Page 1
Overview
The LB1855NM is a 3-phase brushless motor driver IC
that is optimal for VCR drum motor drive.
Features
• Current linear drive
• No output electrolytic capacitors required.
• Current limiter circuit built in
• AGC circuit built in
• Thermal shutdown circuit built in
Package Dimensions
unit: mm
3097-MFP16FS
Monolithic Digital IC
O3098RM (OT) No. 5798-1/5
SANYO: MFP16FS
[LB1855NM]
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
3-Phase Brushless Motor Driver
LB1855NM
Ordering number : EN5798
On the specified printed circuit board (a 20 × 30 × 1.5 mm glass3epoxy board)
Ambient temperature, Ta — °C
Allowable power dissipation, Pd max — W
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max 20 V
Maximum output current I
O
max 1.2 A
Allowable power dissipation Pd max
On the specified printed circuit board (a 20 × 30 × 1.5 mm
3
1.2 W
glass epoxy board)
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –55 to +150 °C
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Supply current V
CC
7 to 18 V
Hall input amplitude V
HALL
Between the Hall inputs 70 to 300 mVp-p
Allowable Operating Ranges at Ta = 25°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.
Page 2
No. 5798-2/5
LB1855NM
Parameter Symbol Conditions
Ratings
Unit
min typ max
Supply current I
CC
VC= GND 8 mA
Reference voltage V
REFIR
= 8 mA 6.0 6.3 6.6 V
[Saturation voltage]
Upper side V
sat
1 IO= 1 A 1.5 1.9 V
Lower side V
sat
2 IO= 1 A 0.8 1.2 V
[Leakage current]
Upper side I
OL
1 VCC= 18 V 50 µA
Lower side I
OL
2 VCC= 18 V 50 µA
[Hall Amplifier]
Input offset voltage V
HO
* –10 +10 mV
Common-mode input voltage range V
HCM
2.2 VCC– 0.7 V
[Control Amplifier]
Control reference voltage V
REF
1 (the V
CREF
pin voltage) × 23/16 2.1 2.3 2.5 V
Control Gm VG Rf = 1Ω 1 A/V
Input current I
IN
10 µA
[Thermal Shutdown Circuit]
Operating temperature T
TSD
* 180 °C
Hysteresis ∆T
TSD
* 15 °C
Note: Items marked with an asterisk (*) are design target values and are not tested.
However, note that certain motors may require output capacitors to prevent oscillation.
Pin Assignment
Block Diagram
Electrical Characteristics at Ta = 25°C, VCC= 12 V
Page 3
Pin No. Pin Pin voltage (V) Pin description Equivalent circuit
No. 5798-3/5
LB1855NM
Sample Application Circuit
Hall input voltage range: 2.2 to (VCC– 0.7) V DC
70 mV p-p to 300 mV p-p AC
Truth Table
Input: “H” indicates that the input phase 1 is at least 0.2 V higher than phase 2.
“L” indicates that the input phase 1 is at least 0.2 V lower than phase 2.
1 FC
• Frequency characteristics correction
Oscillation in the current control closed loop can be prevented
by inserting a capacitor between this pin and VREF.
Item Source → sink
Input
U V W
1 V phase →W phase H H L
2 U phase → W phase H L L
3 W phase →V phase L L H
4 V phase → U phase L H L
5 U phase → V phase H L H
6 W phase →U phase L H H
Pin Functions
2
V
CC
7 to 18 • Power supply pin
3
4
5
W
OUT
V
OUT
U
OUT
• Outputs pin
6
R
f
• Ground for the output transistor
The output current can be detected as a voltage by inserting the
resistor Rf between this pin and ground to provide fixed current
drive. The current limiter also operates by detecting this voltage.
Continued on next page.
However, note that certain motors may require output capacitors to prevent oscillation.
Page 4
No. 5798-4/5
LB1855NM
Continued from preceding page.
Pin No. Pin Pin voltage (V) Pin description Equivalent circuit
7 AGC
• AGC pin
The Hall amplifier gain can be controlled according to the
amplitude of the Hall input by inserting a capacitor between this
pin and ground.
8
V
REF
• Internal reference voltage. About 6.3 V.
9
10
11
12
13
14
U
IN
1
U
IN
2
V
IN
1
V
IN
2
W
IN
1
W
IN
2
2.2 to
V
CC
– 0.7
• Hall element inputs pin
15
16
V
CREF
V
C
0 to 5
• Speed control pin
This IC adopts a current control type in which the output current
is controlled by the pin 16 voltage. The control start voltage
changes about 1.3 to 1.4 V if pin 15 is connected to ground.
Page 5
PS No. 5798-5/5
LB1855NM
This catalog provides information as of October, 1998. 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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