Ordering number : EN7946A Monolithic Digital IC LB11946 PWM Current Control Stepping Motor Driver Overview The LB11946 is a stepping motor driver 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 support for micro-stepping drive from 1-2 phase excitation drive 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. 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 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 Maximum Ratings at Ta = 25°C Parameter Symbol Motor supply voltage VBB Peak output current IO peak Continuous output current IO max Logic system supply voltage VCC Logic input voltage range VIN Emitter output voltage VE Conditions tw ≤ 20µS Ratings Unit 50 V 1.2 A 1.0 A 7.0 V -0.3 to VCC V VCC = 5V specifications 1.0 V VCC = 3.3V specifications 0.5 V 3.0 W Allowable power dissipation Pd max Operating temperature Topr Independent IC -25 to +85 °C Storage temperature Tstg -55 to +150 °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. 22509 MS 20090212-S00006 / N2206 / 73004TN(OT) No.7946-1/14 LB11946 Recommended Operating Conditions at Ta = 25°C Parameter Symbol Motor supply voltage VBB Logic system supply voltage VCC Reference voltage VREF Conditions Ratings Unit 10 to 45 V VCC = 5V specifications 4.5 to 5.5 V VCC = 3.3V specifications 3.0 to 3.6 V VCC = 5V specifications 0.0 to 3.0 V VCC = 3.3V specifications 0.0 to 1.0 V Electrical Characteristics at Ta = 25°C, VCC = 5V, VBB = 42V, VREF = 1.52V Parameter Symbol Ratings Conditions min typ Unit max Output Block Output stage supply current IBB ON 0.9 1.3 1.7 mA Output saturation voltage VO(sat) 1 IO = +0.5A (sink) 0.7 1.05 mA 1.1 1.4 VO(sat) 2 IO = +1.0A (sink) V 1.4 1.7 V VO(sat) 3 VO(sat) 4 IO = -0.5A (source) 1.9 2.2 V IO = -1.0A (source) 2.2 2.5 Output leakage current IO1 (leak) VO = VBB (sink) V 50 µA IO2 (leak) VO = 0V (source) -50 µA Output sustain voltage VSUS L = 15mH, IO = 1.0A, Design guarantee * 45 V D0 = 1, D1 = 1, D2 = 1, D3 = 1 When these data 24 35 46 mA 22 32 42 mA 0.05 0.1 mA IBB OFF 0.52 Logic Block Logic system supply current ICC ON values are set Input voltage ICC OFF1 D0 = 0, D1 = 0, D2 = 0, D3 = 0 ICC OFF2 ST = LOW VIH 2 V VIL Input current IIH VIH = 2 V IIL VIL = 0.8 V Sense voltages VE D0 = 1, D1 = 1, D2 = 1, D3 = 1 When these data 0.8 V 35 µA µA 6 0.470 0.50 0.525 V D0 = 1, D1 = 1, D2 = 1, D3 = 0 0.445 0.48 0.505 V D0 = 1, D1 = 1, D2 = 0, D3 = 1 0.425 0.46 0.485 V D0 = 1, D1 = 1, D2 = 0, D3 = 0 0.410 0.43 0.465 V D0 = 1, D1 = 0, D2 = 1, D3 = 1 0.385 0.41 0.435 V D0 = 1, D1 = 0, D2 = 1, D3 = 0 0.365 0.39 0.415 V D0 = 1, D1 = 0, D2 = 0, D3 = 1 0.345 0.37 0.385 V D0 = 1, D1 = 0, D2 = 0, D3 = 0 0.325 0.35 0.365 V D0 = 0, D1 = 1, D2 = 1, D3 = 1 0.280 0.30 0.325 V D0 = 0, D1 = 1, D2 = 1, D3 = 0 0.240 0.26 0.285 V D0 = 0, D1 = 1, D2 = 0, D3 = 1 0.195 0.22 0.235 V D0 = 0, D1 = 1, D2 = 0, D3 = 0 0.155 0.17 0.190 V D0 = 0, D1 = 0, D2 = 1, D3 = 1 0.115 0.13 0.145 V D0 = 0, D1 = 0, D2 = 1, D3 = 0 0.075 0.09 0.100 V -1.2 -0.8 values are set Reference current IREF VREF = 1.5V -0.5 CR pin current ICR CR = 1.0V -1.6 MD pin current IMD MD = 1.0V, CR = 4.0V -5.0 µA mA µA Logic system on voltage VLSDON 2.6 2.8 3.0 V Logic system off voltage VLSDOFF 2.45 2.65 2.85 V LVSD hysteresis VLHIS 0.03 0.15 0.35 V Thermal shutdown temperature Ts Design guarantee * 170 °C *Design guarantee: Design guarantee value, Do not measurement. No.7946-2/14 LB11946 AC Electrical Characteristics at VCC = 5V Parameter Symbol Ratings Conditions min typ Unit max Clock frequency Fclk Data setup time TDS 0.9 200 2.5 550 kHz µS Data hold time TDH 0.9 2.5 µS Minimum clock high-level pulse width TSCH 0.9 2.5 µS Minimum clock low-level pulse width TSCL 0.9 2.5 µS SET pin stipulated time Tlat 0.9 2.5 µS SET pin signal pulse width Tlatw 1.9 5.0 µS Fclk TSCH TSCL CLK TSD TDH DATA D4 D5 D6 D10 D11 Tlat SET Tlatw No.7946-3/14 LB11946 Electrical Characteristics at Ta = 25°C, VCC = 3.3V, VBB = 42V, VREF = 1.0V (When measuring the sense voltage: VREF = 1.03V) Parameter Symbol Ratings Conditions min typ Unit max Output Block Output stage supply current Output saturation voltage IBB ON 0.9 1.3 1.7 mA IBB OFF 0.52 0.7 1.05 mA VO(sat) 1 IO = +0.5A (sink) 1.2 1.5 V VO(sat) 2 IO = +1.0A (sink) 1.5 1.8 V VO(sat) 3 IO = -0.5A (source) 2.0 2.3 V 2.3 2.6 V 50 µA VO(sat) 4 IO = -1.0A (source) Output leakage current IO1 (leak) VO = VBB (sink) IO2 (leak) VO = 0V (source) -50 µA Output sustain voltage VSUS L = 15mH IO-1.5A, Design guarantee * 45 V ICC ON D0 = 1, D1 = 1, D2 = 1, D3 = 1 21 Logic Block Logic system supply current 30 39 28 36.5 mA 0.03 0.1 mA When these data values are set Input voltage ICC OFF1 D0 = 0, D1 = 0, D2 = 0, D3 = 0 ICC OFF2 ST = 0.8V VIH 19 2 V VIL Input current Sense voltages mA 0.8 V 35 µA IIH VIH = 2V IIL VIL = 0.8V VE D0 = 1, D1 = 1, D2 = 1, D3 = 1 VREF = 1.03V 0.303 0.330 0.356 V D0 = 1, D1 = 1, D2 = 1, D3 = 0 VREF = 1.03V 0.290 0.315 0.341 V D0 = 1, D1 = 1, D2 = 0, D3 = 1 VREF = 1.03V 0.276 0.300 0.324 V D0 = 1, D1 = 1, D2 = 0, D3 = 0 VREF = 1.03V 0.263 0.286 0.309 V D0 = 1, D1 = 0, D2 = 1, D3 = 1 VREF = 1.03V 0.250 0.272 0.294 V D0 = 1, D1 = 0, D2 = 1, D3 = 0 VREF = 1.03V 0.236 0.257 0.278 V D0 = 1, D1 = 0, D2 = 0, D3 = 1 VREF = 1.03V 0.223 0.243 0.263 V D0 = 1, D1 = 0, D2 = 0, D3 = 0 VREF = 1.03V 0.209 0.228 0.247 V D0 = 0, D1 = 1, D2 = 1, D3 = 1 VREF = 1.03V 0.183 0.200 0.217 V D0 = 0, D1 = 1, D2 = 1, D3 = 0 VREF = 1.03V 0.155 0.170 0.185 V D0 = 0, D1 = 1, D2 = 0, D3 = 1 VREF = 1.03V 0.128 0.143 0.158 V D0 = 0, D1 = 1, D2 = 0, D3 = 0 VREF = 1.03V 0.102 0.114 0.126 V D0 = 0, D1 = 0, D2 = 1, D3 = 1 VREF = 1.03V 0.074 0.085 0.096 V D0 = 0, D1 = 0, D2 = 1, D3 = 0 VREF = 1.03V 0.047 0.057 0.067 Reference current IREF VREF = 1.0V CR pin current ICR CR = 1.0V MD pin current IMD MD = 1.0V, CR = 4.0V LVSD voltage VLSDON Logic system off voltage VLSDOFF LVSD hysteresis VLHIS Thermal shutdown temperature Ts Design guarantee * µA 6 -0.91 V µA -0.5 -0.7 -0.49 2.6 2.8 3.0 V 2.45 2.65 2.85 V 0.03 0.15 0.35 mA µA -5.0 170 V °C *Design guarantee: Design guarantee value, Do not measurement. No.7946-4/14 LB11946 AC Electrical Characteristics at VCC = 3.3V Parameter Symbol Ratings Conditions min typ Unit max Clock frequency Fclk Data setup time TDS 0.9 200 2.5 550 kHz µS Data hold time TDH 0.9 2.5 µS Minimum clock high-level pulse width TSCH 0.9 2.5 µS Minimum clock low-level pulse width TSCL 0.9 2.5 µS SET pin stipulated time Tlat 0.9 2.5 µS SET pin signal pulse width Tlatw 1.9 5.0 µS Fclk TSCH TSCL CLK TSD TDH DATA D4 D5 D6 D10 D11 Tlat SET Tlatw No.7946-5/14 LB11946 Package Dimensions unit : mm (typ) 3147C 15 12.7 11.2 R1.7 0.4 8.4 28 1 14 20.0 4.0 4.0 26.75 (1.81) 1.78 1.0 0.6 SANYO : DIP28H(500mil) Pd max -- Ta Allowable power dissipation, Pd max -- W 3.5 3.0 Independent IC 2.0 2.0 1.56 1.5 1.0 0.5 0 -25 0 25 50 75 85 100 Ambient temperature, Ta -- °C VCC VREF1 NC CR1 MD CLK DATA SET ST NC CR2 NC VREF2 GND Pin Assignment 28 27 26 25 24 23 22 21 20 19 18 17 16 15 1 2 3 4 5 6 7 8 9 10 11 12 13 14 VBB NC E1 D-GNDA NC OUTA OUTA OUTB OUTB NC D-GNDB E2 NC VBB LB11946 Note: The D-GNDA and D-GNDB pins are the anode sides of the lower side diodes No.7946-6/14 LB11946 Timing Chart TSCH CLOCK TSCL DATA D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 SET Serially Transferred Data Definition No. IA4 IA3 IA2 IA1 DE1 PH1 IB4 IB3 IB2 IB1 DE2 PH2 D0 D1 D2 D3 D4 D5 D6 D7 D8 D9 D10 D11 Output mode OUTA OUTA OUTB I/O DEC OUTB ratio MODE 0 1 1 1 1 1 1 1 1 1 1 1 1 H L H L 100% SLOW 1 1 1 1 0 1 1 1 1 1 0 1 1 H L H L 96 SLOW 2 1 1 0 1 1 1 1 1 0 1 1 1 H L H L 91 SLOW 3 1 1 0 0 1 1 1 1 0 0 1 1 H L H L 87 SLOW 4 1 0 1 1 1 1 1 0 1 1 1 1 H L H L 83 SLOW 5 1 0 1 0 1 1 1 0 1 0 1 1 H L H L 78 SLOW 6 1 0 0 1 1 1 1 0 0 1 1 1 H L H L 74 SLOW 7 1 0 0 0 1 1 1 0 0 0 1 1 H L H L 70 SLOW 8 0 1 1 1 1 1 0 1 1 1 1 1 H L H L 61 SLOW 9 0 1 1 0 1 1 0 1 1 0 1 1 H L H L 52 SLOW 10 0 1 0 1 1 1 0 1 0 1 1 1 H L H L 44 SLOW 11 0 1 0 0 1 1 0 1 0 0 1 1 H L H L 35 SLOW 12 0 0 1 1 1 1 0 0 1 1 1 1 H L H L 26 SLOW 13 0 0 1 0 1 1 0 0 1 0 1 1 H L H L 17 SLOW 14 1 1 1 1 0 0 1 1 1 1 0 0 L H L H 100 FAST 15 1 1 1 0 0 0 1 1 1 0 0 0 L H L H 96 FAST 16 1 1 0 1 0 0 1 1 0 1 0 0 L H L H 91 FAST 17 1 1 0 0 0 0 1 1 0 0 0 0 L H L H 87 FAST 18 1 0 1 1 0 0 1 0 1 1 0 0 L H L H 83 FAST 19 1 0 1 0 0 0 1 0 1 0 0 0 L H L H 78 FAST 20 1 0 0 1 0 0 1 0 0 1 0 0 L H L H 74 FAST 21 1 0 0 0 0 0 1 0 0 0 0 0 L H L H 70 FAST 22 0 1 1 1 0 0 0 1 1 1 0 0 L H L H 61 FAST 23 0 1 1 0 0 0 0 1 1 0 0 0 L H L H 52 FAST 24 0 1 0 1 0 0 0 1 0 1 0 0 L H L H 44 FAST 25 0 1 0 0 0 0 0 1 0 0 0 0 L H L H 35 FAST 26 0 0 1 1 0 0 0 0 1 1 0 0 L H L H 26 FAST 27 0 0 1 0 0 0 0 0 1 0 0 0 L H L H 17 FAST 28 0 0 0 0 * * 0 0 0 0 * * OFF OFF OFF OFF 0 - Note *: Either 0 or 1. Note *1: In mixed decay mode, set D4 and D10 to 0 and set the MD pin to a level in the range 1.5 to 4.0V. No.7946-7/14 LB11946 Current Settings Truth Table * Items in parentheses are defined by the serial data. IA4 IA3 IA2 IA1 (D0) (D1) (D2) (D3) 1 1 1 1 11.5/11.5 × VREF/3.04RE = Iout 100 1 1 1 0 11.0/11.5 × VREF/3.04RE = Iout 95.65 1 1 0 1 10.5/11.5 × VREF/3.04RE = Iout 91.30 1 1 0 0 10.0/11.5 × VREF/3.04RE = Iout 86.95 1 0 1 1 9.5/11.5 × VREF/3.04RE = Iout 82.61 1 0 1 0 9.0/11.5 × VREF/3.04RE = Iout 78.26 1 0 0 1 8.5/11.5 × VREF/3.04RE = Iout 73.91 1 0 0 0 8.0/11.5 × VREF/3.04RE = Iout 69.56 0 1 1 1 7.0/11.5 × VREF/3.04RE = Iout 60.87 0 1 1 0 6.0/11.5 × VREF/3.04RE = Iout 52.17 0 1 0 1 5.0/11.5 × VREF/3.04RE = Iout 43.48 0 1 0 0 4.0/11.5 × VREF/3.04RE = Iout 34.78 0 0 1 1 3.0/11.5 × VREF/3.04RE = Iout 26.08 0 0 1 0 2.0/11.5 × Vref/3.04RE = Iout 17.39 Set current Iout Current ratio (%) Note: The current ratios shown are calculated values. Block Diagram OUTA OUTA VBB OUTB OUTB VCC MD ST Control logic circuit Control logic circuit D-GND D-GND Thermal shutdown circuit VREF1 Current selection circuit One-shot multivibrator Blanking time One-shot multivibrator Blanking time Serial-parallel converter VREF Current selection circuit GND CR1 E1 CLK DATA SET E2 CR2 No.7946-8/14 LB11946 0.1µF 1.5V 680pF 30kΩ 680pF 30kΩ 5V 10µF Sample Application Circuit at VCC = 5V 23 22 21 20 VREF1 NC CR1 MD CLK DATA SET ST 19 18 17 15 NC E1 D-GNDA NC OUTA OUTA OUTB OUTB NC D-GNDB E2 NC VBB LB11946 16 GND 24 VREF2 25 NC 26 CR2 27 NC 28 VBB MD voltage setting (1.6 to 3.9V) Fast mode: GND Slow mode: VCC VCC Logic level input 1 2 3 4 5 6 7 8 9 10 11 12 13 14 47µF 42V 1Ω 1Ω M 0.1µF 1..0V 680pF 30kΩ 680pF 30kΩ 3.3V 10µF Sample Application Circuit at VCC = 3.3V 23 22 21 20 VREF1 NC CR1 MD CLK DATA SET ST 19 17 16 15 VBB NC E1 D-GNDA NC OUTA OUTA OUTB OUTB NC D-GNDB E2 NC VBB LB11946 18 GND 24 VREF2 25 NC 26 CR2 27 NC 28 VCC Logic level input 1 2 3 4 5 6 7 8 9 10 11 12 13 14 47µF 42V 1Ω M 1Ω MD voltage setting (1.2 to 2.5V) Fast mode: GND Slow mode: VCC No.7946-9/14 LB11946 SLOW DECAY Current Path The reregenerative current at upper-side transistor switching operates VBB Current path at output ON Regenerative current at upper-side transistor OFF ON OFF I OUTA OUTA SBD SBD ON constant Output OFF VE Sensing voltage comparator Motor current I I = VE/Re VREF Re VREF Internal reference voltage by setting voltage circuit 3.04 Fig.1 FAST DECAY Current Path VBB Current path at output ON ON OFF Current path at Fast DECAY OUTA OUTA SBD SBD ON OFF VE Sensing voltage comparator VREF Re VREF 3.04 Fig.2 No.7946-10/14 LB11946 Switching Time Chart at PWM operation SLOW DECAY (Upper-side Chopping) Serial transmission data (D4, D10) = High MD pin: Low setting E pin Output current tn CR pin OUT pin Switching waveform FAST DECAY Serial transmission data (D4, D10) = Low MD pin: Low setting Spike noise E pin Output current CR pin OUT pin Switching waveform No.7946-11/14 LB11946 MIX DECAY Spike noise tm E pin Output current tn MD pin voltage CR pin t on OUT pin t off Switching waveform MIX DECAY logic setting serial transmission data (D4, D10) = Low MD pin: 1.6V to 3.0V at VCC = 5V specification. 1.2V to 2.5V at VCC = 3.3V specification. t on: Output ON time t off: Output OFF time tm: FAST DECAY time at MIX DECAY mode tn: Noise cancel time The following operation by comparison between CR voltage and MD pin voltage in turning off time. CR voltage > MD pin voltage: both sides chopping CR voltage < MD pin voltage: upper side chopping No.7946-12/14 LB11946 Attached Documents 1. Switching Off Time and Noise Canceller 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. (1) When VCC is 5 V 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 (2) When VCC is 3.3 V Noise canceller time (Tn) Tn ≈ C × R × ln {(1.06 − RI) / (2.66 − RI)}[s] CR pin charge current: 0.7 mA Switching off time (Toff) Toff ≈ −C × R × ln (1.06 / 3.1)[s] CR Pin Internal Circuit Structure VCC line One-shot multivibrator Blanking time circuit CR pin R:30kΩ C:680pF E1 2. Notes on the MD Pin (1) 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 ground. (2) If fast decay mode is set up by setting the D4 and D10 bits in the input serial data to 0, mixed 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: (a) Short the MD pin to ground to select fast decay mode, or (b) Short the MD pin to VCC to select slow decay mode. No.7946-13/14 LB11946 Usage Notes (1) 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. (2) Notes on the ground pins Since this IC switches large currents, care is required with respect to the ground 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 ground terminals of the E1 and E2 pin sense resistors (Re) and the external Schottky barrier diode ground terminals must be located as close as possible to the IC ground. 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. (3) 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 due to the protection diodes at the VCC pins, and this can cause incorrect operation. 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. 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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 February, 2009. Specifications and information herein are subject to change without notice. PS No.7946-14/14