LB1847

Ordering number : EN5982A Monolithic Digital IC LB1847 Overview PWM Current Control Type Stepping Motor Driver The LB1847 is a driver IC for stepping motors with PWM current control bipolar drive (fixed OFF time). A special feature of this IC is that VREF voltage is constant while the current can be set in 15 steps, allowing drive of motors ranging from 1-2 phase exciter types to 4W 1-2 phase exciter types. The current decay pattern can also be selected (SLOW DECAY, FAST DECAY, MIX DECAY) to increase the decay of regenerative current at chopping OFF, thereby improving response characteristics. This is especially useful for carriage and paper feed stepping motors in printers and similar applications where high-precision control and low vibrations are required. Features • PWM current control (fixed OFF time) • Load current digital selector (1-2, W1-2, 2W1-2, 4W1-2 phase exciter drive possible) • Selectable current decay pattern (SLOW DECAY, FAST DECAY, MIX DECAY) • Simultaneous ON prevention function (feed-through current prevention) • Noise canceler • Built-in thermal shutdown circuit • Built-in logic low-voltage OFF circuit Specifications Parameter Motor supply voltage Output peek current Absolute Maximum Ratings at Ta = 25°C Symbol VBB IO peak IO max VCC VIN VE Pd max Independent IC With infinitely large heat sink Operating temperature Storage temperature Topr Tstg tW = 20µs Conditions Ratings 50 1.75 1.5 7.0 -0.3 to VCC 1.0 3.0 20 -20 to +85 -55 to +150 Unit V A A A V V W W °C °C Output continuous current Logic supply voltage Logic input voltage range Emitter output voltage Allowable power dissipation 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. http://semicon.sanyo.com/en/network 21809 MS / 11499RM(KI) No.5982-1/15 LB1847 Allowable Operating Ranges at Ta = 25°C Parameter Motor supply voltage range Logic supply voltage Reference voltage range Symbol VBB VCC VREF Conditions Ratings 10 to 45 4.75 to 5.25 0.0 to 3.0 Unit V V V Electrical Characteristics at Ta = 25°C, VBB = 45V, VCC = 5V, VREF = 1.52V Parameter Output Block Output stage supply voltage IBB ON IBB OFF Output saturation voltage VO(sat)1 VO(sat)2 VO(sat)3 VO(sat)4 Output leak current IO(leak)1 IO(leak)2 Output sustain voltage Logic Block Logic supply voltage ICC ON ICC OFF Input voltage VIH VIL Input current IIH IIL Sensing voltage VE VIH = 3.2V VIL = 0.8V I4 = 3.2V, I3 = 3.2V, I2 = 3.2V, I1 = 3.2V I4 = 3.2V, I3 = 3.2V, I2 = 3.2V, I1 = 0.8V I4 = 3.2V, I3 = 3.2V, I2 = 0.8V, I1 = 3.2V I4 = 3.2V, I3 = 3.2V, I2 = 0.8V, I1 = 0.8V I4 = 3.2V, I3 = 0.8V, I2 = 3.2V, I1 = 3.2V I4 = 3.2V, I3 = 0.8V, I2 = 3.2V, I1 = 0.8V I4 = 3.2V, I3 = 0.8V, I2 = 0.8V, I1 = 3.2V I4 = 3.2V, I3 = 0.8V, I2 = 0.8V, I1 = 0.8V I4 = 0.8V, I3 = 3.2V, I2 = 3.2V, I1 = 3.2V I4 = 0.8V, I3 = 3.2V, I2 = 3.2V, I1 = 0.8V I4 = 0.8V, I3 = 3.2V, I2 = 0.8V, I1 = 3.2V I4 = 0.8V, I3 = 3.2V, I2 = 0.8V, I1 = 0.8V I4 = 0.8V, I3 = 0.8V, I2 = 3.2V, I1 = 3.2V I4 = 0.8V, I3 = 0.8V, I2 = 3.2V, I1 = 0.8V Reference current CR pin current MD pin current DECAY pin current Low DECAY pin current High Thermal shutdown temperature Logic ON voltage Logic OFF voltage LVSD hysteresis width IREF ICR IMD IDECL IDECH TSD LVSD1 LVSD2 ∆LVSD 3.35 3.20 0.065 VREF = 1.5V CR = 1.0V MD = 1.0V, CR = 4.0V VDEC = 0.8V VDEC = 3.2V 170 3.65 3.50 0.15 3.95 3.80 0.23 -10 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 -4.6 -5.0 -10 5 -1.0 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 I4 = 3.2V, I3 = 3.2V, I2 = 3.2V, I1 = 3.2V ENABLE = 3.2V 19.5 10.5 3.2 0.8 100 26 15 36.5 19.5 mA mA V V µA µA V V V V V V V V V V V V V V µA mA µA µA µA °C V V V VSUS IO = +1.0A, sink IO = +1.5A, sink IO = -1.0A, source IO = -1.5A, source VO = VBB, sink VO = 0V, source L = 15mH, IO = 1.5A, Guaranteed design value * -50 45 2.3 0.5 3.5 0.8 1.2 1.5 1.9 2.2 5.0 1.1 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 No.5982-2/15 LB1847 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 4.0 25 Pd max -- Ta With infinitely large heat sink Allowable power dissipation, Pd max -- W 20 15 10.4 10 5 3 Independent IC 1.56 0 -20 0 20 0.4 40 60 8085 100 Ambient temperature, Ta -- °C Pin Assignment ENABLE1 ENABLE2 PHASE1 PHASE2 16 13 28 27 26 25 24 23 22 21 20 19 18 17 15 LB1847 1 2 3 4 5 6 7 8 9 10 11 12 14 GND Top view VCC IA1 IA2 IA3 IA4 IB4 IB3 IB2 IB1 OUYA OUYA OUYB OUYB VREF1 DECAY1 DECAY2 VREF2 VBB E1 MD CR1 E2 CR2 No.5982-3/15 Block Diagram OUTA VBB OUTB OUTB OUTA VCC MD PHASE2 Control logic circuit Control logic circuit DECAY2 ENABLE2 IB1 IB2 IB3 IB4 Thermal shutdown circuit Current selector circuit One-shot multiblanking time One-shot multiblanking time Current selector circuit PHASE1 DECAY1 ENABLE1 IA1 IA2 LB1847 IA3 IA4 VREF1 VREF2 GND CR1 E1 E2 CR2 No.5982-4/15 LB1847 Pin Function Pin No. 1 2 13 3 12 4 11 5 10 6 7 8 9 14 15 27 16 26 17 22,23 24,25 21,20 19,18 28 Pin name MD VREF1 VREF2 CR1 CR2 E1 E2 DECAY1 DECAY2 OUTA OUTA OUTB OUTB VBB GND PHASE1 PHASE2 ENABLE1 ENABLE2 IA4,IA3 IA2,IA1 IB4,IB3 IB2,IB1 VCC Logic block supply voltage pin Output set current digital input pin. 15-stage voltage setting. Output ON/OFF setting input pin. Output stage supply voltage pin. Ground pin. Output phase selector input pin SLOW mode/FAST mode selector pin. DECAY2 SLOW DECAY: H FAST DECAY: L Output pin. Pin for controlling the set current with sensing resistor RE. Function Sets the OFF time for FAST mode and SLOW mode in MIX DECAY. Setting input range: 4V to 1.5V. Output set current reference supply pin. Setting voltage range: 0V to 3V. Output OFF time setting pin for switching operation. Truth Table PHASE H L − ENABLE L L H OUTA H L OFF OUTA L H OFF Set Current Truth Table IA4 1 1 1 1 1 1 1 1 0 0 0 0 0 0 IA3 1 1 1 1 0 0 0 0 1 1 1 1 0 0 IA2 1 1 0 0 1 1 0 0 1 1 0 0 1 1 IA1 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 * Current ratio (%) is the calculated set current value. Current Decay Switching Truth Table Current decay mode SLOW DECAY FAST DECAY MIX DECAY DECAY pin H L L MD pin L L 4V to 1.5V input voltage setting Output chopping Upper-side chopping Dual-side chopping CR voltage > MD: dual-side chopping CR voltage < MD: upper-side chopping No.5982-5/15 LB1847 Sequence Table Phase A 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 29 30 31 IA4 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 IA3 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 IA2 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 IA1 ENA1 PHA1 1 1 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 1 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 * 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 Iout 100% 100 100 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 0 17.39 26.08 34.78 43.48 52.17 60.87 69.56 73.91 78.26 82.61 86.95 91.30 95.65 100 100 IB4 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 IB3 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 IB2 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 1 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 Phase B IB1 ENA2 PHA2 0 0 1 0 1 0 1 0 1 0 1 0 1 0 1 1 1 1 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 * 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Iout 0% 17.39 26.08 34.78 43.48 52.17 60.87 69.56 73.91 78.26 82.61 86.95 91.30 95.65 100 100 100 100 100 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 Phase 1-2 Phase W1-2 Phase 2W1-2 Phase 4W1-2 * Don’t care Note: Iout percentage (%) is the calculated setting value. No.5982-6/15 LB1847 Switch Timing Chart During PWM Drive SLOW DECAY (upper-side chopping) DECAY pin: High MD pin: Low E pin Output pin tn RC pin Output pin Switching waveform FAST DECAY DECAY pin: Low MD pin: Low Noise spike E pin Output pin RC pin Output pin Switching waveform No.5982-7/15 LB1847 MIX DECAY Noise spike tm E pin Output pin tn RC pin ton Output pin toff Switching waveform ton toff tm tn : Output ON time : Output OFF time : FAST DECAY time in MIX DECAY mode : Noise cancelling time MIX DECAY logic setting DECAY pin : L MD pin : 1.5V to 4.0V voltage setting 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 No.5982-8/15 LB1847 SLOW DECAY Current Path Regenerative current during upper-side transistor switching operation ON Current path at output ON VBB OFF Regenerative current at upper-side transistor OFF OUTA SBD ON constant SBD OUTA Sensing voltage comparator Re FAST DECAY Current Path VBB ON Current path at output ON OFF Current path at FAST DECAY OUTA ON OFF SBD SBD OUTA Sensing voltage comparator Re No.5982-9/15 LB1847 Composite Spectrum of Set Current (1 step normalized to 90°) Phase B IOUT 16 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 Sequence No. 0 Phase A No. 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 θ θ0 θ1 θ2 θ3 θ4 θ5 θ6 θ7 θ8 θ9 θ10 θ11 θ12 θ13 θ14 θ15 θ16 Rotation angle Composite spectrum 0° 9.87° 14.6° 20.0° 25.5° 30.96° 36.38° 41.63° 45.0° 48.37° 53.62° 59.04° 64.5° 70.0° 75.4° 80.13° 90.0° 100.0 101.5 103.35 101.78 101.12 101.4 102.61 104.7 104.5 104.7 102.61 101.4 101.12 101.78 103.35 101.5 100.0 IOUT * Rotation angle and composite spectrum are calculated values. No.5982-10/15 LB1847 Set Current Waveform Model Phase A 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 IOUT Phase B IOUT PHASE1 PHASE2 No.5982-11/15 LB1847 Sample Application Circuit 10µF 5V Logic input 28 VCC 27 PHASE1 26 ENABLE1 25 IA1 24 IA2 23 IA3 22 IA4 21 IB4 20 IB3 19 IB2 18 IB1 17 ENABLE2 16 PHASE2 VREF2 15 GND LB1847 DECAY1 DECAY2 OUYA OUYA OUYB OUYB VREF1 MD 1 2 3 4 5 6 7 8 9 10 11 12 13 14 1.5V to 4.0V voltage setting SBD L L SBD SBD SBD 42V 47µF 1.5V 15kΩ 470pF 0.51Ω 0.51Ω 15kΩ 470pF Notes on Usage 1. External diodes Because this IC uses upper-side transistor switching in SLOW DECAY mode and dual-side transistor switching in FAST DECAY mode, it requires external diodes between the OUT pins and ground, for the regenerative current during switching OFF. Use Schottky barrier diodes with low VF. 2. VREF pin Because the VREF pin serves for input of the set current reference voltage, precautions against noise must be taken. The input voltage range is 0 to 3.0V. 3. GND pin The ground circuit for this IC must be designed so as to allow for high-current switching. Blocks where high current flows must use low-impedance patterns and must be removed from small-signal lines. Especially the ground connection for the sensing resistor RE at pin E, and the ground connection for the Schottky barrier diodes should be in close proximity to the IC ground. The capacitors between VCC and ground, and VBB and ground should be placed close to the VCC and VBB pins, respectively. VBB CR1 CR2 E1 E2 No.5982-12/15 LB1847 4. Simultaneous ON prevention function This IC incorporates a circuit to prevent feed-through current when phase switching. For reference, the output ON and OFF delay times at PHASE and ENABLE switching are given below. Reference Data * typical value Sink side PHASE switching (Low → Hi) PHASE switching (Hi → Low) ENABLE switching ON delay time OFF deley time ON delay time OFF deley time ON delay time OFF deley time 1.9µs 0.8µs 1.4µs 0.9µs 2.15µs 1.2µs Source side 2.2µs 1.8µs 1.7µs 1.35µs 2.75µs 5.8µs 5. Noise canceler This IC has a noise canceling function to prevent malfunction due to noise spikes generated when switching ON. The noise cancel time tn is determined by internal resistance of the CR pin and the constant of the externally connected CR components. The constant also determines the switching OFF time. Figure 1 shows the internal configuration at the CR pin, and Figure 2 the CR pin constant setting range. Equation when logic voltage VCC = 5V CR pin voltage E1 = VCC × R / (R1 + R2 + R) [V] Noise cancel time tn ≈ (R1 + R2)× C × 1n {(E1 − 1.5) / (E1 − 4.0)} [s] Switching OFF time toff ≈ –R × C × 1n (1.5 / E1) [s] Internal resistance at CR pin : R1 = 1kΩ, R2 = 300Ω (typ.) *The CR constant setting range in Figure 2 on page 15 is given for reference. It applies to a switching OFF time in the range from 8 to 100µs. The switching time can also be made higher than 100 ms. However, a capacitor value of more than several thousand pF will result in longer noise canceling time, which can cause the output current to become higher than the set current. The longer switching OFF time results in higher output current ripple, causing a drop in average current and rotation efficiency. When keeping the switching OFF time within 100 ms, it is recommended to stay within the CR constant range shown in Figure 2. Internal configuration at CR pin VCC line One-shot multi-blanking time circuit R1 R2 CR pin E1 300Ω 1kΩ C:470pF R:15kΩ Figure 1 No.5982-13/15 LB1847 Switching OFF time and CR setting range (toff time : approx. 8 to 100µs) C [pF] 3000 toff time : 30µs 2000 toff time : 50µs toff time : 100µs 1000 50k 100k R [Ω] No.5982-14/15 LB1847 50 ICC -- VCC Output stage supply current, IBB -- mA 5 IBB -- VBB Input logic voltage: IA1,2,3,4 PHA,ENA = VCC typ. Logic supply current, ICC -- mA Input logic voltage: IA1,2,3,4 PHA,ENA = VCC typ. 40 4 Output O N Out 30 p N ut O 3 20 Outp ut O FF 2 Output OFF 1 10 0 0 1 2 3 4 5 6 7 0 0 10 20 30 40 50 60 Logic supply voltage, VCC -- mV 2.8 VO(sat) -- IO Output stage supply current voltage, VBB -- V 2.8 VO(sat) -- IO Output saturation voltage, VO(sat) -- V Output saturation voltage, VO(sat) -- V Sink side [typ.] 2.4 Source side [typ.] 2.4 2.0 2.0 1.6 1.6 1.2 1.2 0.8 0.8 0.4 0.4 0 0 0.4 0.8 1.2 1.6 2.0 2.4 0 0 0.4 0.8 1.2 1.6 2.0 2.4 Output current, IO -- A Output current, IO -- A 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, 2008. Specifications and information herein are subject to change without notice. PS No.5982-15/15