- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383946 > THMC41SOPD (Texas Instruments, Inc.) VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS PDF資料下載
參數(shù)資料
| 型號： | THMC41SOPD |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
| 中文描述： | 變速12伏直流無刷風扇電機驅動器 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 238K |
| 代理商： | THMC41SOPD |
THMC40, THMC41
VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS
SLIS097 – MARCH 2000
8
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
high-side PWM output driver (V
OUT
)
Referring to Figure 3, V
OUT
is a drive output to provide PWM controlled power to the common node of the motor
phase windings using an internally generated PWM signal. The PWM duty cycle controls the effective drive
power to the motor, and thus motor speed. The high-side V
OUT
DMOS output transistor has a typical R
DS(ON)
of 400 m
at 25
°
C and a 1-A continuous current.
PWM
CP
COSC
Charge Pump,
HS Gate Drive,
Synchronous
Rectification,
and
Global Thermal
Shutdown
Triangle Wave
Generator
0.5 V to 2.3 V
PUC
Synchronous
Low-Side
Switch
High-Side
Driver
0.1
μ
F
VPWR
VOUT
VPWM
2200 pF
COMP
Figure 3. High-Side PWM Drive
The frequency of the PWM drive (typically 23 kHz) is such that the L/R time constant of the motor phase winding
filters the current. Referring to Figure 4, during the on-time (t
ON
) of a PWM period, V
OUT
is driven high forcing
voltage across a phase winding and increasing the current. During t
OFF,
PWM off-time, the V
OUT
high-side
DMOS is switched off, the phase winding inductive energy is recirculated, and the current decreases. To
minimize the voltage drop and the resulting energy loss during recirculation, a low-side DMOS synchronous
switch is provided, as shown in Figure 3. This low-side DMOS device has a 2-A minimum current limit to prevent
device failures should a solder bridge occur between the adjacent V
PWR
and V
OUT
terminals.
IRECIRCULATE
IMOTOR
tON
tOFF
IDRIVE
tPWM
PWM
Time
Figure 4. Motor Current Waveform
The V
OUT
circuit is protected by the global thermal shutdown of the THMC40 and THMC41 by turning off both
the high-side and low-side DMOS drivers when an over-temperature condition is detected. V
OUT
is also held
off when the charge-pump voltage (V
CP
) is lower than its undervoltage lock-out threshold, V
CP(UVLO)
.
相關PDF資料 |
PDF描述 |
|---|---|
| THS0842EVM | THS0842EVM(THS0842評估板) |
| THS10064EVM | THS10064 Evaluation Module(THS10064評估模塊) |
| THS1040IDWR | 3-V, 10-BIT , 40-MSPS CMOS ANALOG TO DIGITAL CONVERTER |
| THS1040CDWR | LABELS,CABLE MARKERS,CABLE MARKERS,LABELS, CABLE MARKERS,WIRE IDENTIFICATION AND MARKING SYSTEMS,SCOTCHCODE? WIRE MARKER TAPE REFILLS RoHS Compliant: Yes |
| THS1040CPWR | TAPE,SCOTCHCODE? WIRE MARKER TAPE REFILLS FOR WIRE MARKER TAPE DISPENSER,TAPE,SCOTCHCODE SDR WIRE MARKER TAPE REFILL A" RoHS Compliant: Yes |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| THMC45 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:5-V AND 3.3-V DC BRUSHLESS FAN MOTOR DRIVER WITH SINGLE WIRE CONTOL |
| THMC50 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE/LOCAL TEMPERATURE MONITOR AND FAN CONTROLLER WITH SMBus INTERFACE |
| THMC50DBQR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| THMC50SSOPDBQ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:REMOTE/LOCAL TEMPERATURE MONITOR AND FAN CONTROLLER WITH SMBus INTERFACE |
| THMC51DBQR | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述: |
發(fā)布緊急采購，3分鐘左右您將得到回復。