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PDF LB11873 Data sheet ( Hoja de datos )

Número de pieza LB11873
Descripción Monolithic Digital IC
Fabricantes Sanyo Semicon Device 
Logotipo Sanyo Semicon Device Logotipo



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No Preview Available ! LB11873 Hoja de datos, Descripción, Manual

Ordering number : ENA0081B
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LB11873
Monolithic Digital IC
For Polygonal Mirror Motors
Three-Phase Brushless Motor Driver
Overview
The LB11873 is a 3-phase brushless motor driver developed for driving the polygonal mirror motor used in plain-paper
copiers and similar products. This IC can implement the circuits required for polygonal mirror motor drive (speed control
and driver circuits) in a single chip.
The LB11873 implements low-noise/low-vibration PWM drive by changing the current at phase switching gradually to
reduce motor noise.
Functions
Three-phase bipolar drive (quiet direct PWM)
PLL speed control circuit
Hall sensor FG support
Dedicated external clock
Brake mode switching circuit (free running and reverse braking)
Phase lock detection output (with masking function)
Built-in current limiter, constraint protection, undervoltage protection, thermal protection, and CLK line disconnection
protection circuits
Input pins support 3V system microcontrollers
Specifications
Absolute Maximum Ratings at Ta = 25°C
Parameter
Symbol
Conditions
Supply voltage
Output current
VCC max
IO max
T 500ms
Allowable power dissipation 1
Pd max1
Independent IC
Allowable power dissipation 2
Pd max2
When mounted on a circuit board *1
*1 Specified circuit board : 114.3 × 76.1 × 1.6mm3, glass epoxy.
Ratings
30
1.8
0.9
2.1
Unit
V
A
W
W
Continued on next page.
Any and all SANYO Semiconductor Co.,Ltd. products described or contained herein are, with regard to
"standard application", intended for the use as general electronics equipment (home appliances, AV equipment,
communication device, office equipment, industrial equipment etc.). The products mentioned herein shall not be
intended for use for any "special application" (medical equipment whose purpose is to sustain life, aerospace
instrument, nuclear control device, burning appliances, transportation machine, traffic signal system, safety
equipment etc.) that shall require extremely high level of reliability and can directly threaten human lives in case
of failure or malfunction of the product or may cause harm to human bodies, nor shall they grant any guarantee
thereof. If you should intend to use our products for applications outside the standard applications of our
customer who is considering such use and/or outside the scope of our intended standard applications, please
consult with us prior to the intended use. If there is no consultation or inquiry before the intended use, our
customer shall be solely responsible for the use.
Specifications of any and all SANYO Semiconductor Co.,Ltd. products described or contained herein stipulate
the performance, characteristics, and functions of the described products in the independent state, and are not
guarantees of the performance, characteristics, and functions of the described products as mounted in the
customer's products or equipment. To verify symptoms and states that cannot be evaluated in an independent
device, the customer should always evaluate and test devices mounted in the customer's products or
equipment.
71107 TI PC 20070621-S00004/41807 TI PC B8-9144 No.A0081-1/14

1 page




LB11873 pdf
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Pin Assignment
LB11873
36 35 34 33 32 31 30 29 28
27 26 25 24 23 22 21 20 19
LB11873
123456789
10 11 12 13 14 15 16 17 18
Hall sensor input waveforms and output current waveform
(1) When the Hall sensor input amplitude is small or when the input waveform slope is low
High
IN1
Low
IN2
IN3
IOUT1
IOUT2
Source
Sink
IOUT3
Top view
180° drive: Current flows during all periods; there are on off periods (180° drive)
(2) When the Hall sensor input amplitude is larger or when the input waveform slope is steep
High
IN1
Low
IN2
IN3
IOUT1
IOUT2
Source
Sink
IOUT3
In this case, periods in which drive is off will occur (the off periods vary depending on the Hall sensor inputs).
No.A0081-5/14

5 Page





LB11873 arduino
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Continued from preceding page.
LB11873
Pin No.
Pin
Description
27 VREG Stabilized power supply output (5V output)
Connect a capacitor between this pin and ground
for power supply stabilization.
(About 0.1μF)
Equivalent Circuit
VCC
27
29
3, 30
31, 32
34, 36
VCC
NC
Power supply.
Connect a capacitor (a few tens of μF or larger)
between this pin and ground so that noise does not
enter the IC.
Since this pin is not connected internally to the
chip, it can be used for wiring connections.
FRAME Connect this pin to ground.
LB11873 Overview
1. Speed control circuit
Since the LB11873 adopts PLL speed control, it provides precise, low-jitter, and stable motor operation. This PLL
circuit compares the falling edge of the CLK signal with the FG signal (edges on which the IN1 input changes from low
to high and FGS output rising edges) and controls motor operation based on the difference.
During control operation, the FG servo frequency is the same as the CLK signal frequency.
fFG (servo) = fCLK
2. Output drive circuit
This IC minimizes motor vibration and noise by changing the output current smoothly during phase switching. Since
the change (slope) imposed on the output current during phase switching uses the slope of the Hall sensor input
waveform, the changes in the output waveforms at phase switching will become too steep if the Hall sensor input
waveform slope is steep. This will reduce the noise and vibration reducing effect of this technique. Thus care is
required concerning the slope of the Hall sensor input waveform.
Low side output transistor PWM switching is used for motor speed control and the drive output is adjusted by changing
the duty. The diode between OUT and VM used for the regenerative current when the PWM is off is built into this IC.
Due to the parasitic diode between OUT and ground, if reverse control mode (torque braking) is selected for braking, an
external Schottky barrier diode must be used. Also, if there are problems when the output current is large (for example,
incorrect operation or waveform disruption during low side kickback) a Schottky barrier diode must be connected
between OUT and ground.
Note that if it is necessary to reduce IC thermal dissipation during constant-speed operation, it may be effective to insert
a Schottky barrier diode between OUT and VM. This effect occurs because the regenerative current during PWM
switching will be dissipated in the external diode instead of the IC's internal diode.
3. Current limiter circuit
The current limiter circuit limits the drive current to a current determined by the equation I = VRF/RF, where VRF =
0.5V (typical) and Rf is the current detection resistor. The limiting operation works by reducing other output on duty to
suppress the drive current.
The current limiter circuit detects the reverse recovery current due to PWM operation and, to assure that the current
limiting operation is not performed incorrectly, provides a delay of about 2µs before it operates. Since the changes in
the current levels at startup (the state where there is no counterelectromotive force from the motor) will be rapid if
either the motor coil resistance is low or if the inductance is low, there are cases where current limiter will operates at a
current level above that set due to this delay. In these cases, it will be necessary to take the amount of current increase
due to the delay into account when setting the current limit value.
No.A0081-11/14

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