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TC647VUATR

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
2001-2012 Microchip Technology Inc. DS21447D-page 1
TC647
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 TC647
Supply Voltage
- Supports any Fan Voltage
• FanSense™
Technology 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
Applications
• Power Supplies
• Personal Computers
•File Servers
• Telecom Equipment
• UPSs, Power Amps
• General Purpose Fan Speed Control
Available Tools
• Fan Controller Demonstration Board (TC642DEMO)
• Fan Controller Evaluation Kit (TC642EV)
Package Types
General Description
The TC647 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 V
IN
furnishes the
required control voltage of 1.25V to 2.65V (typical) for
0% to 100% PWM duty cycle. Minimum fan speed is
set by a simple resistor divider on the V
MIN
input. An
integrated Start-up Timer ensures reliable motor start-
up at turn-on, coming out of shutdown mode or
following a transient fault. A logic low applied to V
MIN
(Pin 3) causes fan shutdown.
The TC647 also features Microchip Technology's pro-
prietary FanSense™ technology for increasing system
reliability. In normal fan operation, a pulse train is pres-
ent at SENSE (Pin 5). A missing pulse detector moni-
tors this pin during fan operation. A stalled, open or
unconnected fan causes the TC647 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.
The TC647 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
TC647
GND
C
F
V
IN
V
MIN FAULT
SENSE
V
DD
V
OUT
SOIC/PDIP/MSOP
PWM Fan Speed Controller with FanSense
™
Technology
TC647
DS21447D-page 2 2001-2012 Microchip Technology Inc.
Functional Block Diagram
FAULT
SHDN
SENSE
GND
70mV (typ.)
10kΩ
V
MIN
V
IN
C
F
V
DD
V
OUT
TC647
Control
Logic
V
SHDN
+
–
–
+
+
–
+
–
3 x T
PWM
Timer
Start-up
Timer
Clock
Generator
Missing
Pulse
Detect.
2001-2012 Microchip Technology Inc. DS21447D-page 3
TC647
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 mA Pins 6, 7 Open,
C
F
= 1 µF, V
IN
= V
C(MAX)
I
DD(SHDN)
Supply Current,
Shutdown Mode
— 25 — µA Pins 6, 7 Open,
C
F
= 1 µF, V
MIN
= 0.35V
I
IN
V
IN
,
V
MIN
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
MIN
) 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
V
IN
, V
MIN
Inputs
V
C(MAX)
Input Voltage at V
IN
or V
MIN
for
100% PWM Duty Cycle
2.5 2.65 2.8 V
V
C(SPAN)
V
C(MAX)
- V
C(MIN)
1.3 1.4 1.5 V
V
SHDN
Voltage Applied to V
MIN
to
Ensure Shutdown Mode
—— V
DD
x 0.13 V
V
REL
Voltage Applied to V
MIN
to
Release Shutdown Mode
V
DD
x 0.19 — — V V
DD
= 5V
Pulse Width Modulator
F
PWM
PWM Frequency 26 30 34 Hz C
F
= 1.0 µF
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
t
STARTUP
Start-up Timer — 32/F — Sec
t
DIAG
Diagnostic Timer — 3/F — Sec
Note 1: Ensured by design, not tested.
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

TC647VUATR

Mfr. #:
Buy TC647VUATR
Manufacturer:
Microchip Technology
Description:
Motor / Motion / Ignition Controllers & Drivers w/Fault Dtct
Lifecycle:
New from this manufacturer.
Delivery:
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