Datasheet LB1854M Datasheet (SANYO)

Monolithic Digital IC

Ordering number : EN4476B

O3097HA (OT)/31795TH (OT) No. 4476-1/6

SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters

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

Three-Phase Brushless Motor Driver IC

LB1854M

Overview

The LB1854M is a three-phase brushless motor driver IC
and is optimal, in particular, for driving VCR capstan and
drum motors.

Features

• 120° voltage linear drive technique

• The LB1854M soft switching scheme allows smaller
external capacitors to be used (e.g., chip capacitors).

• Built-in thermal-shutdown function

• Built-in overcurrent protection circuit

• Built-in FG amplifiers (operational amplifier and
Schmitt amplifier)

• Control start voltage set by an external voltage

• The output current feedback level can be changed by
changing the control gain to one of two levels.

Package Dimensions

unit: mm

3073A-MFP30S

SANYO: MFP30S

[LB1854M]

Specifications

Absolute Maximum Ratings at Ta = 25°C

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions Ratings Unit

Maximum supply voltage

V

CC

1 max 20 V

V

CC

2 max 7.0 V

Applied output voltage V

OU, V, W

22 V

Maximum output current I

OUT

max 1.5 A
Allowable power dissipation Pd max 1.05 W
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –55 to +150 °C

Parameter Symbol Conditions Ratings Unit

Supply voltage

V

CC

1 5 to 18 V

V

CC

2 4.3 to 6.5 V

No. 4476-2/6

LB1854M

Electrical Characteristics at Ta = 25°C, VCC1 = 12 V, VCC2 = 5 V

Note: * Items marked with an asterisk are design target values and are not measured.

Parameter Symbol Conditions min typ max Unit

Current drain

I

CC

1 VC= 0 V, RL= ∞ 17 30 mA

I

CC

2 VC= 0 V 6.5 9.5 mA

[Drive Block]

Output saturation voltage

V

O

(sat) 1 I

OUT

= 0.5 A, sink + source 1.6 2.2 V

V

O

(sat) 2 I

OUT

= 1.0 A, sink + source 2.0 3.0 V
Output TRS breakdown voltage V

O

(sus) I

OUT

= 20 mA* 20 V
Output resting potential V

OQ

VC= 0 V 5.7 6.0 6.3 V

Hall amplifier input offset voltage V

H

offset –5 +5 mV

Hall amplifier input bias current I

H

bias 1 5 µA

Hall amplifier common mode

V

H

ch 1.3 2.2 V

input voltage range
Hall input/output voltage gain GV

HO

43 46 49 dB

[Control Block]

Control output drive gain

GV

CO

1 High gain 37 40 43 dB

GV

CO

2 Low gain 31 34 37 dB

Control output CH difference ∆GV

CO

–2 +2 dB

Control start voltage V

CTH

When V

OUT

p-p = 2 V 2.5 V
Gain control switching high level 4 5 V
Gain control switching

Middle level when the input is open 2 3 V

middle level
Gain control switching low level 0 1 V
[FG Amplifier]
FG amplifier input offset voltage V

FG

offset –8 +8 mV

Open-loop voltage gain GV

FG

f = 1 kHz 60 dB

Source output saturation voltage V

FG OUIO

= 2 mA 37 V

Sink output saturation voltage V

FG ODIO

= –2 mA 1.3 V

Common-mode signal

CHR

*

80 dB

rejection ratio
FG amplifier common-mode

V

FG CH

0 3.5 V

input voltage range
Phase margin * 20 Deg

Schmitt hysteresis

∆Vsh1 FG

OUT

2: High to low 22 mV

∆Vsh2 FG

OUT

2: Low to high 22 mV

Schmitt input voltage range Vsh

CH

0.7 3.5 V
[Thermal Shutdown]
Operating temperature TSD * 150 180 210 °C
Hysteresis ∆TSD * 15 °C

No. 4476-3/6

LB1854M

Pin Assignment

Block Diagram

Sample Application Circuit

Unit (resistance: Ω, capacitance: F)

V

CREF

V

C

No. 4476-4/6

LB1854M

Truth Table

Input high: Phase 1 is 0.2 V or more higher than the corresponding phase 2 for each phase input.
Low: Phase 1 is 0.2 V or more lower than the corresponding phase 2 for each phase input.
Forward and reverse control high: 2.3 V to V

CC

1

Low: 0 V to 0.7 V

Pin Functions

Unit (resistance: Ω)

Source

Input

Forward and reverse control

Sink

U V W

F/RC

1

W phase

→ V phase

H H L

L

V phase → W phase H

2

W phase → U phase

H L L

L

U phase → W phase H

3

V phase → W phase

L L H

L

W phase → V phase H

4

U phase → V phase

L H L

L

V phase → U phase H

5

V phase → U phase

H L H

L

U phase → V phase H

6

U phase → W phase

L H H

L

W phase → U phase H

Pin No. Symbol Pin voltage Equivalent circuit Function

1, 2, 14,

15, 16,
17, 29,

30

3

4

5

6

FRAME

(GND)

FC

V

C REF

V

C

VCC1

1.5 V min
V

CC

2 max

0 V min
VCC2 max

5 to 18 V

Ground for all circuits except the outputs

The gain frequency characteristics can be lowered by
connecting a capacitor between this pin and ground to
prevent oscillation.

Speed control
The LB1854M implements a voltage control scheme in

which the output voltage is controlled by the pin 5 voltage.
The pin 4 voltage determines the control start voltage.

Power supply that provides the drive outputs

No. 4476-5/6

LB1854M

Continued from preceding page.

Unit (resistance: Ω)

Pin No. Symbol Pin voltage Equivalent circuit Function

7
8
9

10

11

12

13

18

19

U

OUT

V

OUT

W

OUT

R

f

VCC2

CL

GC

FG

OUT

2

FG

OUT

1

4.3 to 6.5 V

0 V min
V

CC

2 max

0 V min
V

CC

2 max

Output pins

Output transistor ground
Feedback can be applied to the control amplifier by

inserting resistor between this pin and GND and detecting
the output current as a voltage. The overcurrent
protection circuit (current limiter) operates by detecting
the voltage on this pin.

Power supply provided to all blocks other than the output
block

This voltage must be stabilized so that no ripple or other
noise is present.

The current limiter operates when the R

f

pin reaches the
same potential as pin 12. The pin 12 potential is set up
externally.

Control input to output gain switching pin
High level (4 to 5 V): 34 dB

Middle level (2 to 3 V) or open: 40 dB (low speed):
34 dB (high speed)
Low level (0 to 1 V): 40 dB

However, note that this applies when V

CC

2 is 5 V.

FG Schmitt amplifier output

FG amplifier output

Continued on next page.

No. 4476-6/6

LB1854M

This catalog provides information as of November, 1997. Specifications and information herein are subject to
change without notice.

■ No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.

■ Anyone purchasing any products described or contained herein for an above-mentioned use shall:
➀ Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and

distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:

➁ Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on

SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.

■ 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.

Continued from preceding page.

Unit (resistance: Ω)

Pin No. Symbol Pin voltage Equivalent circuit Function

20
21

22

23
24
25
26
27
28

FG

IN

–

FG

IN

+

FRC

W

IN

2

W

IN

1

V

IN

2

V

IN

1

U

IN

2

U

IN

1

0 V min

3.5 V max
(when V

CC

2 is

5 V)

High: 2.3 V min
Low: 0.7 V max

1.4 V min

2.0 V max

FG signal input

Motor forward/reverse control pin
Low level (0.7 V or lower): forward
High level (2.3 V or higher): reverse

W phase Hall sensor input
Logic high is the W

IN

1 > WIN2 state.

V phase Hall sensor input
Logic high is the VIN1 > VIN2 state.

U phase Hall sensor input
Logic high is the UIN1 > UIN2 state.