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参数资料
| 型号： | TC642DEMO |
| 厂商： | Microchip Technology Inc. |
| 英文描述： | PWM Fan Speed Controller with FanSense⑩ Technology |
| 中文描述： | 与FanSense PWM风扇速度控制器⑩技术 |
| 文件页数： | 7/28页 |
| 文件大小： | 485K |
| 代理商： | TC642DEMO |
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2002 Microchip Technology Inc.
DS21444C-page 7
TC642
4.0
SYSTEM BEHAVIOR
The flowcharts describing the TC642’s behavioral
algorithm are shown in Figure 4-1. They can be
summarized as follows:
4.1
Power-Up
(1) Assuming the device is not being held in shutdown
mode (V
MIN
> V
REL
)…
(2) Turn V
OUT
output on for 32 cycles of the PWM
clock. This ensures that the fan will start from a
dead stop.
(3) During this Start-up Timer, if a fan pulse is
detected, branch to Normal Operation; if none are
received…
(4) Activate the 32-cycle Start-up Timer one more
time and look for a fan pulse; if a fan pulse is
detected, proceed to Normal Operation; if none
are received…
(5) Proceed to Fan Fault.
(6) End.
4.2
Normal Operation
Normal Operation is an endless loop which may only
be exited by entering shutdown mode or Fan Fault. The
loop can be thought of as executing at the frequency of
the oscillator and PWM.
(1) Reset the missing pulse detector.
(2) Is TC642 in shutdown If so…
a. V
OUT
duty cycle goes to zero.
b. FAULT is disabled.
c. Exit the loop and wait for V
MIN
> V
REL
to
resume
operation
power-up).
(3) If an over-temperature fault occurs (V
IN
> V
OTF
),
activate FAULT; release FAULT when V
IN
< V
OTF
.
(4) Drive V
OUT
to a duty cycle proportional to the
greater of V
IN
and V
MIN
on a cycle by cycle basis.
(5) If a fan pulse is detected, branch back to the start
of the loop (1).
(indistinguishable
from
(6) If the missing pulse detector times out …
(7) Activate the 3-cycle Diagnostic Timer and look for
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
(8) Activate the 32-cycle Start-up Timer and look for
pulses; if a fan pulse is detected, branch back to
the start of the loop (1); if none are received…
(9) Quit Normal Operation and go to Fan Fault.
(10) End.
4.3
Fan Fault
Fan fault is an infinite loop wherein the TC642 is
latched in shutdown mode. This mode can only be
released by a reset (i.e., V
MIN
being brought below
V
SHDN
, then above V
REL
, or by power-cycling).
(1) While in this state, FAULT is latched on (low) and
the
V
OUT
output is disabled.
(2) A reset sequence applied to the V
MIN
pin will exit
the loop to Power-Up.
(3) End.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TC642DEMO | 制造商:Microchip Technology Inc 功能描述:Tools Development kit For Use |
| TC642EOA | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC642EOA713 | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
| TC642EPA | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:PWM Fan Speed Controller with FanSense⑩ Technology |
| TC642EUA | 功能描述:马达/运动/点火控制器和驱动器 w/Fault Dtct RoHS:否 制造商:STMicroelectronics 产品:Stepper Motor Controllers / Drivers 类型:2 Phase Stepper Motor Driver 工作电源电压:8 V to 45 V 电源电流:0.5 mA 工作温度:- 25 C to + 125 C 安装风格:SMD/SMT 封装 / 箱体:HTSSOP-28 封装:Tube |
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