LB1845 Monolithic Digital Current Controlling Stepping Motor

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LB1845 Monolithic Digital Current Controlling Stepping Motor

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Ordering number EN5505D
LB1845
Monolithic Digital
Current Controlling Stepping Motor Driver
LB1845 current control type stepping motor driver that uses bipolar drive scheme. particularly suitable driving carriage paper feed stepping motors printers similar products.
Features
current control (fixed time scheme) Digital load current selection function Sustained output voltage: Built-in thermal shutdown circuit
Specifications
Absolute Maximum Ratings 25°C
Parameter Motor supply voltage Peak output current Continuous output current Logic block supply voltage Logic input voltage range Emitter output voltage Allowable power dissipation Symbol peak max1 max2 Operating temperature Storage temperature Topr Tstg Independent With arbitrarily large heat sink 20µs Conditions Ratings 1.75 -0.3 20.0 +150 Unit
SANYO Semiconductor products described contained herein have specifications that handle applications that require extremely high levels reliability, such life-support systems, aircraft's control systems, other applications whose failure reasonably expected result serious physical and/or material damage. Consult with your SANYO Semiconductor representative nearest before usingany SANYO Semiconductor products described contained herein such applications. SANYO Semiconductor assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications SANYO Semiconductor products described contained herein.
O1806 D3096HA (OT) No.5505-1/9
LB1845
Recommended Operating Ranges 25°C
Parameter Motor supply voltage Logic block supply voltage Reference voltage Symbol VREF Conditions Ratings 44.5 4.75 5.25 Unit
Electrical Characteristics 25°C, 38V, VREF
Parameter [Output Block] Output stage supply current Output saturation voltage VO(sat)1 VO(sat)2 VO(sat)3 VO(sat)4 Output leakage current IO(leak)1 IO(leak)2 Sustained output voltage [Logic Block] Logic supply current Input voltage Input current Current control threshold voltage VREF/VSENSE 2.4V 0.8V 0.8V, 0.8V 2.4V, 0.8V 0.8V, 2.4V Thermal shutdown temperature 13.5 25.5 10.5 16.5 34.5 0.8V, 0.8V 2.4V, 2.4V 19.5 15.5 25.3 20.1 V(sus) +1.0A Sink +1.5A Sink -1.0A Source -1.5A Source Sink Source Symbol Conditions Ratings unit
Note: Design guaranteed value.
Package Dimensions
unit: (typ) 3147C
R1.7
12.7 11.2
20.0 26.75
(1.81)
1.78
SANYO DIP28H(500mil)
No.5505-2/9
LB1845
With arbitrarily large heat sink
Allowable Power Dissipation,
10.4
Independent
1.56
ILB00880
Ambient Temperature,
Truth Table
ENABLE PHASE OUTA OUTB
Output Current IOUT
Note: Outputs when ENABLE high high state.
Assignment
ENABLE1 ENABLE2 PHASE1 PHASE2 VREF1 VREF2
LB1845
SENSE1
SENSE2
D-GND
D-GND
ILB00881
No.5505-3/9
LB1845
Block Diagram
Output block
Output block
Thermal shutdown
Output block
Output block
Output block
PHASE1 VREF1
Output block
Output block
Output block
PHASE2 VREF2
Current control block
ENABLE1
SHOT
SHOT
Current control block
ENABLE2
SENSE1
0.82(1W) 330pF 470pF
0.82(1W) 470pF 330pF
SENSE2
D-GND
Application Circuit Diagram
100µF SENSE1 VREF1
ILB00882
Motor
OUT1B OUT1A OUT2B
ENABLE1
D-GND SENSE2
ENABLE2 PHASE2 VREF2
PWM2
Digital control signals
OUT2A
Digital control signals
time setting values toffCtRt
PWM1
D-GND
PHASE1
ILB00883
Re=0.82(1W) VREF=5V Rt=56k Ct=470pF Rc=1k Cc=330pF Cbb=100µF
No.5505-4/9
LB1845
Description
SENSE1 SENSE2 D-GND OUT1B OUT1A OUT2B OUT2A VREF1 VREF2 PHASE1 PHASE2 ENABLE1 ENABLE2 I01, I02, Ground Used output time switched output signal. fixed times capacitors resistors connected these pins. toff Output current settings output current determined voltage range 7.5V) input these pins. Output phase switching inputs. High-level input: OUTA high, OUTB Low-level input: OUTA low, OUTB high Output on/off settings High-level input: output Low-level input: output Digital inputs that output current output currents 1/3, 2/3, full setting these pins appropriate combinations high levels. Logic block power supply Internal diode anode connection Outputs Output stage power-supply voltage current detection pins. Connect these pins, back through noise filters, current controlled resistors inserted between these pins ground. Function
Timing chart switching operations during drive
Spike noise
SENSE
VOUT
toff
ILB00884
Figure Switching Waveforms toff: Output time. Determined external capacitor resistor (toff Delay time between point current sensed SENSE point output turns off.
No.5505-5/9
LB1845
Usage Notes
External diode Since this adopts system based lower side transistor switching drive, external diode regenerative current that occurs during switching required between VOUT. Schottky barrier diode with feedthrough current. Noise filters Since spike noise (see Figure occurs when switching state external diode's feedthrough current, applications must remove noise from SENSE with noise filter (Cc, between SENSE pin. However, note that values large, SENSE voltage rise will slowed, current setting will shifted towards higher current level. VREF possible change output current continuously continuously changing VREF voltage. However, this voltage cannot VREF input impedance (±30%) when VREF Since this used output current, applications must designed that noise does appear this pin's input. Since this switches large currents, care must taken avoid ground loops when mounted application. section that handles large currents should designed with low-impedance pattern, must separated from small signal sections circuit. particular, ground sense resistor must close possible ground. Operation hold mode There cases where current somewhat larger than current setting flow hold mode (light load mode). Since this adopts lower side switching, lower side sense system, emitter voltage falls sense voltage goes when switching state goes off. circuit then always turns output after toff period elapsed. this time, light load, existence time fact that output goes even output current higher than current, output current will somewhat higher than current. Applications should current setting somewhat lower than required this occurs. Function preventing upper lower outputs being same time This incorporates built-in circuit that prevents through currents that occur when phase switched. table lists output delay times when PHASE EANBLE switched.
Sink side When PHASE switched delay time delay time delay time delay time 10µs 1.5µs 1.5µs Source side 6.5µs
When ENABLE
phase excitation double phase excitation control sequence reduce vibration that occurs when motor turns, this supports phase excitation double phase excitation using output current setting digital input pins without changing VREF voltage. Tables list that control sequence, Figure Figure present composite vector diagram this sequence.2. Noise filters
No.5505-6/9
LB1845
Table [1-2 phase excitation] Step
ENABLE1 ENABLE2
Phase Current Value Phase Current Value
Table [Double phase excitation] about Step
ENABLE1 ENABLE2
Phase Current Value Phase Current Value
Composite Vector Diagram
[1-2 phase excitation]
Phase
[Double phase excitation]
Phase
ILB00885
Phase
ILB00886
Phase
Figure Composite Vector Diagram Sequence Table (1/4 cycle)
Figure Composite Vector Diagram Sequence Table (1/4 cycle)
No.5505-7/9
LB1845
Logic Block Supply Current,
Output Stage Supply Current,
Outp
Output
Output Stage Power-Supply Voltage,
ILB00887
ICC,
Logic Block Supply Voltage,
ILB00888
VO(sat) IOUT
Output Stage Supply Current,
Logic Block Supply Current,
Output Saturation Voltage, VO(sat)
VBB=38V VREF=5V Output
(Sink side)
VBB=45V VCC=5V VREF=5V
ILB00890
Logic Block Supply Voltage,
ILB00889
VO(sat) IOUT
Output Current, IOUT
(Source side)
Output Saturation Voltage, VO(sat)
VBB=45V VCC=5V VREF=5V
ILB00891
Output Current, IOUT
No.5505-8/9
Output Stage Supply Current,
VCC=5V VREF=5V
ICC,
VBB=38V VREF=5V Output
LB1845
Specifications SANYO Semiconductor products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer's products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer's products equipment. SANYO Semiconductor Co., Ltd. strives supply high-quality high-reliability products. However, semiconductor products fail with some probability. possible that these probabilistic failures could give rise accidents events that could endanger human lives, that could give rise smoke fire, that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO Semiconductor products (including technical data,services) described contained herein controlled under applicable local export control laws regulations, such products must exported without obtaining export license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written permission SANYO Semiconductor Co., Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO Semiconductor product that intend use. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO Semiconductor believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties.
This catalog provides information October, 2006. Specifications information herein subject change without notice.
No.5505-9/9

LB1845 Monolithic Digital Current Controlling Stepping Motor

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