- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄358747 > LB1823M (Sanyo Electric Co.,Ltd.) Power Brushless Motor Predriver IC for OA Applications PDF資料下載
參數(shù)資料
| 型號(hào)： | LB1823M |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Power Brushless Motor Predriver IC for OA Applications |
| 中文描述： | 功率無刷電機(jī)預(yù)驅(qū)動(dòng)器集成電路的辦公自動(dòng)化應(yīng)用 |
| 文件頁數(shù)： | 7/11頁 |
| 文件大小： | 119K |
| 代理商： | LB1823M |
External Component Functions
Notes on LB1823M Operation and External Components
1. Speed control circuit
The LB1823M uses a speed discriminator circuit and a PLL circuit in combination for speed control. The speed
discriminator generates an error output once every two FG periods using a charge pump technique. The PLL circuit
generates a phase error output once every FG period, also using a charge pump technique. By using a speed
discriminator circuit and a PLL circuit together, the LB1823M can suppress speed variations better than earlier
systems that only used a speed discriminator for speed control when used with motors faced with large load
variations. Since the following formula determines the FG servo frequency, the motor speed is set by the number of
FG pulses and the crystal oscillator frequency.
f
FG
(servo) = f
OSC
/8192
f
OSC
: Crystal oscillator frequency
2. Direct PWM drive
This IC adopts a direct PWM drive technique to minimize power loss in the outputs. The output transistors are
always saturated when on, and the motor drive power is adjusted by changing the duty with which the outputs are on.
Since the upper side transistors switch the outputs, Schottky, fast recovery, or similar diodes must be inserted
between OUT and ground (diodes D1, D2 and D3). (This is because through currents will flow in the upper side
transistors at the instant they turn on if these diodes do not have a short reverse recovery time.) Ordinary rectifying
diodes can be used between OUT and V
CC
. Transistors with no parasitic diodes must be used for the output lower
side transistors. If these transistors include parasitic diodes, through currents will flow due to their reverse recovery
time, even if Schottky diodes are used for D1, D2 and D3.
3. Current limiter circuit
The current limiter circuit operates (to limit the peak current) at a current determined by the formula I = 0.5/R
f
(where R
f
= R10). The limiting operation suppresses the current by reducing the on-duty. No phase compensation
capacitor is required.
No. 4696-7/11
LB1823M
Part
Function
Description
C1
Power supply stabilization
Choose a value such that the voltage fluctuations due to the motor drive currents are
stabilized.
C2
IC power supply stabilization
Attach as close as possible to pins 17 and 24.
Use a resistor of 30 k
or larger for R1.
See the figure on page 6.
R1, C3
PWM frequency setting
C4, C5, R2
External crystal oscillator circuit
C6, C7, R3, R4, R5
Servo constants
IC internal power supply
stabilization
Reset pulse generation
If the capacitance of this capacitor is too small, it will become harder to reset the internal IC
logic reliably and incorrect logic operation may occur. Attach as close as possible to pins 11
and 24.
C8
C9, C10, R7, R8
FG amplifier gain and frequency
characteristics settings
R10
Limit current setting
Output current I
OUT
= V
RF
/R10
R11, R12
Hall element bias current settings
R13, R14, R15
Sink current settings
These resistors set the sink currents for the UL, VL and WL (open collector) outputs.
R16
Shunt regulator bias current
settings
Select a value such that a current of over 1 mA flows in the V
M
voltage range for which
guaranteed correct operation is desired.
R17, R18, R19
Pull-down resistors
These resistors speed up the motor drive output transistor off times.
R20
Start time assurance
Include R20 in applications in which the start up time is a problem.
D1, D2, D3
Regeneration current absorption
Use Schottky diodes for D1, D2 and D3.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LB1823 | Power Brushless Motor Predriver IC for OA Applications |
| LB1824 | Power Brushless Motor Driver for OA Equipment |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1824 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Driver for OA Equipment |
| 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。