LB1946 Sanyo Semiconductor Corporation, LB1946 Datasheet
LB1946
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LB1946 Summary of contents
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... PWM Current Control Stepping Motor Driver Overview 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 ...
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... IREF CR pin current MD pin current Logic system on voltage VLSDON Logic system off voltage VLSDOFF LVSD hysteresis VLHIS Thermal shutdown temperature *Design guaranteed value LB1946 Symbol Conditions VBB V CC VREF Conditions I O =+1.0A (sink =+1.5 A (sink =-1.0 A (source =-1.5 A (source =VBB (sink =0V (source) L=15mH ...
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... Output saturation voltage sat2 Output saturation voltage sat3 Output saturation voltage sat4 Output leakage current (leak (leak) Output sustain voltage V O sus *Design guaranteed value LB1946 Symbol Conditions f clk V CC =5. =5. =5.0V t SCH V CC =5.0V t SCL ...
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... AC Electrical Characteristics 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 LB1946 Conditions D0=1,D1=1,D2=1,D3=1 When these data values are set D0=0,D1=0,D2=0,D3=0 ST=0. ...
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... CLK DATA D4 SET Package Dimensions unit:mm (typ) 3147C 28 R1.7 1 20.0 26.75 (1.81) 1.78 0.6 1.0 Pd max - Ta 4.0 Independent IC 3.0 2.0 1 Ambient temperature °C LB1946 f clk t SCH t SCL SANYO : DIP28H(500mil 100 ILB01479 D10 D11 t lat t latw No.7115-5/16 ...
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... Block Diagram Control logic circuit OUTB- OUTB VBB OUTA- OUTA Control logic circuit MD LB1946 VREF2 + - Current selection circuit One-shot multi-vibrator blanking time Thermal Serial-parallel shutdown conversion circuit One-shot multi-vibrator blanking time Current selection circuit + - VREF1 CR2 E2 SET DATA circuit CLK ...
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... Pin Assignment Timing Chart 1µs CLOCK 1µ DATA SET LB1946 LB1946 Top view D10 D11 No.7115-7/16 ...
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... Note 1: The current ratios shown are calculated values. LB1946 PH1 IB4 IB3 IB2 IB1 DE2 PH2 D10 D11 ...
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... Sample Application Circuit =5V MD voltage setting (1.6 to 3.9V) Fast mode: GND Slow mode LB1946 Logic level inputs LB1946 SBD SBD SBD SBD Top view No.7115-9/16 ...
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... Sample Application Circuit =3.3V MD voltage setting (1.2 to 2.5V) Fast mode: GND Slow mode LB1946 Logic level inputs LB1946 SBD SBD SBD SBD Top view No.7115-10/16 ...
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... Regenerative current during upper-side transistor switching operation Current path when output is on Regenerative current when upper-side transistor is off ON Constant Motor current I I=VE/RE Current Path in Fast Decay Mode Current path when output is on Current path in fast decay mode LB1946 I OUTA SBD SBD VE VREF Re Figure 1 OUTA SBD ...
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... Slow decay (upper-side chopping) E pin Output current CR pin Output pin FAST DECAY E pin Output current CR pin Output pin LB1946 Serial transmission data (D4, D10) = High tn Switching Waveform Serial transmission data (D4, D10) = Low Noise spike Switching Waveform MD pin: Low ILB01482 MD pin: Low ILB01483 ...
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... 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 LB1946 Noise spike off Switching Waveform MD pin voltage level ILB01484 No ...
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... C: 470pF to 2000pF • When V CC =3.3V Noise canceller time (Tn) Tn ≈ {(1.06 - RI)/(2.66 - RI)} [s] CR pin charge current: 0.7mA Switching off time (Toff) Toff ≈ (1.06/3.1) [s] One-shot multi-vibrator blanking time circuit LB1946 V CC line CR pin E1 Figure 2 CR Pin Internal Circuit Structure No.7115-14/16 ...
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... VBB→VREF→logic level inputs (CLK, DATA, SET, and ST) →V CC Note that if the power supply for the logic level inputs is on when the V CC power supply is off, a bias with an unstable state will be applied to the protection diodes at the V CC pins, and this can cause incorrect operation. LB1946 No.7115-15/16 ...
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... 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. LB1946 PS No.7115-16/16 ...