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參數(shù)資料
| 型號(hào)： | LB1824 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Power Brushless Motor Driver for OA Equipment |
| 中文描述： | 功率無(wú)刷電機(jī)驅(qū)動(dòng)的辦公自動(dòng)化設(shè)備 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 134K |
| 代理商： | LB1824 |
LB1824
LB1824 Functional Description (including external components)
1.Speed control circuit
The LB1824 uses a combination of a speed discriminator circuit and a PLL circuit for speed control. The speed
discriminator circuit outputs an error signal once every two FG periods using a charge pump method. The PLL circuit
outputs a phase error signal once every FG period also using a charge pump method. As compared with earlier speed
control methods that used only a speed discriminator circuit, the combination of both a PLL circuit as well as a speed
discriminator circuit employed in the LB1824 results in improved suppression of speed variations in cases where
motors with large load variations are used. Since the FG servo frequency determined as shown in the formula below,
the motor speed is set by the FG pulse count and the crystal oscillator frequency.
f
FG
(servo) = f
OSC
/8192
f
OSC
= crystal oscillator frequency
2.Direct PWM drive
The LB1824 adopts a direct PWM drive method in order to reduce the power loss at the output. The output transistor is
always saturated when on, and it adjusts the motor drive power by varying the duty that the output is on. Since the
output switching is performed by the lower side transistor, Schottky diodes (D1, D2 and D3) must be attached between
OUT and V
CC
. (This is because if diodes with a short reverse recovery time are not used, through current will flow at
the instant that the lower side transistor turns on.) Normal forward current diodes can be used for the diodes between
OUT and GND.
3.Current control circuit
The current control circuit performs its control operation with a current determined by I = 0.5/R
f
. (This limits the peak
current.) The control operation functions to reduce the on duty and thus suppress the current. No phase compensation
capacitor is required.
4. Speed locking range
The speed locking range is within ±6.25% of the set speed, and when the motor speed enters the locking range the
LD pin goes low (open collector output). When the motor speed is outside the locking range, the motor drive output
on duty is changed according to the speed error, thus implementing the control required to return the motor speed to
within the locking range.
5. PWM frequency
The PWM frequency is determined by the resistor R3 and the capacitor C6 that are attached to the CR pin.
When R3 is connected to the 4 V fixed voltage power supply:
f
PWM
≈
1/(1.2
×
C
×
R)
When R3 is connected to the 7 V fixed voltage power supply:
f
PWM
≈
1/(0.5
×
C
×
R)
Do not use a resistor of less than 30 k
for R3. A PWM frequency of about 15 kHz is desirable. If the PWM
frequency is too low, the motor could oscillate at the PWM frequency during motor constraint and become noisy
since the oscillation will be in the audible frequency range. On the other hand, if the PWM frequency is too high, the
output transistor switching time loss will increase.
6. Ground leading
GND1 (pin 22):
GND2 (pin 11):
ground for blocks other than the output block
output block ground
Connect D4, D5 and D6 to GND2. All other external components should be connected to GND1. The GND1 and
GND2 leads should be grounded at a single point at the connector. Since GND2 carries a large current, its lead
should be as short as possible.
No. 4264-6/9
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LB1825 | Three-Phase Brushless Motor Driver |
| LB1830 | Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1830M | Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1831M | Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1832V | Low-Saturation 1.5-Channel 3 V Drive Bidirectional Driver |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1825 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Three-Phase Brushless Motor Driver |
| LB1830 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Low-Saturation Bidirectional Motor Driver for Low-Voltage Applications |
| LB1830M | 制造商:Panasonic Industrial Company 功能描述:IC |
| LB1830M_11 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Low-Voltage, Low-Saturation Bidirectional Motor Driver |
| LB1830MC | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Bidirectional Motor Driver |
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