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參數(shù)資料
| 型號(hào)： | TC649VUA |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | BRUSHLESS DC MOTOR CONTROLLER, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 26/28頁(yè) |
| 文件大?。?/td> | 478K |
| 代理商： | TC649VUA |
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2002 Microchip Technology Inc.
DS21449C-page 7
TC649
4.0
SYSTEM BEHAVIOR
The flowcharts describing the TC649’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
or auto-shutdown mode (VIN > VAS)...
(2) Turn VOUT 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 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, auto-shutdown
mode or Fan Fault. The loop can be thought of as exe-
cuting at the frequency of the oscillator and PWM.
(1) Reset the missing pulse detector.
(2) Is TC649 in shutdown or auto-shutdown mode? If
so…
a. VOUT duty cycle goes to zero.
b. FAULT is disabled.
c. Exit the loop and wait for VIN > (VAS + VHAS) to
resume operation.
(3) Drive VOUT to a duty cycle proportional to VIN on a
cycle by cycle basis.
(4) If a fan pulse is detected, branch back to the start
of the loop (1).
(5) If the missing pulse detector times out …
(6) 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…
(7) 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…
(8) Quit Normal Operation and go to Fan Fault.
(9) End.
4.3
Fan Fault
Fan Fault is an infinite loop wherein the TC649 is
latched in shutdown mode. This mode can only be
released by a reset (i.e., VIN being brought below
VSHDN, then above (VAS + VHAS) or by power-cycling).
(1) While in this state, FAULT is latched on (low) and
the VOUT output is disabled.
(2) A reset sequence applied to the VIN pin will exit the
loop to Power-up.
(3) End.
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