Datasheet LB1945H Datasheet (SANYO)

Ordering number : ENN*6193

LB1945H

PWM Current Control Type Stepping Motor Driver

Preliminary
Features

• PWM current control (external excitation)

• Load current digital selection (1–2, W1–2, and 2 phase
excitation drives possible)

• Built-in upper/lower diode

• Simultaneous ON prevention function (feedthrough
current prevention)

• Built-in thermal shutdown circuit

• Built-in noise canceler

Package Dimensions

unit: mm

3233-HSOP28H

[LB1945H]

15.3

6.2

28 15

7.9

2.7

Monolithic Digital IC

LB1945H

0.65

4.9

10.5

114

0.85

2.25

2.5max

0.1

0.8

0.3

0.25

SANYO : HSOP28H

Specifications

Absolute Maximum Ratings at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Maximum motor supply voltage VBB max 30 V
Output peak current I OPEAK tw ≤ 20 µs 1.0 A
Output continuous current I O max 0.8 A
Logic supply voltage VCC max 6.0 V
Logic input voltage range VIN max –0.3 to VCC V
Emitter output voltage VE max 1.0 V
Allowable power dissipation Pd max Ta = 25˚C, with specified substrate* 1.9 W
Operating temperature Topr –20 to +90 °C
Storage temperature Tstg –55 to +150 °C

* Specified substrate: 114.3 × 76.1 × 1.6 mm

Allowable Operating Ranges at Ta = 25°C

Parameter Symbol Conditions Ratings Unit
Motor supply voltage VBB 10 to 28 V
Logic supply voltage VCC 4.75 to 5.25 V
Reference voltage VREF 1.5 to 5.0 V

3

, glass epoxy

1.3

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

82799RM(KI)

No. 6193-1/7

LB1945H

Electrical Characteristics at Ta = 25°C, VBB = 24V, VCC = 5V, VREF = 5.0V

Parameter Symbol Conditions

Output stage supply current I BB ON I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V 0.5 1.0 2.0 mA

I BB OFF ENABLE = 3.2V 0.2 mA

Output saturation voltage 1 V osat 1 Io = +0.5A sink 0.3 0.5 V

2 V osat 2 Io = +0.8A sink 0.5 0.7 V
3 V osat 3 Io = –0.5A source 1.6 1.8 V

Output Block

Output leakage current I o1(leak) VO = V sink 50 µA

Output sustain voltage V SUS L = 3.9 mH Io = 1.0A *1 30 V
Logic supply current I CC ON I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V 50.0 70.0 92.0 mA

Input voltage V IH 3.2 V

Input current I IH V IH = 3.2V 35 50 65 µA

Set current control threshold Vref/Vsen I1 = 0.8V, I2 = 0.8V 9.5 10 10.5
value I1 = 3.2V, I2 = 0.8V 13.5 15 16.5

Logic Block

Reference current I ref Vref = 5.0V, I1 = 0.8V, I2 = 0.8V 17.5 25 32.5 µA
CR pin current I CR CR = 1.0V –1.0 mA
Thermal shutdown temperature T TSD 170 °C
Temperature hysteresis width ∆T

*1: Assured design target value, not measured

4 V osat 4 Io = –0.8A source 1.8 2.0 V

I o2(leak) VO = 0V source –50 µA

I CC OFF ENABLE = 3.2V 7.0 10.0 13.0 mA

V IL 0.8 V

I IL V IL = 0.8V 7 10 13 µA

I1 = 0.8V, I2 = 3.2V 25.5 30 34.5

TSD

Ratings

min typ max

40 °C

Unit

Truth Table

ENABLE PHASE OUTA OUTA

LHHL

LLLH

H

I1 I2 Output current

L L Vref / (10 × RE) = IOUT

H L Vref / (15 × RE) = IOUT × 2/3

L H Vref / (30 × RE) = IOUT × 1/3

HH 0

Note: Output is OFF when ENABLE = H or when I1 = I2 = H.

–

OFF OFF

–

No. 6193-2/7

Block Diagram

1

2

7

28 27

8

20

19

17

18

16

23

22

21

65

14

13

11

12

9

10

Control

logic

circuit

Thermal

shutdown

circuit

Current

select

circuit

OSC

Blanking

time

VBB2

24

Current

select

circuit

Control

logic

circuit

Blanking

time

PHASE1

ENABLE2

ENABLE1

IA2

IA1

VBB1

OUTA

OUTB

–

OUTA

–

VCC

PHASE2

IB1

IB2

GND

E2

VREF1

E1

VREF2

CR

OUTB

D-GND D -GND

LB1945H

No. 6193-3/7

Pin Assignment

LB1945H

OUTA

OUTA

NC

NC

E1

D- GND

VBB1

VCC

PHASE1

ENABLE1

–

1

2

3

4

5

6

7

28

27

26

25

24

23

22

OUTB

OUTB

NC

NC

VBB2

E2

D- GND

–

LB1945H

8

9

10

21

CR

20

PHASE2

19

ENABLE2

IA2

IA1

VREF1

GND

11

12

13

14

18

17

16

15

IB2

IB1

VREF2

S-GND

Top view

No. 6193-4/7

Sample Application Circuit

C

LB1945H

0.51Ω

47µF

10µF

24V

5V

(1W)

1

OUTA–

2

OUTA

3

NC

4

NC

5

E1

6

D-GND

7

VBB1

LB1945H

8

VCC

9

PHASE1

10

ENABLE1

OUTB

OUTB

NC

NC

VBB2

E2

D-GND

PHASE2

ENABLE2

–

28

LL

27

26

25

24

23

22

21

R

20

19

0.51Ω

82kΩ

(1W)

820pF

Logic input

0.1µF

Voltage from 1.5 to
5V can be applied.

11

IA2

12

IA1

13

VREF1

14

GND S-GND

VREF2

IB2

IB1

18

17

16

15

Logic input

The fin on the bottom of HSOP-28H package and the fins between pins 7 and 8 and 21 and 22 should be grounded.

No. 6193-5/7

LB1945H

Pin Description

Pin name Pin number Function

VBB1 7 Output stage power supply voltage pin.
VBB2 24 Cathode pin for the upper-side diodes.

E1 5 Insert resistor RE between these pins and ground to control set current.
E2 23

OUTA 2 Output pins.

–

OUTA

OUTB 27

OUTB

GND 14 Ground pin.
S–GND 15 Sense ground pin.
D–GND 6 Lower-side internal diode ground (anode)

CR 21 Triangular wave chopping with CR constant setting.

VREF1 13 Output current setting pins.

VREF2 16 (Output current is set by inputting a 1.5V to 7.5V voltage.)
PHASE1 9 Output phase select input pin.
PHASE2 20 High input: OUTA = H, OUTA– = L

ENABLE1 10 Output ON/OFF setting input pins.
ENABLE2 19 High input: output OFF

IA1, IA2 12, 11 Output current setting digital input pins.

IB1, IB2 17, 18 Current is set to 1/3, 2/3, 1 by High and Low combinations.

VCC 8 Logic block power supply voltage pin.

1

–

28

22

Triangular wave OFF time is noise cancel time.

Low input: OUTA = L, OUTA– = H

Low input: output ON

Usage Notes

1. V
Because the V

REF

pin

pin is used as reference voltage input pin for the current setting, care must be taken to prevent

REF

noise from affecting the input.

2. GND pin
Because this IC switches large currents, the ground pattern must be designed with care. The fin on the bottom of the
package and the fins between pins 7 and 8 and 21 and 22 should be grounded. Low-impedance patterns should be
used in blocks where large currents flow, and these blocks should be separated from low-level signal blocks. In
particular, the ground of the sense resistor RE at pin E should be located close to the IC ground. Pattern layout
should be designed so that the capacitors between VCC and ground and VBB and ground are close to VCC and VBB.

No. 6193-6/7

LB1945H

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 August, 1999. Specifications and information herein are subject to change
without notice.

No. 6193-7/7

PS