LB1978V
No. 6186-1/9
LB1978V
Package Dimensions
unit: mm
3191-SSOP30
Functions and Features
Three-phase sensorless motor driver
Built-in speed control
Built-in reference voltage and forward/reverse
switching pin
Soft switching
Built-in short brake drive pin
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.
63099RM(KI)
Ordering number : EN6186
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Monolithic Digital IC
Three-Phase Half-Wave Sensorless Motor Driver
for Headphone Stereos
[LB1978V]
SANYO : SSOP30
Specifications
Absolute Maximum Ratings
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
Vcc max
2.0
V
Output transistor withstand voltage
Vsus
4
V
Maximum output current
Io max
0.6
A
Allowable power dissipation
Pd max
Tj = 125C
0.4
W
Operating temperature
Topr
0 to 60
C
Storage temperature
Tstg
40 to +125
C
Allowable Operating Ranges
at Ta = 25C
Parameter
Symbol
Conditions
Ratings
Unit
Power supply voltage
Vcc
1.0 to 1.7
V
1
15
16
7.6
0.65
9.95
0.5
5.6
0.1
1.6max
1.0
30
0.22
0.43
0.15
LB1978V
No. 6186-2/9
Electrical Characteristics
at Ta = 25C, Vcc = 1.2V, in the specified test circuit
Parameter
Symbol
Conditions
Ratings
Unit
min
typ
max
Power supply current
Icc
START pin H, RIRF = 180 k
6.8
10
mA
START pin L, VBR = 0V
0
10
A
Reference voltage
Vref
0.725
0.755
0.785
V
Reference voltage characteristics
Vref
/
Vcc Vcc = 1.0 to 1.7V
1.0
2.0
%/V
Iref
Reference voltage load characteristics
Vref
Iref = 0 to 50
A
0.2
0.06
mV/
A
Iref
Oscillator cycle
T
S
C
S
= 1500 pF
0.52
0.6
0.68
ms
Rotation switching load characteristics
T
F/S
C
S
= 1500 pF,
7.70
10.9
ms
R
IRF
= 180 k
*Target
Rotation detection accuracy
NF/S
T
S
= 0.60 ms *Target
16
+16
%
COM voltage
V
COM
R
COM
= 1 k
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
SSH
0.9
V
S/S pin input Low level voltage
V
SSL
0.3
V
F/S DR pin ON voltage
V
Lon
0.2
V
F/S DR pin OFF voltage
V
Loff
Vcc0.3
V
TC pin pull-in voltage
V
TC
1
F/S = H
80
110
150
mV
V
TC
2
F/S = L
160
220
300
mV
BR1 ON voltage
V
BRon
0.9
V
BR1 OFF voltage
V
BRoff
0.3
V
BRsat voltage
V
BRsat
Io = 6 mA, V
BR1
= 1.2V
0.15
0.3
V
CI rise voltage
V
CI
0.620
0.650
0.680
V
CI hysteresis width
V
CI
60
80
100
mV
IRF voltage
V
IRF
R
IRF
= 180 k
0.725
0.755
0.785
V
VI output current
I
VI
V
VI
= 0.3V, V
IV
= GND
26
30
34
A
PV pin voltage
V
PV
0.720
0.755
0.785
V
IFC/
VVI ratio
I
FC
/
V
VI
150
210
250
A/V
Output transistor OFF voltage
V
OUT
OFF
Vcc0.3
V
Output transistor ON voltage
V
OUT
ON
0.3
V
Note: Items shown to be "Target" are not measured.
LB1978V
No. 6186-3/9
Pd max Ta
Allowable power dissipation, Pd max (W)
0.26
0.4
0
25
60
Ambient temperature, Ta (
C)
Pin Assignment
30
28
29
27
25
26
24
22
23
21
19
20
18
16
17
1
3
2
4
6
5
7
9
8
10
12
11
13
15
14
FC
OSC
COM
IRF
CI
PW
PV
IV
VI
BR1
BR2
TC1
TC2
P1
P2
Vcc
VREF
S/S
DR
F/S
W1
V1
U1
PGND
W2
V2
U2
DU
SGND
P3
Top view
LB1978V
LB1978V
No. 6186-4/9
Equivalent Circuit Block Diagram
Sample Application Circuit
Oscillator
Divider
Rotation
detector
Brake
circuit
Constant
current circuit
Startup
detection
Current bias
Reference
voltage
Speed
select
divider
d/dt
Pulse
Current
buffer
VI
PGND
DU
FC
W2
V2
U2
W1
V1
U1
BR2
BR1
P3
P2
P1
TC2
TC1
DR
IRF
COM
S/S
Vref
SGND
F/S
CI
PW
PV IV
VI
Startup
switching
Soft switching
Vcc
OSC
Logic circuitry
FG pulse
Drive select + predriver
Soft switch
Comparator
30
28
29
27
25
26
24
22
23
21
19
20
18
16
17
1
3
2
4
6
5
7
9
8
10
12
11
13
15
14
Vcc VREF S/S
DR
F/S
W1
V1
U1
PGND W2
V2
U2
DU SGND P3
OSC COM IRF
FC
CI
PW
PV
IV
VI
BR1 BR2 TC1 TC2
P1
P2
0.33
F
0.1
F
680k
180
k
6.2k
0.1
F
0.033
F
20k
68k
180
k
2.2
F
1500pF
0.01
F
1k
0.01
F
0.01
F
0.01
F
1
F
100
LB1978V
LB1978V
No. 6186-5/9
Pin number
1
2
3
4
5
Pin Description
Pin name
FC
OSC
COM
IRF
CI
Equivalent circuit
Pin function
Oscillator and ripple suppression pin.
The higher the capacitance connected to
FG, the more effectively will ripple
components be suppressed.
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
pin.
R
COM
= 1 k
results in approx. 25 mV
offset at startup
Oscillator circuit and F-V servo circuit
internal current setting pin.
Speed adjustment pin using CR
oscillation based on FG pulse edge
detection.
Continued on next page
Vcc
PGND
1
Vcc
SGND
2
Vcc
PGND
3
10k
120
A
Vcc
SGND
4
25
A
Vcc
SGND
5
LB1978V
No. 6186-6/9
Pin number
6
7
8
9
10
Continued from preceding page
Pin name
PW
PV
IV
VI
BRI
Equivalent circuit
Pin function
CI pin waveform and reference voltage
comparator output pin.
Current buffer input/output pin.
Current-to-voltage converter comparator
input pin.
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.
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
Vcc
PGND
6
1k
Vcc
SGND
7
1k
Vcc
SGND
8
Vcc
SGND
9
1k
Vcc
SGND
10
LB1978V
No. 6186-7/9
Pin number
11
12
13
14
15
16
17
18
19
20
21
22
Continued from preceding page
Pin name
BR2
TC1
TC2
P1
P2
P3
SGND
DU
U2
V2
W2
PGND
Equivalent circuit
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.
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.
Power supply ground.
Vcc
SGND
11
Vcc
SGND
13
12
Vcc
SGND
15
14
16
Vcc
PGND
19
20
21
22
18
Continued on next page
LB1978V
No. 6186-8/9
Pin number
23
24
25
26
27
28
29
30
Continued from preceding page
Pin name
U1
V1
W1
F/S
DR
S/S
Vref
Vcc
Equivalent circuit
Pin function
U1, V1, and W1 are pins for connection to
high-speed motor coils.
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.
Reference voltage pin.
Reference voltage is 0.75V.
Power supply pin.
Vcc
PGND
23
24
25
22
Vcc
SGND
26
Vcc
SGND
27
Vcc
SGND
28
Vcc
SGND
50
A
29
LB1978V
No. 6186-9/9
This catalog provides information as of June, 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.
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