OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

TC646VUA713

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30
2002-2012 Microchip Technology Inc. DS21446D-page 1
DTC646
Features
• Temperature Proportional Fan Speed for Acoustic
Control and Longer Fan Life
• Efficient PWM Fan Drive
• 3.0V to 5.5V Supply Range:
- Fan Voltage Independent of TC646
Supply Voltage
- Supports any Fan Voltage
• FanSense™
Fault Detection Circuits Protect
Against Fan Failure and Aid System Testing
• Shutdown Mode for "Green" Systems
• Supports Low Cost NTC/PTC Thermistors
• Space Saving 8-Pin MSOP Package
• Over-temperature Indication
Applications
• Power Supplies
• Computers
•File Servers
• Portable Computers
• Telecom Equipment
• UPS, Power Amps
• General Purpose Fan Speed Control
Available Tools
• Fan Controller Demonstration Board (TC642DEMO)
• Fan Controller Evaluation Kit (TC642EV)
Package Types
General Description
The TC646 is a switch mode, fan speed controller for
use with brushless DC fans. Temperature proportional
speed control is accomplished using pulse width mod-
ulation (PWM). A thermistor (or other voltage output
temperature sensor) connected to the V
IN
input fur-
nishes the required control voltage of 1.25V to 2.65V
(typical) for 0% to 100% PWM duty cycle. The TC646
automatically suspends fan operation when measured
temperature (V
IN
) is below a user programmed
minimum setting (V
AS
). An integrated Start-up Timer
ensures reliable motor start-up at turn-on, coming out
of shutdown mode, auto-shutdown mode or following a
transient fault.
The TC646 features Microchip Technology's proprie-
tary FanSense™ technology for increasing system reli-
ability. In normal fan operation, a pulse train is present
at SENSE (Pin 5). A missing-pulse detector monitors
this pin during fan operation. A stalled, open, or uncon-
nected fan causes the TC646 to trigger its Start-up
Timer once. If the fault persists, the FAULT
output goes
low and the device is latched in its shutdown mode.
FAULT
is also asserted if the PWM reaches 100% duty
cycle, indicating a possible thermal runaway situation,
although the fan continues to run. See Section 5.0,
“Typical Applications”, for more information and system
design guidelines.
The TC646 is available in the 8-pin plastic DIP, SOIC
and MSOP packages and is available in the industrial
and extended commercial temperature ranges.
18
27
36
45
TC646
GND
C
F
V
IN
V
AS
FAULT
SENSE
V
DD
V
OUT
SOIC/PDIP/MSOP
PWM Fan Speed Controller with Auto-Shutdown
and FanSense
™
Technology
TC646
DS21446D-page 2 2002-2012 Microchip Technology Inc.
Functional Block Diagram
FAULT
SHDN
SENSE
PWM
OTF
GND
70mV (typ.)
10kΩ
V
AS
V
SHDN
V
IN
C
F
V
DD
V
OUT
TC646
Control
Logic
+
–
V
OTF
+
–
+
–
+
–
+
–
3 x T
PWM
Timer
Start-up
Timer
Clock
Generator
Missing
Pulse
Detect.
2002-2012 Microchip Technology Inc. DS21446D-page 3
TC646
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings*
Supply Voltage .........................................................6V
Input Voltage, Any Pin.....(GND – 0.3V) to (V
DD
+0.3V)
Package Thermal Resistance:
PDIP (R
JA
).............................................125°C/W
SOIC (R
JA
) ............................................155°C/W
MSOP (R
JA
) ..........................................200°C/W
Specified Temperature Range............-40°C to +125°C
Storage Temperature Range..............-65°C to +150°C
*Stresses above those listed under "Absolute Maximum Rat-
ings" may cause permanent damage to the device. These are
stress ratings only and functional operation of the device at
these or any other conditions above those indicated in the
operation sections of the specifications is not implied. Expo-
sure to absolute maximum rating conditions for extended peri-
ods may affect device reliability.
DC ELECTRICAL SPECIFICATIONS
Electrical Characteristics: Unless otherwise specified, T
MIN
T
A
T
MAX
, V
DD
= 3.0V to 5.5V
Symbol Parameter Min Typ Max Units Test Conditions
V
DD
Supply Voltage 3.0 — 5.5 V
I
DD
Supply Current, Operating — 0.5 1.0 mA Pins 6, 7 Open,
C
F
= 1 µF, V
IN
= V
C(MAX)
I
DD(SHDN)
Supply Current, Shutdown/
Auto-shutdown Mode
— 25 — µA Pins 6, 7 Open;
Note 1
C
F
=1 µF, V
IN
= 0.35V
I
IN
V
IN
,
V
AS
Input Leakage -1.0 — +1.0 µA Note 1
V
OUT
Output
t
R
V
OUT
Rise Time — — 50 µsec I
OH
= 5 mA, Note 1
t
F
V
OUT
Fall Time — — 50 µsec I
OL
= 1 mA, Note 1
t
SHDN
Pulse Width(On V
IN
) to Clear
Fault Mode
30 — — µsec V
SHDN
, V
HYST
Specifications,
Note 1
I
OL
Sink Current at V
OUT
Output 1.0 — — mA V
OL
= 10% of V
DD
I
OH
Source Current at V
OUT
Output
5.0 — — mA V
OH
= 80% of V
DD
SENSE Input
V
TH(SENSE)
SENSE Input Threshold
Voltage with Respect to GND
50 70 90 mV Note 1
FAULT
Output
V
OL
Output Low Voltage — — 0.3 V I
OL
= 2.5 mA
t
MP
Missing Pulse Detector Timer — 32/F — Sec C
F
= 1.0 µF
t
STARTUP
Start-up Timer — 32/F — Sec C
F
= 1.0 µF
t
DIAG
Diagnostic Timer — 3/F — Sec C
F
= 1.0 µF
Note 1: Ensured by design, not tested.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P30

TC646VUA713

Mfr. #:
Buy TC646VUA713
Manufacturer:
Microchip Technology
Description:
Motor / Motion / Ignition Controllers & Drivers Shtdn & Fault Dtct
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet