LB1847 Sanyo Semiconductor Corporation, LB1847 Datasheet
LB1847
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LB1847 Summary of contents
Page 1
... Ordering number : EN5982 Overview 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 V 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 ...
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... Logic input voltage range Emitter output voltage Allowable power dissipation Operating temperature range Storage temperature range Allowable Operating Ranges Parameter Motor supply voltage range Logic supply voltage range Reference voltage range 25 With an arbitrary large heat sink –20 LB1847 Symbol Conditions OPEAK W I max ...
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... Input current Sensing voltage Reference current CR pin current MD pin current DECAY pin current Low I DECAY pin current High I Thermal shutdown temperature Logic ON voltage L Logic OFF voltage L L hysteresis width VSD LB1847 = 45V 5V REF Conditions (sat)1 I =+1.0A, sink O (sat)2 I =+1.5A, sink O (sat)3 I =– ...
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... 2.0/11 Current ratio (%) is the calculated set current value. Current decay switching truth table Current decay mode DECAY pin SLOW DECAY H FAST DECAY L L MIX DECAY LB1847 OUT OFF OFF Set current Iout /3.04RE=Iout REF /3.04RE=Iout REF /3.04RE=Iout REF /3.04RE=Iout REF /3 ...
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... PHASE1 Output phase selector input pin 16 PHASE2 26 ENABLE1 Output ON/OFF setting input pin 17 ENABLE2 22 24, 25 Output set current digital input pin 21, 20 15-stage voltage setting 19 Logic block supply voltage pin V CC Pin Assignment LB1847 Function description LB1847 A11312 Top view No. 5982-5/16 ...
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... Block diagram LB1847 No. 5982-6/16 ...
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... Iout percentage (%) is the calculated setting value. LB1847 Phase B Phase 1-2 IB4 IB3 IB2 IB1 ENA1 PHA1 Iout 17. 26. 34. 43. 52. 60. 69. 73. 78. 82. 86. 91. 96. 100 100 100 100 100 95. 91. 86. ...
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... Switch timing chart during PWM drive SLOW DECAY(top-side chopping) DECAY pin : High MD pin : Low E pin Output pin RC pin Output oin FAST DECAY DECAY pin : High MD pin : Low E pin Output pin RC pin Output pin LB1847 tn Switching waveform Noise spike Switching waveform A11313 A11314 No. 5982-8/16 ...
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... 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 top-side chopping. CR voltage > MD pin voltage: dual-side chopping CR voltage < MD pin voltage: top-side choppi LB1847 Noise spike tm ton toff Switching waveform A11315 ...
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... SLOW DECAY current path Regenerative current during top-side transistor switching operation Current path at output ON Regenerative circuit when top-side transistor is OFF Current path in FAST DECAY mode Current path at output ON Current path in FAST DECAY mode LB1847 OUTA SBD SBD ON Constant Re OUTA SBD SBD ...
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... Composite spectrum 30. 36. 41. 45 48. 53. 59 80. 90.0 16 LB1847 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 * Rotation angle and composite spectrum are calculated values. 100 Sequence No OUT Phase A A11318 No. 5982-11/16 ...
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... Set current waveform model LB1847 Phase A Phase B I OUT PHASE1 PHASE2 I OUT A11319 No. 5982-12/16 ...
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... 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 V and ground, and V CC LB1847 Logic input LB1847 SBD SBD SBD SBD ...
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... 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 recommended to stay within the CR constant range shown in Figure 2. Internal configuration at CR pin One-shot multi-blanking time circuit LB1847 Source side 2.2 s 1 ...
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... Switching OFF time and CR setting range (t time : approx 100 s) off C [pF] 3000 2000 1000 LB1847 toff time : 30 s toff time : 50 s 50k Figure 2 toff time : 100 s 100k A11322 No. 5982-15/16 ...
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... SANYO 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, 1999. Specifications and information herein are subject to change without notice. LB1847 5 Input logic voltage: I PHA,ENA=V CC typ. ...