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TC646B Datasheet(PDF) 6 Page - Microchip Technology

Part # TC646B
Description  PWM Fan Speed Controllers With Auto-Shutdown, Fan Restart and FanSense??Technology for Fault Detection
PDF  36 Pages
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Manufacturer  MICROCHIP [Microchip Technology]
Direct Link  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC646B Datasheet(HTML) 6 Page - Microchip Technology

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TC646B/TC648B/TC649B
DS21755B-page 6
 2003 Microchip Technology Inc.
FIGURE 1-4:
TC646B/TC648B/TC649B Electrical Characteristics Test Circuit.
1
2
3
4
6
5
7
8
VIN
CF
VAS
GND
FAULT / OTF
SENSE
VOUT
VDD
R3
R1
C3
0.1 µF
C2
1µF
VDD
C1
0.1 µF
+
-
VIN
+
-
C4
0.1 µF
VAS
+
-
R2
K1
K2
0.1 µF
1µF
.01 µF
C7
C6
C5
R4
VSENSE
(pulse voltage source)
K4
K3
+
-
Current
limited
voltage
source
VDD
R5
Current
limited
voltage
source
C8
0.1 µF
R6
Note: C5 and C7 are adjusted to get the necessary 1 µF value.
TC646B and TC649B
TC646B
TC648B
TC649B
+
-



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