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PDF LB1872 Data sheet ( Hoja de datos )
| Número de pieza | LB1872 | |
| Descripción | Polygon Mirror Scanner Driver IC | |
| Fabricantes | Sanyo | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LB1872 (archivo pdf) en la parte inferior de esta página. Total 11 Páginas | ||
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Ordering number : EN5625A
Monolithic Digital IC
LB1872
Polygon Mirror Scanner Driver IC
Overview
The LB1872 is a 3-phase brushless motor driver IC
developed for driving the polygon mirror motor used in
laser printers and similar products.
Functions and Features
• Integrates the circuits (speed control and driver circuits)
required for laser printer polygon mirror motor drive in a
single chip.
• Uses a current linear drive technique for minimal motor
noise. Only a small capacitors are required for output
oscillation prevention.
• PLL speed control adopted for high-precision rotation
with excellent jitter characteristics.
• Phase lock detection output with a chattering prevention
function
• Four rotation rates can be set up using a single crystal
oscillator to support 240, 300, 400, and 600 dpi
operation.
• Arbitrary rotation rates can be acquired when an
external clock is used.
• Deceleration function implemented by short-circuit
braking (free running when stopped)
• Built-in FG and error amplifiers
• Full complement of protection circuits, including
thermal protection, low voltage protection, and current
limiter circuits, provided on chip.
Package Dimensions
unit: mm
3147B-DIP28H
[LB1872]
SANYO: DIP28H
With an arbitrarily large heat sink
Independent IC
Ambient temperature, Ta - °C
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-0005 JAPAN
13098HA(OT) No. 5625-1/11
1 page  
Equivalent Circuit Block Diagram
LB1872
No. 5625-5/11
5 Page 
LB1872
stipulate the speed error when the LD output is on, this must be determined based on the result of a speed
measurement for the motor state.
This IC includes a built-in circuit that masks LD output chattering (rapid switching between on and off) during phase
lock pull-in. The mask time is determined as shown below by the capacitance of the capacitor inserted between the
CLD pin and ground.
t = 0.35 × C
t: Mask time (s)
C: External capacitance (µF)
If LD chattering is masked, the LD output is delayed by the mask time. Therefore care is required, since the speed
error when LD is on is changed by the mask time.
Leave the CLD pin open if there is no need for masking.
7. Power supply stabilization
Since this IC provides large output currents, it can easily cause fluctuations in the power supply line voltage.
Therefore, capacitors with adequate capacitances for stabilization must be inserted between the VDD and ground pins.
If diodes are inserted in the power supply lines to prevent device destruction by reverse power supply connection, the
power supply line voltage becomes especially liable to fluctuations. In this case, even larger capacitors are required.
8. External protection circuits
If an application will include external motor constraint protection and other external protection circuits, use an open
collector transistor output to set the FC pin low to shut off the IC drive current.
s No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace
equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of
which may directly or indirectly cause injury, death or property loss.
s Anyone purchasing any products described or contained herein for an above-mentioned use shall:
Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and
distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all
damages, cost and expenses associated with such use:
Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on
SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees
jointly or severally.
s Information (including circuit diagrams and circuit parameters) herein is for example only; it is not guaranteed for
volume production. 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, 1998. Specifications and information herein are subject to
change without notice.
PS No. 5625-11/11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet LB1872.PDF ] | |
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