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TC648 датащи(PDF) 7 Page - Microchip Technology

номер детали TC648
подробное описание детали  Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert
PDF  28 Pages
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производитель  MICROCHIP [Microchip Technology]
домашняя страница  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC648 датащи(HTML) 7 Page - Microchip Technology

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 2001-2012 Microchip Technology Inc.
DS21448D-page 7
TC648
FIGURE 3-1:
TC648 Nominal Operation.
4.0
SYSTEM BEHAVIOR
The flowcharts describing the TC648’s behavioral
algorithms 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 shut-
down 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) Branch to Normal Operation.
(4) End.
4.2
Normal Operation
Normal Operation is an endless loop which may only
be exited by entering shutdown or auto-shutdown
mode. The loop can be thought of as executing at the
frequency of the oscillator and PWM.
(1) Drive VOUT to a duty cycle proportional to VIN on a
cycle by cycle basis.
(2) If an over-temperature fault occurs, (VIN > VOTF),
activate OTF; release OTF when VIN < VOTF.
(3) Is the TC648 in shutdown or auto-shutdown
mode?
If so.....
a. VOUT duty cycle goes to zero.
b. OTF is disabled.
c. Exit the loop and wait for VIN > (VAS + VHAS),
then execute Power-up sequence.
(4) End.
2.6V
VAS + VHAS
VIN
tRESET
VREL
VSHDN
VAS
1.2V
TC646
Status
Normal
Operation
Auto-Shutdown
Mode
Normal
Operation
Shut-
Down
Normal
Operation
GND
Time
TEMP.
HI
LO



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