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Ordering number : EN7633A
Monolithic Digital IC
LB1945D
Overview
PWM Current Control
Stepping Motor Driver
The LB1945D is a PWM current control stepping motor driver that uses a bipolar drive technique. It is optimal for use with the carriage and paper feed stepping motors used in printers.
Functions and Features
* PWM current control (external clock) * Digital load current selection function (supports 1-2, W1-2, and 2-phase excitation) * Built-in high and low side diodes * Simultaneous on state prevention function (through-current prevention) * Built-in thermal shutdown circuit * Noise canceling function
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Motor supply voltage Output peak current Output continuous current Logic system supply voltage Logic input voltage range Emitter output voltage range Allowable power dissipation Operating temperature Storage temperature Symbol VBB max IO peak IO max VCC max VIN VE Pd max Topr Tstg Independent IC tW 20s Conditions Ratings 30 1.0 0.8 6.0 -0.3 to VCC 1.0 2.8 -20 to +90 -55 to +150 Unit V A A V V V W C C
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to "standard application", intended for the use as general electronics equipment (home appliances, AV equipment, communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee thereof. If you should intend to use our products for applications outside the standard applications of our customer who is considering such use and/or outside the scope of our intended standard applications, please consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our customer shall be solely responsible for the use. Specifications of any and all SANYO Semiconductor Co.,Ltd. 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.
41107 TI PC B8-6489, 6394 No.7633-1/9
LB1945D
Recommended Operating Range at Ta = 25C
Parameter Motor supply voltage Logic system supply voltage Reference voltage Symbol VBB VCC VREF Conditions Ratings 10 to 28 4.75 to 5.25 1.5 to 5.0 Unit V V V
Electrical Characteristics at Ta = 25C, VBB = 24V, VCC = 5V, VREF = 5V
Parameter Output block Output stage supply current Output saturation voltage 1 Output saturation voltage 2 Output saturation voltage 3 Output saturation voltage 4 Output leakage current IBB ON IBB OFF VO sat1 VO sat2 VO sat3 VO sat4 VO1(leak) VO2(leak) VSUS I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V ENABLE = 3.2V IO = +0.5A, sink side IO = +0.8A, sink side IO = -0.5A, source side IO = -0.8A, source side VO = VBB, sink side VO = 0V, source side L = 3.9mH, IO = 1.0A* -50 30 V 0.3 0.5 1.6 1.8 0.5 1.0 2.0 0.2 0.5 0.7 1.8 2.0 50 V V V V A mA Symbol Conditions min Ratings typ max Unit
Output sustain voltage Logic block Logic supply current
ICC ON ICC OFF VIH VIL IIH IIL VREF/ VSEN IREF ICR TS TSHY
I1 = 0.8V, I2 = 0.8V, ENABLE = 0.8V ENABLE = 3.2V
50 7 3.2
70.0 10.0
92 13
mA
Input voltage
1.8 VIH = 3.2V VIL = 0.8V I1 = 0.8V, I2 = 0.8V I1 = 3.2V, I2 = 0.8V I1 = 0.8V, I2 = 3.2V VREF = 5.0V, I1 = 0.8V, I2 = 0.8V CR = 1.0V 35 7 9.5 13.5 25.5 17.5 -1.0 170 40 50 10 10 15 30 25 65 13 10.5 16.5 34.5 32.5
V A
Input current Set current control threshold value Reference current CR pin current Thermal shutdown temperature Thermal shutdown hysteresis
A A C C
*: The design specification items are design guarantees and are not measured.
Package Dimensions
unit:mm (typ) 3147C
3.5
Pd max - Ta
Independent IC
28
15
Allowable power dissipation, Pd max - W
3.0 2.8 2.5
R1.7
12.7 11.2
8.4
1
20.0 26.75
14
0.4
2.0
1.5
1.34
1.0
4.0
0.5 0 -20
4.0
(1.81)
1.78
0.6
1.0
0
20
40
60
80
100
Ambient temperature, Ta - C
SANYO : DIP28H(500mil)
No.7633-2/9
LB1945D
Pin Assignment
ENABLE1
SUBGND
D-GND
PHASE1
VREF1 16 13 VREF2
OUTA
OUTA
VBB
28
27
26
25
24
E1
23
22
21
20
19
18
17
15
LB1945D
1 OUTB
2 OUTB
3 NC
4 SUBGND
5 VBB
6 E2
7 D-GND
8 CR
9 PHASE2
10 ENABLE2
11 IB2
12 IB1
14 S-GND Top view
ILB01555
Pin Functions
Pin No. 22 5 24 6 27 28 2 1 15 14 4, 25 23 7 8 16 13 20 9 19 10 17, 18 12, 11 21 CR VREF1 VREF2 PHASE1 PHASE2 ENABLE1 ENABLE2 IA1, IA2 IB1, IB2 VCC Chopping is performed at the period of a triangle wave set by the RC circuit connected to this pin. The triangle wave off time is the noise cancellation time. Output current settings. (The output current is determined by providing an input in the range 1.5V to 5V.) Output phase switching inputs High-level input: OUTA = high, OUTA = low Low-level input: OUTA = low, OUTA = high Output on/off control inputs High-level input: Output off Low-level input: Output on Output current setting digital inputs. The output current is set to 1/3, 2/3 or 1 by input high/low levels to these pins. Logic block power supply voltage Pin VBB1 VBB2 E1 E2 OUTA OUTA OUTB OUTB GND S-GND SUBGND D-GND Ground Sense ground IC sub-ground Low side built-in diode ground (anode side) Output pins Output stage power supply voltage High side diode cathode connection The set current is controlled by inserting resistors RE between these pins and ground. Description
GND
VCC
IA2
IA1
NC
No.7633-3/9
LB1945D
Block Diagram
ENABLE2 PHASE2 SUBGND VREF2 VCC IB1 S-GND IB2
Control logic circuit
Current selection circuit
VBB2 Blanking time OUTB E2 OUTB D-GND
VBB1
Thermal shutdown circuit
OSC
CR
D-GND OUTA E1 OUTA Blanking time
Control logic circuit
Current selection circuit
VREF1
ENABLE1
SUBGND
PHASE1
GND
ILB01559
IA1
IA2
No.7633-4/9
LB1945D
Application circuit
Motor L 1 2 3 4 5 0.5 6 7 820pF 8 56k 9 10 Logic input 11 12 13 14 IB2 IB1 VREF2 S-GND IA2 18 IA1 17 VREF1 16 GND 15 PHASE2 ENABLE2 PHASE1 20 ENABLE1 19 CR E2 D-GND D-GND 23 VBB 22 OUTB OUTB NC SUBGND VBB OUTA OUTA 28 27
Motor L
NC 26 SUBGND 25 0.5 E1 24
24V 47F 5V 10F
LB1945D
VCC 21
Logic input
10F 5V
ILB01556
No.7633-5/9
LB1945D
Truth Table
ENABLE Low Low High PHASE High Low OUTA High Low OFF OUTA Low High OFF
I1 Low High Low High
I2 Low Low High High
Output current Vref/(10 x RE) = IOUT Vref/(15 x RE) = IOUT x 2/3 Vref/(30 x RE) = IOUT x 1/3 0
Note: The output is turned off when ENABLE is high or in the I1 = I2 = high state.
Clockwise/counterclockwise Operating Sequence
2-phase excitation drive
Clockwise rotation
No. 0 1 2 3 PHASE1 0 1 1 0 OUTA 0 1 1 0 OUTA 1 0 0 1 PHASE2 0 0 1 1 0 0 1 1
IA1 = IA2 = IB1 = IB2 = 0
OUTB OUTB 1 1 0 0
Counterclockwise rotation
No. 0 1 2 3 PHASE1 0 1 1 0 OUTA 0 1 1 0 OUTA 1 0 0 1 PHASE2 1 1 0 0 1 1 0 0
IA1 = IA2 = IB1 = IB2 = 0
OUTB OUTB 0 0 1 1
Control Sequence
2-phase excitation
Table 1
Phase A NO 0 1 2 3 PH1 0 1 1 0 IA2 0 0 0 0 IA1 0 0 0 0 Current value 1 1 1 1 PH2 0 0 1 1 IB2 0 0 0 0 Phase B IB1 0 0 0 0 Current value 1 1 1 1
ENABLE1 = ENABLE2 = 0
1-2 phase excitation - 1/2 step
Table 2
Phase A No. 0 1 2 3 4 5 6 7 PH1 0 0 * 1 1 1 * 0 IA2 0 0 1 0 0 0 1 0 IA1 0 1 1 1 0 1 1 1 Current value 1 2/3 0 2/3 1 2/3 0 2/3 PH2 * 0 0 0 * 1 1 1 IB2 1 0 0 0 1 0 0 0
ENABLE1 = ENABLE2 = 0
Phase B IB1 1 1 0 1 1 1 0 1 Current value 0 2/3 1 2/3 0 2/3 1 2/3
No.7633-6/9
LB1945D
1-2 phase Excitation Timing Chart
PH1
IA2
IA1
PH2
IB2
IB1
IOUT1
VOUT1
0 IOUT2
1
2
3
4
5
6
7
VOUT2
1 cycle = T
ILB01558
No.7633-7/9
LB1945D
W1-2 phase excitation - about 1/4 step Table 3
Phase A NO 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 PH1 0 0 0 0 * 1 1 1 1 1 1 1 * 0 0 0 IA2 0 0 0 1 1 1 0 0 0 0 0 1 1 1 0 0 IA1 0 0 1 0 1 0 1 0 0 0 1 0 1 0 1 0 Current value 1 1 2/3 1/3 0 1/3 2/3 1 1 1 2/3 1/3 0 1/3 2/3 1 PH2 * 0 0 0 0 0 0 0 * 1 1 1 1 1 1 1 IB2 1 1 0 0 0 0 0 1 1 1 0 0 0 0 0 1
ENABLE1 = ENABLE2 = 0
Phase B IB1 1 0 1 0 0 0 1 0 1 0 1 0 0 0 1 0 Current value 0 1/3 2/3 1 1 1 2/3 1/3 0 1/3 2/3 1 1 1 2/3 1/3
W1-2 phase Excitation Timing Chart
PH
IA
IA
PH
IB
IB
IOUT VOU
0 IOUT VOU
1
2
3
4
5
6
7
8
9
10
11
12
13 14
15
1 cycle =
ILB01557
No.7633-8/9
LB1945D
Simplified Equations for Determining RC Component Values
The equations for setting the RC oscillator circuit rise time (T1) and fall time (T2) are shown below. T1 0.44C x R (s) T2 0.72 x ( C x R x 1000 )/( R + 1000 ) (s) (C:220 to 4700pF, R = 10 to 150k) The oscillator frequency must be set using the simplified equations shown above. Note that the triangle wave fall time (T2) is also used as the noise canceller time.
Motor
CR
T2
T1
T2
Usage Notes
1. VREF Since the VREF pin is the input pin for the reference voltage that sets the current, applications must be designed so that noise does not appear on this pin. 2. Ground pins Since this IC switches high currents, the following points concerning grounding must be observed. * The fins on the package rear surface, pins 7 and 8, and pins 21 and 22 must all be grounded. * Sections of the circuit that carry large currents must be implemented with wide lines in the printed circuit pattern, and must be physically separated from the small signal system. * The E pin sense resistor (RE) must be position as close as possible to the IC ground (pin 14). * The capacitors between VCC and ground and between VBB and ground must be positioned as close as possible to the VCC and VBB pins on the printed circuit pattern.
SANYO Semiconductor Co.,Ltd. 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 Semiconductor Co.,Ltd. products described or contained herein. SANYO Semiconductor Co.,Ltd. strives to supply high-quality high-reliability products, however, any and all semiconductor products fail or malfunction with some probability. It is possible that these probabilistic failures or malfunction could give rise to accidents or events that could endanger human lives, trouble that could give rise to smoke or fire, or accidents 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 Semiconductor Co.,Ltd. products described or contained herein are controlled under any of applicable local export control laws and regulations, such products may require 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 consent of SANYO Semiconductor 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 Semiconductor Co.,Ltd. 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. Upon using the technical information or products described herein, neither warranty nor license shall be granted with regard to intellectual property rights or any other rights of SANYO Semiconductor Co.,Ltd. or any third party. SANYO Semiconductor Co.,Ltd. shall not be liable for any claim or suits with regard to a third party's intellctual property rights which has resulted from the use of the technical information and products mentioned above.
This catalog provides information as of April, 2007. Specifications and information herein are subject to change without notice. PS No.7633-9/9

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