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Ordering number : ENN7947A
Monolithic Digital IC
LB11948T
Overview
PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver
The LB11948T is a low saturation voltage output PWM current control bipolar drive stepping motor driver. It is optimal for use as the driver for the miniature low-voltage stepping motors used in portable electronic equipment such as portable thermal printers.
Features
* PWM current control (external excitation) * Simultaneous on state prevention function (through current prevention) * Thermal shutdown circuit * Noise canceller function * Low-power mode control pin
Specifications
Maximum Ratings at Ta = 25C
Parameter VS supply voltage Logic system supply voltage Peak output current Continuous output current Emitter output voltage Input voltage Allowable power dissipation Operating temperature Storage temperature Note : Specified PCB: 114.3 x 76.1 x 1.6 mm Symbol VS VCC IOpeak IOmax VE VIN Pdmax Topg Tstg Mounted on the specified PCB* tW 20 S Conditions Ratings -0.3 to +18 -0.3 to +18 0.5 0.4 1.0 -0.3 to VCC 1.2 -20 to +85 -40 to +150 Unit V V A A V V W C C
Recommended Operating Conditions at Ta = 25C
Parameter VS supply voltage VCC supply voltage Reference voltage Symbol VS VCC VREF Conditions Ratings 3.0 to 15 3.0 to 15 0.0 to 0.5 Unit V V V
Any and all SANYO Semiconductor 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 Semiconductor representative nearest you before using any SANYO Semiconductor products described or contained herein in such applications. SANYO Semiconductor 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 products described or contained herein.
N2206 / D1504TN(OT) / 81004TN(OT) No.7947-1/12
LB11948T
Electrical Characteristics at Ta = 25C, VS = VCC = 5 V, VREF = 0.3 V
Parameter [Output Block] IVS OFF VS system supply current Output saturation voltage 1 Output saturation voltage 2 Output saturation voltage 3 Output saturation voltage 4 Output leakage current Upper and lower side output diodes Forward voltage 1 (upper side) Forward voltage 2 (lower side) [Logic Block] ICC OFF VCC system supply current ICC ON ICC wt Input voltage Input current Reference voltage: 1 V Current setting reactive current Reference current CR pin current 1 CR pin current 2 Sense voltage 1 Thermal shutdown temperature Note : Design guarantee value VI on VI off IIN V1V IE IREF ICR1 ICR2 VSEN1 TS VREF = 0.3 V, VE = 0.3 V CR = 0.5 V CR = 3 V VREF = 0.5 V VIN = 5 V IO = 1 mA 70 0.95 -22 -1 -2 1.65 0.475 2.2 0.5 170 2.75 0.525 100 1 -17 PH1 = PH2 = 0 V, EN1 = EN2 = 3.0 V ST = 3.0 V PH1 = PH2 = EN1 = EN2 = 0 V ST = 3.0 V PH1 = PH2 = EN1 = EN2 = ST = 0 V 2.0 0.8 130 1.05 -10.5 6.5 7 10 11 13.5 15 1 mA mA A V V A V mA A A mA V C VF1 VF2 I = 400 mA I = 400 mA 0.9 0.9 1.1 1.1 1.3 1.3 V V IVS ON IVS wt VO(sat) 1 VO(sat) 2 VO(sat) 3 VO(sat) 4 IO1 (leak) IO2 (leak) PH1 = PH2 = 0 V, EN1 = EN2 = 3.0 V ST = 3.0 V PH1 = PH2 = EN1 = EN2 = 0 V ST = 3.0 V PH1 = PH2 = EN1 = EN2 = ST = 0 V IO = +0.2A (source) IO = +0.4A (source) IO = -0.2A (sink) IO = -0.4A (sink) VO = VBB (sink) VO = 0 V (source) -50 0.2 0.3 0.2 0.3 28 40 5 52 1 0.4 0.5 0.4 0.5 50 A mA A V V V V A A Symbol Conditions Ratings min typ max Unit
Truth Table
Channel 1 Input ST H H H L PHASE1 L H Input ENABLE1 L L H OUTA- H L OFF OFF Output OUTA L H OFF OFF PHASE2 L H Input ENABLE2 L L H OUTB- H L OFF OFF Channel 2 Output OUTB L H OFF OFF
Note : Levels shown as an asterisk () can be set to be either high or low.
No.7947-2/12
LB11948T
Package Dimensions unit: mm 3259
Pd max -- Ta
Allowable power dissipation, Pd max -- W
Specified PCB: 114.3 x 76.1 x 1.6 mm PCB material: glass epoxy
SANYO : TSSOP-30 (275mil)
Ambient temperature, Ta -- C
Pin Assignment
Top view
No.7947-3/12
LB11948T
Pin Functions
Pin No. 1 2 3 4 5 6 7 8 9 10 11 12 13 Symbol OUT1- OUT1 NC NC D-GND E1 VS1 NC VCC CR VREF1 NC ENABLE1 Functional descriptions Output Output Unused Unused Lower side internal diode anode connection Constant current control sensing The motor current is set by the value of the sensing resistor Re connected between the E1 pin and ground. The current is set according to the following equation: IO = VREF/Re (A) VS power supply Unused VCC power supply RC oscillator connection Current setting system reference voltage input VREF1 voltage range: 0 to 0.5 V Unused Logic level input The output is turned off when ENABLE1 is low, and the outputs are turned on (operating state) when ENABLE2 is high. Logic level input: phase switching 14 PHASE1 When PHASE1 = high: Output pin states: OUTA: high, OUTA-: low. When PHASE1 = low: Output pin states: OUTA: low, OUTA-: high. Standby mode setting 15 16 17 ST NC 1VREG When ST = high: the IC operates in normal operating mode. When ST = low: the IC operates in standby mode. The VS and VCC current drain levels are under 1 A in this mode. Unused 1 V regulator circuit output The LB11948 includes an internal 1 V regulator circuit, and this pin is the output from that circuit. The VREF1 and VREF2 reference voltages can be set by voltage dividing the 1 V regulator output. Logic level input: phase switching 18 PHASE2 When PHASE2 = high: Output pin states: OUTA: high, OUTA-: low. When PHASE2 = low: Output pin states: OUTA: low, OUTA-: high. 19 20 21 22 23 24 25 26 27 28 29 30 ENABLE2 VREF2 GND PGND NC VS2 E2 D-GND NC NC OUT2 OUT2- Logic level input The output is turned off when ENABLE1 is low, and the outputs are turned on (operating state) when ENABLE2 is high. Current setting reference voltage input VREF2 voltage range: 0 to 0.5 V Ground (small signal circuit system ground) Power system ground (high current circuit system ground) Unused VS power supply Constant current control sensing The motor current is set by the value of the sensing resistor Re connected between the E2 pin and ground. The current is set according to the following equation: IO = VREF/Re (A) Lower side internal diode anode connection Unused Unused Output Output
No.7947-4/12
LB11948T
Block Diagram
10 F ENABLE1
VCC
VS1 OUT1 OUT1Stepping motor
10 F
PHASE1 E1
Control block
ENABLE2
Blanking time
1 _ +
VS2 OUT2 OUT2E2
PHASE2
ST
Blanking time Thermal shutdown circuit Reference voltage 1VREG 30 k 10 k
_ +
1
S-GND
OSC CR VCC VREF2 VREF1 56 k 680 pF
P-GND P-GND
No.7947-5/12
LB11948T
Sample Application Circuit
1
OUT1OUT1 NC NC D-GND E1
OUT2- 30 OUT2 29 NC 28 NC 27 D-GND2 26 1 E2 25
M
2 3 4 5
1 8V
6 7
LB11948T
VS1 NC VCC
VS2 24 NC 23 PGND 22 GND 21 VREF2 20
10 F 10 F 5V 56 k 680pF
8 9
10 CR 11 VREF1 12 NC 13 ENABLE1
ENABLE2 19 Logic level input PHASE2 18 1VREG 17
16
Logic level input
14 PHASE1 15 ST
30 k
10 k
Logic level input PHASE1 PHASE2
90 deg
200 Hz
No.7947-6/12
LB11948T
Drive Sequence Table
2 Phase Excitation Drive Sequence Table 1 Clockwise drive
No. 0 1 2 3 PHASE1 0 1 1 0 ENABLE1 0 0 0 0 OUT1 0 1 1 0 OUT1- 1 0 0 1 PHASE2 0 0 1 1 ENABLE2 0 0 0 0 OUT2 0 0 1 1 OUT2- 1 1 0 0
Table 2 Counterclockwise drive
No. 0 1 2 3 PHASE1 0 1 1 0 ENABLE1 0 0 0 0 OUT1 0 1 1 0 OUT1- 1 0 0 1 PHASE2 1 1 0 0 ENABLE2 0 0 0 0 OUT2 1 1 0 0 OUT2- 0 0 1 1
1-2 Phase Excitation Drive Sequence Table 3 Clockwise drive
No. 0 1 2 3 4 5 6 7 PHASE1 0 0 1 1 1 1 0 0 ENABLE1 0 0 1 0 0 0 1 0 OUT1 0 0 OFF 1 1 1 OFF 0 OUT1- 1 1 OFF 0 0 0 OFF 1 PHASE2 0 0 0 0 1 1 1 1 ENABLE2 1 0 0 0 1 0 0 0 OUT2 OFF 0 0 0 OFF 1 1 1 OUT2- OFF 1 1 1 OFF 0 0 0
Table 4 Counterclockwise drive
No. 0 1 2 3 4 5 6 7 PHASE1 0 0 1 1 1 1 0 0 ENABLE1 0 0 1 0 0 0 1 0 OUT1 0 0 OFF 1 1 1 OFF 0 OUT1- 1 1 OFF 0 0 0 OFF 1 PHASE2 1 1 1 1 0 0 0 0 ENABLE2 1 0 0 0 1 0 0 0 OUT2 OFF 1 1 1 OFF 0 0 0 OUT2- OFF 0 0 0 OFF 1 1 1
No.7947-7/12
LB11948T
2 Phase Excitation Drive Sequence
Clockwise drive
0 PHASE1 PHASE2 ENABLE1 ENABLE2 OUT1 OUT1OUT2 OUT2-
1
2
3
4
5
6
7
: Output off state
Counterclockwise drive 0
1
2
3
4
5
6
7
PHASE1 PHASE2 ENABLE1 ENABLE2 OUT1 OUT1OUT2 OUT2: Output off state
No.7947-8/12
LB11948T
1-2 Phase Excitation Drive Sequence
Clockwise drive
0 PHASE1 PHASE2 ENABLE1 ENABLE2 OUT1 OUT1OUT2 OUT2-
1
2
3
4
5
6
7
: Output off state
Counterclockwise drive 0
1
2
3
4
5
6
7
PHASE1 PHASE2 ENABLE1 ENABLE2 OUT1 OUT1OUT2 OUT2: Output off state
No.7947-9/12
LB11948T
Switching Operation Timing Chart
OUTA
OUTA
IO
Spike noise
E1
CR
tn
tn: The noise canceller operating time
No.7947-10/12
LB11948T
Usage Notes Simplified Formulas for Determining Resistor and Capacitor Values The formulas for setting the rise time (T1) and the fall time (T2) for the RC oscillator are shown below. T1 0.44C R (s) T2 0.72 (CR100)/(R + 1000) (s) Set the oscillator frequency using the simplified formulas shown above. Note that the T2 triangle wave fall time is the noise canceller circuit operating time.
R C c irc u it w a ve fo rm
T1
T2
Setting the Constant Current Level The reference voltage VREF1 and VREF2 can be set by voltage dividing the 1 V regulator output. The output current is set by the voltage applied to the VREF pins and the resistors RE connected between the E1 and E2 pins and ground. The output current is set according to the following equation: IO = VREF/Re (A) VREF voltage operating range: 0 to 1 V E1 pin voltage range: 0 to 1 V Notes on the VREF Pins * Since the VREF pins are the input pins for the reference voltage used to set the current, applications must be designed so that noise that could influence circuit operation does not occur at these pins. Notes on the Ground Pins Since this IC switches large currents, the following notes on ground lines must be observed. * The PCB pattern lines in areas that handle large currents must be as wide as possible so as to have low impedances, and must be kept as far as possible from the small signal systems. * The ground terminals on the sensing resistors Re connected to the E pins (E1 and E2) must be connected as close as possible to the IC GND (pin 21), PGND (pin 22), or DGND (pins 5 and 26) pins as possible. * The capacitors between VCC and ground and between VBB and ground must be as close as possible to the corresponding VCC and VBB pin in the pattern.
No.7947-11/12
LB11948T
Specifications of any and all SANYO Semiconductor 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 Semiconductor 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 Semiconductor 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 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 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 Semiconductor 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 December, 2004. Specifications and information herein are subject to change without notice.
No.7947-12/12

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