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參數資料
| 型號： | THMC45 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, 0.25 A, PDSO8 |
| 封裝： | PLASTIC, HTSSOP-8 |
| 文件頁數： | 12/14頁 |
| 文件大小： | 157K |
| 代理商： | THMC45 |
PRODUCT PREVIEW documents contain information on new
products in the definition Phase. Characteristic data and other
data specifications are subject to change without notice. This
document is to be used for discussion only and should not be
used as the basis for any design.
thmc45.doc
Copyright
2000 Texas Instruments
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7
THMC45
SINGLE-PHASE 5VDC BRUSHLESS FAN DRIVER WITH SINGLE WIRE CONTROL INTERFACE
Product Preview
Functional Description
General Overview
THMC45 is a H-bridge, single-phase DC BLM drive device with PWM RPM control that is intended
primarily for 5V DC cooling fan applications requiring speed control with a tachometer feedback signal.
The PWM duty cycle and frequency is dependent on the input signal present on the PWM input pin.
The device has an internal Hall sensor comparator/signal conditioner, a low power sleep state mode
with hall sensor bias switch, and locked rotor protection with automatic restart after a locked rotor
condition. The THMC45 uses the PWM input pin for the PWM frequency and duty cycle input, for
providing a tachometer current pulse feedback signaling, and for providing a means to for entering
sleep and run states. The THMC45 provides a more efficient drive solution to fan RPM control than
external linear voltage control. It is also considerably more efficient than controlling DC brushless fan
RPM using external low-side PWM.
Hall Sensor Comparator and Signal Conditioning Inputs (H+, H-)
The THMC45 has an internal Hall sensor comparator with signal conditioning, allowing the use of low-
cost hall sensors. The Hall signal conditioning block receives a low-level differential voltage from the
Hall position sensor and implements zero differential voltage crossing detection with a de-glitch time of
25s (typical) to reject noise on the hall signal inputs. In addition to the 25s (typical) de-glitch time, an
additional 200s (typical) ignore timer is then used to reject hall noise after the de-glitch timer has timed
out. Referring to Figure 1, the OUTA output that was sourcing current changes to sinking current after
the 25s de-glitch time is reached. Likewise, the OUTB output that was sinking current changes to
sourcing current after the 25s de-glitch time is reached. The Hall comparator circuit has an input
offset voltage, VIO, of no greater than ±7 mV. The common-mode input voltage range is 1.0 V to 3.5 V.
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