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TC642CPA

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28
2001-2012 Microchip Technology Inc. DS21444D-page 1
TC642
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 TC642
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
• Personal Computers
•File Servers
• Telecom Equipment
• UPSs, Power Amps, etc.
• General Purpose Fan Speed Control
Available Tools
• Fan Controller Demonstration Board (TC642DEMO)
• Fan Controller Evaluation Kit (TC642EV)
Package Types
General Description
The TC642 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. 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 TC642 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 TC642 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 TC642 is available in the standard 8-pin plastic
DIP, SOIC and MSOP packages and is available in the
commercial, extended commercial and industrial
temperature ranges.
18
27
36
45
TC642
GND
C
F
V
IN
V
MIN FAULT
SENSE
V
DD
V
OUT
SOIC/PDIP/MSOP
PWM Fan Speed Controller with FanSense
™
Technology
TC642
DS21444D-page 2 2001-2012 Microchip Technology Inc.
Functional Block Diagram
FAULT
SHDN
SENSE
OTF
GND
70mV (typ.)
10kΩ
V
MIN
V
IN
C
F
V
DD
V
OUT
TC642
Control
Logic
+
–
V
OTF
V
SHDN
+
–
–
+
+
–
+
–
3 x T
PWM
Timer
Start-up
Timer
Clock
Generator
Missing
Pulse
Detect
2001-2012 Microchip Technology Inc. DS21444D-page 3
TC642
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.
ELECTRICAL SPECIFICATIONS
Note 1: Ensured by Design, not tested.
Electrical Characteristics: T
MIN
< T
A
< T
MAX
, V
DD
= 3.0V to 5.5V, unless otherwise specified.
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 Mode — 25 — µA Pins 6, 7 Open,
C
F
= 1 µF, V
MIN
= 0.35V,
Note 1
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),
V
OTF
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
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18P19-P21P22-P24P25-P27P28-P28

TC642CPA

Mfr. #:
Buy TC642CPA
Manufacturer:
Microchip Technology
Description:
Motor / Motion / Ignition Controllers & Drivers w/Fault Dtct
Lifecycle:
New from this manufacturer.
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