- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄43902 > LB1921 BRUSHLESS DC MOTOR CONTROLLER, 3.5 A, PDIP28 PDF資料下載
參數(shù)資料
| 型號： | LB1921 |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 3.5 A, PDIP28 |
| 封裝： | HEAT SINK, SDIP-28 |
| 文件頁數(shù)： | 9/11頁 |
| 文件大?。?/td> | 172K |
| 代理商： | LB1921 |
LB1921
No.5439-7/11
AC Test Circuit Diagram
1
28
2
27
3
26
4
25
5
24
6
23
7
22
8
21
9
20
10
19
11
18
12
17
13
16
14
15
C1
0.22
F
VCC(24V)
GND
C2
0.22
F
2.2
F
22
F
C9
C5
R2
240k
R3
R5
7.6k
C8
0.1
F
5600pF
C10
39pF
3.0757
MHz
C11
82pF
R9
240k
R13 680
R14 820
R7
30k
R10
75k
R11
30k
R12
820
R8
1.2M
R1
5.1k
FGS
LD
C3
C7
C4
0.1
F
C6
1500pF
+
SB10
-05
×3
DS135
×3
D1
R4
2k
R6
0.2
R15
180k
D2
D3
D4
D5
D6
SW1 SW2
1500pF
LB1921
This section describes the LB1921 and the external components used.
1. Speed Control Circuit
This IC uses the 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 technique. The PLL
circuit outputs a phase error signal once every FG period, also using a charge pump technique. As compared to
earlier schemes that only used a speed discriminator, the combination of a PLL circuit with a speed discriminator
provides improved speed variation suppression when using a motor with large load variations. Since the following
formula determines the FG servo frequency, the motor speed must be set using the number of FG pulses and the
crystal oscillator frequency.
fFG (servo) = fOSC/8192
fOSC : crystal oscillator frequency
2. Direct PWM Drive
This IC adopts direct PWM drive to minimize power loss in the output. The output transistors are always saturated
when on and the motor drive power is adjusted by changing the output on duty. Since output switching is performed
by the lower side transistor, the three Schottky diodes D1, D2 and D3 must be inserted between OUT and VCC.
(Note that a through current will flow at the instant the lower side transistor turns on if these diodes do not have a
short reverse recovery time.) Normal rectifying diodes can be used for the diodes between OUT and ground.
3. Current Control Circuit
The current control circuit applies current control at a current determined by the relation I = 0.5/Rf, i.e. peak current
limitation. The control operation reduces the output on duty and thus suppresses the current. No phase
compensation capacitor is required.
4. Speed Lock Range
The speed lock range is
±6.25% of the fixed speed and the LD pin goes low when the motor is in the lock range.
(This pin is an open-collector output.) When the motor speed goes out of the lock range, the LB1921 changes the
motor drive output on duty according to the speed error to control the motor speed to be within the lock range.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LB1928 | BRUSHLESS DC MOTOR CONTROLLER, 3.1 A, PDIP28 |
| LB1965M | BRUSHLESS DC MOTOR CONTROLLER, 1.5 A, PDSO14 |
| LB1987D | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDIP28 |
| LB1987M | BRUSHLESS DC MOTOR CONTROLLER, 1.3 A, PDSO36 |
| LB8656W | STEPPER MOTOR CONTROLLER, 0.6 A, PQFP48 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LB1922 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Three-Phase Brushless Motor Driver for Office Automation Applications |
| LB1923M | 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 |
| LB1923M-MPB-E | 制造商:ON Semiconductor 功能描述:3PHASE MOTOR PRE-DRIVER - Trays |
| LB1923M-TLM-E | 功能描述:馬達/運動/點火控制器和驅(qū)動器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:Stepper Motor Controllers / Drivers 類型:2 Phase Stepper Motor Driver 工作電源電壓:8 V to 45 V 電源電流:0.5 mA 工作溫度:- 25 C to + 125 C 安裝風格:SMD/SMT 封裝 / 箱體:HTSSOP-28 封裝:Tube |
| LB1924 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Power Brushless Motor Driver IC for Office Automation Equipment |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。