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TC648EOA Fiches technique(PDF) 8 Page - Microchip Technology

No de pièce TC648EOA
Description  Fan Speed Controller with Auto-Shutdown and Over-Temperature Alert
Download  28 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC648EOA Fiches technique(HTML) 8 Page - Microchip Technology

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TC648
DS21448C-page 8
 2002 Microchip Technology Inc.
FIGURE 4-1:
TC648 Behavioral Algorithm Flowcharts.
VOUT = 0
VIN > VOTF?
Auto-
Shutdown
VOUT = 0
No
Yes
Normal
Operation
VIN < VAS ?
No
Yes
VOUT Duty
Cycle Prop.
to VIN
OTF = 0
OTF = 1
No
YES
Fire Start-up
Timer
Normal
Operation
VAS ≈ 0V
VIN < VAS?
Auto-
Shutdown
VOUT = 0
Yes
No
Yes
Power-Up
Minimum
Speed Mode
Power-on
Reset
OTF = 1
VIN >
(VAS + VHAS)
No
Power-Up
VIN ≈ 0V ?
VIN > 1.25V ?
VIN > 1.25V
No
No
Yes
Yes
No
Yes
Yes
Minimum
Speed Mode
No
VOUT = 0
OTF = 0
VIN > VOTF?
VOUT Duty Cycle Proportional to VIN
OTF = 1


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