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参数资料
| 型号： | THMC41DR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 1.5 A, PDSO14 |
| 封装： | PLASTIC, SOP-14 |
| 文件页数： | 18/19页 |
| 文件大小： | 300K |
| 代理商： | THMC41DR |
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 (VOUT)
Referring to Figure 3, VOUT 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 VOUT DMOS output transistor has a typical RDS(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
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 (tON) of a PWM period, VOUT is driven high forcing
voltage across a phase winding and increasing the current. During tOFF, PWM off-time, the VOUT 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 VPWR and VOUT terminals.
IRECIRCULATE
IMOTOR
tON
tOFF
IDRIVE
tPWM
PWM
Time
Figure 4. Motor Current Waveform
The VOUT 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. VOUT is also held
off when the charge-pump voltage (VCP) is lower than its undervoltage lock-out threshold, VCP(UVLO).
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| THMC41SOPD | 制造商:TI 制造商全称:Texas Instruments 功能描述:VARIABLE SPEED 12-VDC BRUSHLESS FAN MOTOR DRIVERS |
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| THMC50DBQR | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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