Ordering number : ENN7947A Monolithic Digital IC LB11948T PWM Constant Current Control 1-2 Phase Excitation Stepping Motor Driver Overview 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 = 25°C Parameter Symbol Conditions Ratings Unit VS supply voltage VS −0.3 to +18 V Logic system supply voltage VCC −0.3 to +18 V 0.5 A tW ≤ 20 µS Peak output current IOpeak Continuous output current IOmax 0.4 A VE 1.0 V Emitter output voltage Input voltage VIN Allowable power dissipation Pdmax −0.3 to VCC V 1.2 W Mounted on the specified PCB* Operating temperature Topg −20 to +85 °C Storage temperature Tstg −40 to +150 °C Note ∗: Specified PCB: 114.3 × 76.1 × 1.6 mm Recommended Operating Conditions at Ta = 25°C Parameter Symbol Conditions Ratings Unit VS supply voltage VS 3.0 to 15 VCC supply voltage VCC 3.0 to 15 V V Reference voltage VREF 0.0 to 0.5 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 = 25°C, VS = VCC = 5 V, VREF = 0.3 V Parameter Ratings Symbol Conditions IVS OFF PH1 = PH2 = 0 V, EN1 = EN2 = 3.0 V ST = 3.0 V IVS ON PH1 = PH2 = EN1 = EN2 = 0 V ST = 3.0 V min typ Unit max [Output Block] VS system supply current 28 5 µA 40 52 mA 1 µA Output saturation voltage 1 VO(sat) 1 IO = +0.2A (source) PH1 = PH2 = EN1 = EN2 = ST = 0 V 0.2 0.4 V Output saturation voltage 2 VO(sat) 2 IO = +0.4A (source) 0.3 0.5 V Output saturation voltage 3 VO(sat) 3 IO = −0.2A (sink) 0.2 0.4 V Output saturation voltage 4 VO(sat) 4 IO = −0.4A (sink) 0.3 0.5 V IO1 (leak) VO = VBB (sink) 50 µA IO2 (leak) VO = 0 V (source) −50 IVS wt Output leakage current µA Upper and lower side output diodes Forward voltage 1 (upper side) VF1 I = 400 mA 0.9 1.1 1.3 V Forward voltage 2 (lower side) VF2 I = 400 mA 0.9 1.1 1.3 V ICC OFF PH1 = PH2 = 0 V, EN1 = EN2 = 3.0 V ST = 3.0 V 6.5 10 13.5 mA ICC ON PH1 = PH2 = EN1 = EN2 = 0 V ST = 3.0 V 7 11 15 mA ICC wt PH1 = PH2 = EN1 = EN2 = ST = 0 V 1 µA [Logic Block] VCC system supply current VI on Input voltage 2.0 V VI off Input current Reference voltage: 1 V Current setting reactive current V 130 µA IIN VIN = 5 V 70 V1V IO = 1 mA 0.95 1 1.05 V −22 −17 −10.5 mA IE Reference current IREF VREF = 0.3 V, VE = 0.3 V −1 CR pin current 1 ICR1 CR = 0.5 V −2 CR pin current 2 ICR2 CR = 3 V Sense voltage 1 VSEN1 Thermal shutdown temperature ∗ 0.8 100 µA µA 1.65 VREF = 0.5 V 0.475 ∗ TS 2.2 2.75 0.5 0.525 mA V °C 170 Note ∗: Design guarantee value Truth Table Channel 1 Input Channel 2 Input Output Input Output ST PHASE1 ENABLE1 OUTA− OUTA PHASE2 ENABLE2 OUTB− H L L H L L L H OUTB L H H L L H H L L H H ∗ H OFF OFF ∗ H OFF OFF L ∗ ∗ OFF OFF ∗ ∗ 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 SANYO : TSSOP-30 (275mil) ! × "# × # $ % Pin Assignment Top view No.7947-3/12 LB11948T Pin Functions Pin No. Symbol Functional descriptions 1 OUT1− Output 2 OUT1 Output 3 NC Unused 4 NC Unused 5 D−GND Lower side internal diode anode connection Constant current control sensing 6 E1 The motor current is set by the value of the sensing resistor Re connected between the E1 pin and ground. 7 VS1 8 NC Unused 9 VCC VCC power supply 10 CR The current is set according to the following equation: IO = VREF/Re (A) 11 VREF1 12 NC 13 ENABLE1 14 PHASE1 VS 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 When PHASE1 = high: Output pin states: OUTA: high, OUTA-: low. When PHASE1 = low: Output pin states: OUTA: low, OUTA-: high. Standby mode setting 15 ST 16 NC 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 µA in this mode. Unused 1 V regulator circuit output 17 1VREG 18 PHASE2 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 When PHASE2 = high: Output pin states: OUTA: high, OUTA-: low. When PHASE2 = low: Output pin states: OUTA: low, OUTA-: high. 19 ENABLE2 20 VREF2 21 GND 22 PGND 23 NC 24 VS2 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 25 E2 The motor current is set by the value of the sensing resistor Re connected between the E2 pin and ground. 26 D−GND 27 NC Unused 28 NC Unused 29 OUT2 Output 30 OUT2− Output The current is set according to the following equation: IO = VREF/Re (A) Lower side internal diode anode connection No.7947-4/12 LB11948T Block Diagram µ * µ * !" + +& #$! ) !"% 1Ω _ + +% #$!% +%& % &' ( *% *' . Ω Ω _ 1Ω + #&' ( #&' ( * *% * ,- Ω -/ No.7947-5/12 LB11948T Sample Application Circuit 1 OUT1- OUT2- 30 2 OUT1 OUT2 29 3 NC NC 28 4 NC NC 27 5 D-GND 6 E1 7 VS1 8 NC 9 VCC M D-GND2 26 1Ω 8V 10 µF 10 µF 5V 56 kΩ 680pF E2 25 LB11948T 1Ω 10 CR 11 VREF1 12 NC VS2 24 NC 23 PGND 22 GND 21 VREF2 20 ENABLE2 19 Logic level input 13 ENABLE1 PHASE2 18 Logic level input 14 PHASE1 15 ST Logic level input 30 kΩ 10 kΩ 1VREG 17 16 90 deg PHASE1 PHASE2 200 Hz No.7947-6/12 LB11948T Drive Sequence Table 2 Phase Excitation Drive Sequence Table 1 Clockwise drive No. PHASE1 ENABLE1 OUT1 OUT1− PHASE2 ENABLE2 OUT2 OUT2− 0 0 0 0 1 0 0 0 1 1 1 0 1 0 0 0 0 1 2 1 0 1 0 1 0 1 0 3 0 0 0 1 1 0 1 0 Table 2 Counterclockwise drive No. PHASE1 ENABLE1 OUT1 OUT1− PHASE2 ENABLE2 OUT2 OUT2− 0 0 0 0 1 1 0 1 0 1 1 0 1 0 1 0 1 0 2 1 0 1 0 0 0 0 1 3 0 0 0 1 0 0 0 1 1-2 Phase Excitation Drive Sequence Table 3 Clockwise drive No. PHASE1 ENABLE1 OUT1 OUT1− PHASE2 ENABLE2 OUT2 OUT2− 0 0 0 0 1 0 1 OFF OFF 1 0 0 0 1 0 0 0 1 2 1 1 OFF OFF 0 0 0 1 3 1 0 1 0 0 0 0 1 4 1 0 1 0 1 1 OFF OFF 5 1 0 1 0 1 0 1 0 6 0 1 OFF OFF 1 0 1 0 7 0 0 0 1 1 0 1 0 Table 4 Counterclockwise drive No. PHASE1 ENABLE1 OUT1 OUT1− PHASE2 ENABLE2 OUT2 OUT2− 0 0 0 0 1 1 1 OFF OFF 1 0 0 0 1 1 0 1 0 2 1 1 OFF OFF 1 0 1 0 3 1 0 1 0 1 0 1 0 4 1 0 1 0 0 1 OFF OFF 5 1 0 1 0 0 0 0 1 6 0 1 OFF OFF 0 0 0 1 7 0 0 0 1 0 0 0 1 No.7947-7/12 LB11948T 2 Phase Excitation Drive Sequence Clockwise drive 0 1 2 3 4 5 6 7 3 4 5 6 7 PHASE1 PHASE2 ENABLE1 ENABLE2 OUT1 OUT1OUT2 OUT2: Output off state Counterclockwise drive 0 1 2 PHASE1 PHASE2 ENABLE1 ENABLE2 OUT1 OUT1OUT2 OUT2: Output off state No.7947-8/12 LB11948T 1-2 Phase Excitation Drive Sequence Clockwise drive 0 1 2 3 4 5 6 7 3 4 5 6 7 PHASE1 PHASE2 ENABLE1 ENABLE2 OUT1 OUT1OUT2 OUT2: Output off state Counterclockwise drive 0 1 2 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⋅ (C⋅R⋅100)/(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