LB1946

Ordering number : EN7115 LB1946 Overview Monolithic Digital IC PWM Current Control Stepping Motor Driver The LB1946 is stepping motor drive IC that implements PWM current control bipolar drive with a fixed off time. This IC features 15-current setting levels using a fixed VREF voltage and supports for microstepping drive from 1-2 phase excitation to 4W1-2 phase excitation drive. This device is optimal for driving stepping motors such as those used for carriage drive and paper feed in printers. Applications • PWM current control stepping motor drivers Features • PWM current control with a fixed off time • Logic input serial-parallel converter (allows 1-2, W1-2, 2W1-2, and 4W1-2 phase excitation drive) • Current attenuation switching function (with slow decay, fast decay, and mixed decay modes) • Built-in upper and lower side output diodes • Simultaneous on state prevention function (through current prevention) • Noise canceller function • Thermal shutdown circuit • Shutoff on low logic system voltage circuit • Low-power mode control pin Specifications Absolute Maximum Ratings at Ta = 25°C Parameter Motor supply voltage Peak output current Maximum continuous output current Logic system supply voltage Logic input voltage range Emitter output voltage Operating temperature Storage temperature Allowable power dissipation (IC internal) Symbol VBB IO PEAK IO max VCC VIN VE Topr Tstg Pd max Ta=25°C, independent IC tw≤20µs Conditions Ratings 50 1.75 1.5 7.0 -0.3 to VCC 1.0 -20 to +85 -55 to +150 3.0 Unit V A A V V V °C °C W 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. 11707 SY IM B8-5416 No.7115-1/16 LB1946 Allowable Operating Ranges at Ta = 25°C Parameter Motor supply voltage Logic supply voltage Reference voltage Symbol VBB VCC VREF Conditions Ratings 10 to 45 4.5 to 5.5 0.0 to 3.0 Unit V V V Electrical Characteristics at Ta = 25°C, VCC = 5V, VBB = 45V, VRES = 1.52V Parameter Output Block Output stage supply current IBB ON IBB OFF Output saturation voltage 1 Output saturation voltage 2 Output saturation voltage 3 Output saturation voltage 4 Output leakage current VOsat1 VOsat2 VOsat3 VOsat4 IO1 (leak) IO2 (leak) Output sustain voltage Logic Block Logic system supply current ICC ON ICC OFF1 ICC OFF2 Input voltage VIH VIL Input current IIH IIL Sense voltages VE VIH=2V VIL=0.8V D0=1,D1=1,D2=1,D3=1 When these data values are set D0=1,D1=1,D2=1,D3=0 D0=1,D1=1,D2=0,D3=1 D0=1,D1=1,D2=0,D3=0 D0=1,D1=0,D2=1,D3=1 D0=1,D1=0,D2=1,D3=0 D0=1,D1=0,D2=0,D3=1 D0=1,D1=0,D2=0,D3=0 D0=0,D1=1,D2=1,D3=1 D0=0,D1=1,D2=1,D3=0 D0=0,D1=1,D2=0,D3=1 D0=0,D1=1,D2=0,D3=0 D0=0,D1=0,D2=1,D3=1 D0=0,D1=0,D2=1,D3=0 Reference current CR pin current MD pin current Logic system on voltage Logic system off voltage LVSD hysteresis Thermal shutdown temperature IREF ICR IMD VLSDON VLSDOFF VLHIS Ts VREF=1.5V CR=1.0V MD=1.0V, CR=4.0V 6 0.470 0.445 0.425 0.410 0.385 0.365 0.345 0.325 0.280 0.240 0.195 0.155 0.115 0.075 -0.5 -1.7 -5.0 2.6 2.45 0.03 2.8 2.65 0.15 170 3.0 2.85 0.35 -1.25 -0.9 0.50 0.48 0.46 0.43 0.41 0.39 0.37 0.35 0.30 0.26 0.22 0.17 0.13 0.09 0.525 0.505 0.485 0.465 0.435 0.415 0.385 0.365 0.325 0.285 0.235 0.190 0.145 0.100 D0=1,D1=1,D2=1,D3=1 When these data values are set D0=0,D1=0,D2=0,D3=0 ST=LOW 25.5 18 0.01 2 0.8 35 37 26 0.05 48.5 34 0.1 mA mA mA V V µA µA V V V V V V V V V V V V V V µA mA µA V V V °C VO sus IO=+1.0A (sink) IO =+1.5 A (sink) IO=-1.0 A (source) IO=-1.5 A (source) VO=VBB (sink) VO=0V (source) L=15mH IO=1.5A * -50 45 1.6 1.3 2.4 1.9 1.2 1.5 1.9 2.2 3.5 2.5 1.6 1.9 2.2 2.4 50 mA mA V V V V µA µA V Symbol Conditions min Ratings typ max unit *Design guaranteed value No.7115-2/16 LB1946 AC Electrical Characteristics at VCC = 5V Parameter Clock frequency Data setup time Data hold time Minimum clock high-level pulse width Minimum clock low-level pulse width SET pin stipulated time SET pin signal pulse width Symbol fclk tDS tDH tSCH tSCL tlat tlatw VCC=5.0V VCC=5.0V VCC=5.0V VCC=5.0V VCC=5.0V VCC=5.0V VCC=5.0V 0.9 0.9 0.9 0.9 0.9 1.9 Conditions min Ratings typ 200 2.5 2.5 2.5 2.5 2.5 5.0 max 550 kHz µs µs µs µs µs µs unit fclk tSCH tSCL CLK tDS tDH DATA D4 D5 D6 D10 D11 tlat SET tlatw VCC=3.3V Specification Absolute Maximum Ratings Parameter Emitter output voltage Symbol VE Conditions Ratings 0.5 Unit V Allowable Operating Ranges at Ta = 25°C Parameter Motor system supply voltage Logic system supply voltage Reference voltage Symbol VBB VCC VREF Conditions Ratings 10 to 45 3.0 to 3.6 0.0 to 1.0 Unit V V V Electrical Characteristics at Ta = 25°C, VCC = 3.3V, VBB = 45V, VREF = 1.0V Parameter Output Block Output stage supply current IBB ON IBB OFF Output saturation voltage 1 Output saturation voltage 2 Output saturation voltage 3 Output saturation voltage 4 Output leakage current VOsat1 VOsat2 VOsat3 VOsat4 IO1 (leak) IO2 (leak) Output sustain voltage VO sus IO=+1.0A (sink) IO=+1.5 A (sink) IO=-1.0 A (source) IO=-1.5 A (source) VO=VBB (sink) VO=0V (source) L=15mH IO=-1.5A * -50 45 1.6 1.3 2.4 1.9 1.3 1.6 1.9 2.2 3.5 2.5 1.7 2.0 2.2 2.4 50 mA mA V V V V µA µA V Symbol Conditions min Ratings typ max unit *Design guaranteed value Continued on next page. No.7115-3/16 LB1946 Continued from preceding page. Parameter Logic Block Logic system supply current ICC ON ICC OFF1 ICC OFF2 Input voltage VIH VIL Input current IIH IIL Sense voltages VE VIH=2V VIL=0.8V D0=1,D1=1,D2=1,D3=1 When these data values are set D0=1,D1=1,D2=1,D3=0 D0=1,D1=1,D2=0,D3=1 D0=1,D1=1,D2=0,D3=0 D0=1,D1=0,D2=1,D3=1 D0=1,D1=0,D2=1,D3=0 D0=1,D1=0,D2=0,D3=1 D0=1,D1=0,D2=0,D3=0 D0=0,D1=1,D2=1,D3=1 D0=0,D1=1,D2=1,D3=0 D0=0,D1=1,D2=0,D3=1 D0=0,D1=1,D2=0,D3=0 D0=0,D1=0,D2=1,D3=1 D0=0,D1=0,D2=1,D3=0 Reference current CR pin current MD pin current Logic system on voltage Logic system off voltage LVSD hysteresis Thermal shutdown temperature IREF ICR IMD VLSDON VLSDOFF VLHIS Ts VREF=1.5V CR=1.0V MD=1.0V, CR=4.0V 6 0.303 0.290 0.276 0.263 0.250 0.236 0.223 0.209 0.183 0.155 0.128 0.102 0.074 0.047 -0.5 -0.91 -5.0 2.6 2.45 0.03 2.8 2.65 0.15 170 3.0 2.85 0.35 -0.7 -0.49 0.330 0.315 0.300 0.286 0.272 0.257 0.243 0.228 0.200 0.170 0.143 0.114 0.085 0.057 0.356 0.341 0.324 0.309 0.294 0.278 0.263 0.247 0.217 0.185 0.158 0.126 0.096 0.067 D0=1,D1=1,D2=1,D3=1 When these data values are set D0=0,D1=0,D2=0,D3=0 ST=0.8V 23.5 16 0.005 2 0.8 35 34 23 0.03 44.5 30 0.1 mA mA mA V V µA µA V V V V V V V V V V V V V V µA mA µA V V V °C Symbol Conditions min Ratings typ max unit AC Electrical Characteristics at VCC = 3.3V Parameter Clock frequency Data setup time Data hold time Minimum clock high-level pulse width Minimum clock low-level pulse width SET pin stipulated time SET pin signal pulse width Symbol fclk tDS tDH tSCH tSCL tlat tlatw VCC=3.3V VCC=3.3V VCC=3.3V VCC=3.3V VCC=3.3V VCC=3.3V VCC=3.3V 0.9 0.9 0.9 0.9 0.9 1.9 Conditions min Ratings typ 200 2.5 2.5 2.5 2.5 2.5 5.0 max 550 kHz µs µs µs µs µs µs unit No.7115-4/16 LB1946 fclk tSCH tSCL CLK tDS tDH DATA D4 D5 D6 D10 D11 tlat SET tlatw Package Dimensions unit:mm (typ) 3147C 28 15 R1.7 12.7 11.2 8.4 1 20.0 26.75 14 (1.81) 1.78 0.6 1.0 SANYO : DIP28H(500mil) 4.0 Pd max - Ta Allowable power dissipation, Pd max - W Independent IC 3.0 2.0 1.0 0 --20 0 20 40 60 4.0 4.0 80 100 ILB01479 Ambient temperature, Ta - °C 0.4 No.7115-5/16 LB1946 Block Diagram VCC ST VREF2 +- Control logic circuit Current selection circuit One-shot multi-vibrator blanking time OUTB- CR2 E2 OUTB SET VBB Thermal shutdown circuit Serial-parallel conversion circuit DATA CLK OUTAE1 OUTA One-shot multi-vibrator blanking time CR1 Control logic circuit Current selection circuit + - MD VREF1 GND No.7115-6/16 LB1946 Pin Assignment VREF1 VREF2 16 13 NC DATA 28 27 26 25 24 23 22 21 20 19 18 17 NC 15 LB1946 1 VBB 2 NC 3 E1 4 NC 5 NC 6 OUTA- 7 OUTA 8 OUTB- 9 OUTB 10 NC 11 NC 12 E2 14 VBB GND VCC CR1 CR2 CLK SET MD NC NC ST Top view Timing Chart 1µs CLOCK 1µs DATA D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 SET No.7115-7/16 LB1946 Serial Transmission Data Definitions No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 IA4 D0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 IA3 D1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 IA2 D2 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 IA1 D3 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 DE1 D4 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 * PH1 D5 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 * IB4 D6 1 1 1 1 1 1 1 1 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 IB3 D7 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 IB2 D8 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 IB1 D9 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 DE2 D10 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 * PH2 D11 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 * OUTA H H H H H H H H H H H H H H L L L L L L L L L L L L L L OFF Output mode OUTAL L L L L L L L L L L L L L H H H H H H H H H H H H H H OFF OUTB H H H H H H H H H H H H H H L L L L L L L L L L L L L L OFF OUTBL L L L L L L L L L L L L L H H H H H H H H H H H H H H OFF I/O ratio 100% 96 91 87 83 78 74 70 61 52 44 35 26 17 100 96 91 87 83 78 74 70 61 52 44 35 26 17 0 DEC MODE SLOW SLOW SLOW SLOW SLOW SLOW SLOW SLOW SLOW SLOW SLOW SLOW SLOW SLOW FAST FAST FAST FAST FAST FAST FAST FAST FAST FAST FAST FAST FAST FAST - Note *: Don't care (0 or 1) Note 1: In the mixed decay mode, set D4 and D10 to 0 and set the MD pin to a level shown below. Programmable MD voltage range VCC=5V specifications: 1.6 to 3.9V VCC=3.3V specifications: 1.2 to 2.5V Current Settings Truth Table * Items in parentheses are defined by the serial data. IA4 (D0) 1 1 1 1 1 1 1 1 0 0 0 0 0 0 IA3 (D1) 1 1 1 1 0 0 0 0 1 1 1 1 0 0 IA2 (D2) 1 1 0 0 1 1 0 0 1 1 0 0 1 1 IA1 (D3) 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Set Current IOUT 11.5/11.5×VREF/3.04RE=IOUT 11.0/11.5×VREF/3.04RE=IOUT 10.5/11.5×VREF/3.04RE=IOUT 10.0/11.5×VREF/3.04RE=IOUT 9.5/11.5×VREF/3.04RE=IOUT 9.0/11.5×VREF/3.04RE=IOUT 8.5/11.5×VREF/3.04RE=IOUT 8.0/11.5×VREF/3.04RE=IOUT 7.0/11.5×VREF/3.04RE=IOUT 6.0/11.5×VREF/3.04RE=IOUT 5.0/11.5×VREF/3.04RE=IOUT 4.0/11.5×VREF/3.04RE=IOUT 3.0/11.5×VREF/3.04RE=IOUT 2.0/11.5×VREF/3.04RE=IOUT Current Ratio (%) 100 95.65 91.30 86.95 82.61 78.26 73.91 69.56 60.87 52.17 43.48 34.78 26.08 17.39 Note 1: The current ratios shown are calculated values. No.7115-8/16 LB1946 Sample Application Circuit at VCC=5V 680pF 30kΩ 680pF 30kΩ 10µ F 5V Logic level inputs MD voltage setting (1.6 to 3.9V) Fast mode: GND Slow mode: VCC 28 VCC 27 VREF1 26 NC 25 CR1 24 MD 23 CLK 22 DATA 21 SET 20 ST 19 NC 18 CR2 17 NC 16 VREF2 13 NC 15 GND 14 VBB LB1946 OUTA OUTB VBB OUTA OUTB NC NC NC NC NC E1 1 2 3 4 5 6 7 8 9 10 11 12 L SBD L SBD SBD SBD 47µ F Top view No.7115-9/16 E2 1.5V 0.1µF 42V 1Ω 1Ω LB1946 Sample Application Circuit at VCC=3.3V 680pF 30kΩ 680pF 10µ F 3.3V Logic level inputs MD voltage setting (1.2 to 2.5V) Fast mode: GND Slow mode: VCC 28 VCC 27 VREF1 26 NC 25 CR1 24 MD 23 CLK 22 DATA 21 SET 20 ST 19 NC 18 CR2 17 NC 16 VREF2 13 NC 15 GND 14 VBB 47µ F Top view No.7115-10/16 42V LB1946 OUTA OUTB OUTA OUTB VBB NC NC NC NC NC E1 1 2 3 4 5 6 7 8 9 10 11 12 L SBD SBD L SBD SBD 1Ω 1Ω E2 1.0V 0.1µF 30kΩ LB1946 Current Path in Slow Decay Mode Regenerative current during upper-side transistor switching operation ON VBB Current path when output is on OFF I Regenerative current when upper-side transistor is off OUTA SBD SBD ON OUTA Constant Output OFF VE VREF Re VREF 3.04 Sense voltage comparator Motor current I I=VE/RE Internal reference voltage generated by setting voltage circuit Figure 1 ILB01480 Current Path in Fast Decay Mode VBB Current path when output is on ON OFF Current path in fast decay mode OUTA SBD SBD OUTA ON OFF Sense voltage comparator VREF Re VREF 3.04 ILB01481 No.7115-11/16 LB1946 Switching Timing Chart During PWM Drive Mode Slow decay (upper-side chopping) Serial transmission data (D4, D10) = High MD pin: Low E pin Output current tn CR pin Output pin Switching Waveform ILB01482 FAST DECAY Serial transmission data (D4, D10) = Low Noise spike MD pin: Low E pin Output current CR pin Output pin Switching Waveform ILB01483 No.7115-12/16 LB1946 MIX DECAY Noise spike tm E pin Output current tn MD pin voltage level CR pin t on Output pin t off Switching Waveform ILB01484 Mix decay logic setting When serial transmission data (D4, D10) is Low MD pin setting: 5V VCC type: 1.6 to 3.9V 3.3V VCC type: 1.2 to 2.5V CR voltage and MD pin voltage are compared to select dual-side chopping or upper-side chopping. CR voltage > MD pin voltage: dual-side chopping CR voltage < MD pin voltage: upper-side chopping t on: Output on time t off: Output off time tm: Fast decay time in mix decay mode tn: Noise cancellation time No.7115-13/16 LB1946 1. Switching OFF time and noise cancellation time calculations Notes on the CR pin setting (switching off time and noise canceller time) The noise canceller time (Tn) and the switching off time (Toff) are set using the following formulas. • When VCC=5V Noise canceller time (Tn) Tn ≈ C R ln {(1.5 - RI)/(4.0 - RI)} [s] CR pin charge current: 1.25mA Switching off time (Toff) Toff ≈ -C R ln (1.5/4.8) [s] Component value ranges R: 5.6kΩ to 100kΩ C: 470pF to 2000pF • When VCC=3.3V Noise canceller time (Tn) Tn ≈ C R ln {(1.06 - RI)/(2.66 - RI)} [s] CR pin charge current: 0.7mA Switching off time (Toff) Toff ≈ -C R ln (1.06/3.1) [s] VCC line One-shot multi-vibrator blanking time circuit CR pin E1 C : 680pF R : 30kΩ Figure 2 CR Pin Internal Circuit Structure No.7115-14/16 LB1946 2. Notes on the MD pin • If slow decay mode is set up by setting the D4 and D10 bits in the input serial data to 1, the MD pin must be shorted to GND. • If the decay mode is set up by setting the D4 and D10 bits in the input serial data to 0, decay mode can be set with the MD pin. When the VCC=5V specifications are used, the setting voltage range for mixed decay mode is 1.6 to 3.9V. When the VCC=3.3V specifications are used, the setting voltage range for mixed decay mode is 1.2 to 2.5V. If mixed decay mode will not be used with the fast decay mode setting, either: Short the MD pin to GND to select fast decay mode, or Short the MD pin to VCC to select slow decay mode. 3. Usage Notes • Notes on the VREF pin Since the VREF pin inputs the reference voltage used to set the current, applications must be designed so that noise does not occur at this pin. • Notes on the GND pins Since this IC switches large currents, care is required with respect to the GND pins. The PCB pattern in sections where large currents flow must be designed with low impedances and must be kept separate from the small-signal system. In particular, the GND terminals of the E pin sense resistor (RE) and external Schottky barrier diode GND terminals must be located as close as possible to the IC GND. The capacitor between VCC and ground and between VBB and GND must be as close as possible to the corresponding VCC and VBB pin in the pattern. • Power on sequence When turning the power systems on VCC→logic level inputs (CLK, DATA, SET, and ST) →VREF→VBB When turning the power systems off VBB→VREF→logic level inputs (CLK, DATA, SET, and ST) →VCC Note that if the power supply for the logic level inputs is on when the VCC power supply is off, a bias with an unstable state will be applied to the protection diodes at the VCC pins, and this can cause incorrect operation. No.7115-15/16 LB1946 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 January, 2007. Specifications and information herein are subject to change without notice. PS No.7115-16/16