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PDF LB1921 Data sheet ( Hoja de datos )
| Número de pieza | LB1921 | |
| Descripción | Three-Phase Brushless Motor Driver for OA Applications | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Ordering number : EN5439
Monolithic Digital IC
LB1921
Three-Phase Brushless Motor Driver
for OA Applications
Overview
The LB1921 is a single-chip motor driver circuit that
provides direct PWM drive output appropriate for driving
the power brushless motors used in office automation
equipment. The LB1921 also provides a variety of
peripheral functions, including speed control and FG
amplifier circuits, on chip.
Applications
• Paper feed and drum motor drivers in FAX and PPC
units
Package Dimensions
unit: mm
3147A-DIP28HS
[LB1921]
Functions and Features
• The LB1921 is an improved output current version of
the LB1824.
• Three-phase bipolar brushless motor driver
• Digital speed control circuit
• Thermal shutdown circuit
• Start/stop pin
• Lock detector output
• Crystal oscillator and divider circuits
• FG and error amplifiers
• Power supply current limiter
SANYO: DIP28HS
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
53096HA (OT) No. 5439-1/10
1 page  
LB1921
Truth Table
Source → Sink
F/R = low
IN1 IN2 IN3
1 OUT3 → OUT2 H H L
2
OUT3 → OUT1
HL
L
3 OUT2 → OUT1 H L H
4 OUT2 → OUT3 L L H
5 OUT1 → OUT3 L H H
6 OUT1 → OUT2 L H L
Note: Input high refers to the state where IN+ > IN–.
R/R = high
IN1 IN2 IN3
LLH
LHH
LH L
HH L
HL L
HL H
The formula below gives the relationship between the oscillator frequency (fOSC) and the FG frequency (fFC).
fFC (servo) = fOSC/(ECL divisor (16) × number of counts)
= fOSC/8192
Crystal Oscillator External Circuit
External Circuit Constants (reference values)
Xtal (MHz)
C1 (pF)
C2 (pF)
R (kΩ)
3 to 4
39
82 0.82
4 to 5
39
82 1.0
5 to 7
39
47 1.5
7 to 10
39
27 2.0
Note: The crystal used must have a fundamental frequency fo impedance to
3fo impedance ratio of 1:5 or greater.
Equivalent Circuit Block Diagram
No. 5439-5/10
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet LB1921.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| LB1920 | Three-Phase Brushless Motor Driver for Office Automation Applications | Sanyo |
| LB1921 | Three-Phase Brushless Motor Driver for OA Applications | Sanyo |
| LB1922 | Three-Phase Brushless Motor Driver for Office Automation Applications | Sanyo |
| LB1924 | Power Brushless Motor Driver IC for Office Automation Equipment | Sanyo |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
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