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參數(shù)資料
| 型號： | LB11824 |
| 廠商： | Sanyo Electric Co.,Ltd. |
| 英文描述： | Direct PWM Drive Brushless Motor Predriver for On-Demand Water Heater and Air Conditioner Motors |
| 中文描述： | 直接PWM驅動無刷電機預驅動器的按需熱水器和空調電機 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 178K |
| 代理商： | LB11824 |
LB11824M Function Description
1. Output drive circuit
This IC employs a direct PWM drive method to minimize the power loss at output. The output TR is normally
saturated in the ON condition, adjusting the motor drive power by changing the output on-duty. Output PWM
switching is made on UH, VH, and WH output sides. Since UL - WL and UH- WH outputs are of the same output
form, either lower PWM or upper PWM can be selected by changing the external output Tr connection method.
Selection of diode to be connected to the non-PWM side output requires attention because there is a problem of reverse
recovery time. (Unless a diode with the short reverse recovery time is selected, the through current flows in an instant
when the PWM side Tr is turned ON.)
UL - WL and UH - WH outputs enter the high impedance condition at a time of stop or when the supply voltage is
extremely low (below the allowable operation voltage). Accordingly, an appropriate measure (pull-down resistor, etc.)
is necessary in the external circuit to prevent an incorrect action due to the leak current.
2. Current limiting circuit
The current limiting circuit performs limiting with the current determined from I = V
RF
/Rf (V
RF
= 0.5Vtyp, Rf: current
detector resistance) (that is, this circuit limits the peak current).
Limiting operation includes decrease in the output on-duty to suppress the current.
The current limiting circuit incorporates a filter circuit to prevent
an incorrect action of current limiting operation due to detection
of the reverse recovery current of output diode during PWM
operation. This internal filter circuit will be enough to prevent
trouble for normal application. In case of an incorrect action
(diode reverse recovery current flowing for 1μs or more), add an
external filter circuit (R, C low pass filter, etc.).
3. Power save circuit
This IC enters the power save condition to decrease the current dissipation
in the stop mode. In this condition, the bias current of most of circuits is cut
off. Even in the power save condition, the 5 V regulator output (VREG) is
given. If the bias current of Hall device is to be cut, 5V and Hall device
may be connected via PNP Tr as a means to meet such needs.
4. Compatibility with various power supplies
To operate this IC with external 5V power supply (4.5 - 5.5 V), short-circuit V
CC
1 and V
REG
pin for connection to
power supply.
To operate this IC with external 12 V power supply (8 - 13.5 V), connect power supply to V
CC
1 (5V is generated at the
VREG pin to function as a power supply to the control circuit).
To operate this IC with external 15 V power supply (13.5 - 19 V), connect power supply to V
CC
3 and short-circuit
12REG and V
CC
1 pins (12 V is generated at the 12REG pin to function as a power supply to V
CC
1).
Connect the V
CC
2 pin basically to the V
REG
pin. In an application in which the motor rotation speed is to be
determined by the external fixed voltage (resistor division, etc.), set V
CC
2 to 12 V (by connecting to V
CC
1) to suppress
variation of the output duty. (Variation of IC is difficult to affect adversely because of increase in the PWM oscillation
amplitude and in the comparator dynamic range.)
5. PWM frequency
PWM frequency is determined from the capacity C (F) of capacitor connected to the PWM pin.
fPWM .=1/(45000
×
C)
Connection of a 1000 pF capacitor causes oscillation of about 22 kHz. Excessively low PWM frequency causes causes
a switching sound from the motor while excessively high PWM frequency causes increase in the power loss at the
output. About 15 - 50 kHz is recommended. Capacitor GND should be arranged near the IC GND pin as much as
possible to protect from the effect of output noise.
No. 7107-14/17
LB11824M
Current detection resistance
To pin RF
To pin VREG
To pin S/S
Hall device
相關PDF資料 |
PDF描述 |
|---|---|
| LB11824M | Direct PWM Drive Brushless Motor Predriver for On-Demand Water Heater and Air Conditioner Motors |
| LB11825M | LB11825M |
| LB11826 | LB11826 |
| LB11827 | Three-Phase Brushless Motor Driver for OA Products |
| LB11847 | PWM Current Control Type Stepping Motor Driver |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LB11824M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:Direct PWM Drive Brushless Motor Predriver for On-Demand Water Heater and Air Conditioner Motors |
| LB11825M | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:LB11825M |
| LB11826 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For OA Products Three-Phase Brushless Motor Driver |
| LB11826_08 | 制造商:SANYO 制造商全稱:Sanyo Semicon Device 功能描述:For OA Products Three-Phase Brushless Motor Driver |
| LB11826-E | 功能描述:馬達/運動/點火控制器和驅動器 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 |
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