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參數(shù)資料
| 型號： | TC642BEOA |
| 元件分類： | 運動控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | 0.150 INCH, PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 7/34頁 |
| 文件大?。?/td> | 683K |
| 代理商： | TC642BEOA |
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2003 Microchip Technology Inc.
DS21756B-page 15
TC642B/TC647B
.
FIGURE 4-7:
Fan Current With
Commutation Pulses To Zero.
The SENSE pin senses positive voltage pulses that
have an amplitude of 70 mV (typical value). When a
pulse is detected, the missing pulse detector timer is
reset. As previously stated, if the missing pulse detec-
tor timer reaches the time for 32 cycles, the loop for
diagnosing a fan fault is engaged (diagnostic timer,
then the start-up timer).
Both of the fan current waveshapes that are shown in
scheme shown in Figure 4-8.
FIGURE 4-8:
Sensing Scheme For Fan
Current.
The fan current flowing through RSENSE generates a
voltage that is proportional to the current. The CSENSE
capacitor removes any DC portion of the voltage
across RSENSE and presents only the voltage pulse
portion to the SENSE pin of the TC642B/TC647B
devices.
The RSENSE and CSENSE values need to be selected so
that the voltage pulse provided to the SENSE pin is
70 mV (typical) in amplitude. Be sure to check the
sense pulse amplitude over all operating conditions
(duty cycles), as the current pulse amplitude will vary
with duty cycle. See Section 5.0, “Applications Informa-
tion”, for more details on selecting values for RSENSE
and CSENSE.
Key features of the SENSE pin circuitry are an initial
blanking period after every VOUT pulse and an initial
pulse blanker.
The TC642B/TC647B sense circuitry has a blanking
period that occurs at the turn-on of each VOUT pulse.
During this blanking period, the sense circuitry ignores
any pulse information that is seen at the SENSE pin
input. This stops the TC642B/TC647B device from
falsely sensing a current pulse which is due to the fan
drive device turn-on.
The initial pulse blanker is also implemented to stop
false sensing of fan current pulses. When a fan is in a
locked rotor condition, the fan current no longer com-
mutates, it simply flows through one fan winding and is
a DC current. When a fan is in a locked rotor condition
and the TC642B/TC647B device is in PWM mode, it
will see one current pulse each time the VOUT output is
turned on. The initial pulse blanker allows the TC642B/
TC647B device to ignore this pulse and recognize that
the fan is in a fault condition.
4.9
Behavioral Algorithms
The behavioral algorithm for the TC642B/TC647B
devices is shown in Figure 4-9.
The behavioral algorithm shows the step-by-step deci-
sion-making process for the fan speed controller oper-
ation. The TC642B and TC647B devices are very
similar with one exception: the TC647B device does
not implement the over-temperature portion of the
algorithm.
RISO
RSENSE
CSENSE
(0.1 F typical)
SENSE
VOUT
TC64XB
GND
FAN
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TC642BEOA713 | 功能描述:馬達/運動/點火控制器和驅(qū)動器 w/Rstrt & Flt Dtct 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 |
| TC642BEOAG | 制造商:Microchip Technology 功能描述:Fan Control Demo Board |
| TC642BEOATR | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection |
| TC642BEPA | 功能描述:馬達/運動/點火控制器和驅(qū)動器 w/Rstrt & Flt Dtct 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 |
| TC642BEPA713 | 制造商:MICROCHIP 制造商全稱:Microchip Technology 功能描述:PWM Fan Speed Controllers With Minimum Fan Speed, Fan Restart and FanSense⑩ Technology for Fault Detection |
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