 20
14
15
16
Vcc
21
Motor current rise/fall slope setting pins.
Setting value changes depending on the
High or Low status of the F/S pin.
Internal operation measurement pins
which shape the current waveform.
Must be left open for use.
Signal ground pin.
Separate from power supply ground.
DU is base pin for U low-speed output
transistor.
U2, V2, and W2 are pins for connection to
low-speed motor coils.
22
PGND
22
PGND
Power supply ground.
Continued on next page
No. 6186-7/9
Page 8
Continued from preceding page
Pin number
23
24
25
Pin name
U1
V1
W1
Vcc
PGND
22
LB1978V
Equivalent circuit
23 24 25
Pin function
U1, V1, and W1 are pins for connection to
high-speed motor coils.
26
27
28
F/S
DR
S/S
Vcc
26
SGND
Vcc
27
SGND
28
Vcc
High-speed/low-speed mode select pin.
Vcc –1.0V or lower: high-speed (fast)
Vcc –0.3V or higher: low-speed (slow)
Rotation direction select pin.
Vcc –0.3V or higher: phase sequence
U -> V -> W
Vcc –1.0V or lower: phase sequence
U -> W -> V
Start/stop pin.
0.9V or higher: Start
High active.
29
30
Vref
Vcc
Vcc
29
SGND
SGND
Reference voltage pin.
Reference voltage is 0.75V.
50µA
Power supply pin.
No. 6186-8/9
Page 9
LB1978V
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.
PS
No. 6186-9/9
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