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參數(shù)資料
| 型號： | LB1821 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Power Brushless Motor Pre-Driver IC for OA Equipment |
| 中文描述： | 功率無刷電機(jī)預(yù)驅(qū)動IC OA設(shè)備 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大小： | 223K |
| 代理商： | LB1821 |
Output system ground ... Ground for R
f
and the output diodes
Signal system ground ... Ground for the IC and the IC external components
15. V
REG
Pin
If a motor drive system is formed from a single power supply, the V
REG
pin (pin 33) can be used to create the power-
supply voltage (about 6.3 V) for this IC. The V
REG
pin is a shunt regulator and generates a voltage of about 7 volts by
passing a current through an external resistor. A stable voltage can be generated by setting the current to value in the
range 1 to 7 mA. The external transistors must have current capacities of at least 80 mA (to cover the I
CC
+ Hall bias
current + output current <source> requirements) and they must have voltage handling capacities in excess of the
motor power-supply voltage. Since the heat generated by these transistor may be a problem, heat sinks may be
required depending on the packages used. If the IC power-supply voltage (4.4 to 7.0 V) is provided from an external
circuit, apply that voltage directly to the V
CC
pin(pin 32). In that case, the V
REG
pin must either be left open or
connected to ground.
16. FG Amplifier
Normally, the FG amplifier is used to construct a filter amplifier such as that shown in the application circuit to reject
noise. Since a Schmitt comparator is connected after the FG amplifier, applications must set the amplification so that
the amplifier output amplitude is at least 250 mV p-p. (However, a setting that results in an amplitude of 1 to 3 V p-p
during steady-state rotation is desirable.) The capacitor connected between the FG
IN
+ pin (pin 15) and ground is
required for bias voltage stabilization and to generate the initial reset pulse for the internal logic. The reset pulse is
generated in the time it takes for the FG
IN
+ pin to go from 0 to about 1.3 V.
17. Integrating Amplifier
The integrating amplifier integrates the speed error pulses and the phase error pulses and converts them to a speed
command voltage. At the same time it also sets the control loop gain and frequency characteristics using external
components. The integrating amplifier output (pin 1) is normally connected to the TOC pin (pin 44) by an external
line. Separating the integrating amplifier output and the PWM control circuit allows applications to switch the
integrating amplifier constants using an external operational amplifier, analog switch, or other circuit. This is useful
in applications that require integration constant switching due to a wide range of variability in the motor speeds that
must be provided.
18. VCO Filter Amplifier
The VCO filter amplifier converts the VCO system PLL output to the VCO voltage. The amplifier input resistor
(about 10 k
) is built in. Therefore, the gain and the frequency characteristics are set by the feedback resistor and the
feedback capacitor. Since the range of frequency variation supported becomes narrower as the gain is reduced, it is
desirable to set the gain of this amplifier to be 1 or higher.
19. Startup Techniques
If the motor is started and stopped repeatedly over a short period, the charge accumulated on the integrating
amplifier’s external capacitor may become a problem. (This can result in abnormal speed overshooting at startup and
other problems.) The circuit shown below can be effective at resolving this problem.
No. 5686-10/16
LB1821M
Added circuit
S/S signal
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LB1821M | Power Brushless Motor Pre-Driver IC for OA Equipment |
| LB1822 | 3-phase Brushless Motor Predriver with Digital Speed Control |
| LB1823M | Power Brushless Motor Predriver IC for OA Applications |
| LB1823 | Power Brushless Motor Predriver IC for OA Applications |
| LB1824 | Power Brushless Motor Driver for OA Equipment |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1821M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Pre-Driver IC for OA Equipment |
| LB1822 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:3-phase Brushless Motor Predriver with Digital Speed Control |
| LB1823 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Predriver IC for OA Applications |
| LB1823-F-E | 制造商:Sony Semiconductor Solutions Division 功能描述: |
| LB1823M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Predriver IC for OA Applications |
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