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PDF TC653 Data sheet ( Hoja de datos )
| Número de pieza | TC653 | |
| Descripción | (TC652 / TC653) Integrated Temperature Sensor & Brushless DC Fan Controller | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de TC653 (archivo pdf) en la parte inferior de esta página. Total 14 Páginas | ||
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TC652/TC653
Integrated Temperature Sensor & Brushless DC Fan
Controller with FanSense™ Detect & Over-Temperature
Features
• Integrated Temperature Sensing and Multi-speed
Fan Control
• FanSense™ Fan Fault Detect Circuitry
• Built-in Over-Temperature Alert (TOVER)
• Temperature Proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
• Pulse Width Modulation Output Drive for Cost
and Power Savings
• Solid-State Temperature Sensing
• ±1°C (Typical) Accuracy from 25°C to +70°C
• 2.8V – 5.5V Operating Range
• TC653 includes Auto Fan Shutdown
• Low Operating Current: 50µA (Typical)
Applications
• Thermal Protection For Personal Computers
• Digital Set-Top Boxes
• Notebook Computers
• Data Communications
• Power Supplies
• Projectors
Related Literature
• Application Note: AN771
Device Selection Table
Part Number
TC652XXVUA
TC653XXVUA
Package
8-Pin MSOP
8-Pin MSOP
Temperature Range
-40°C to +125°C
-40°C to +125°C
Package Type
VDD 1
FAULT 2
SHDN 3
GND 4
MSOP
TC652
TC653
8 PWM
7 GND
6 TOVER
5 SENSE
General Description
The TC652/TC653 are integrated temperature sensors
and brushless DC fan speed controllers with
FanSense™ technology. The TC652/TC653 measure
their junction temperature and control the speed of the
fan based on that temperature, making them especially
suited for applications in modern electronic equipment.
The FanSense™ Fan Fault detect circuitry eliminates
the need for a more expensive 3-wire fan.
Temperature data is converted from the on-chip
thermal sensing element and translated into a
fractional fan speed from 40% to 100%. A temperature
selection guide in the data sheet is used to choose the
low and high temperature limits to control the fan. The
TC652/TC653 also include a single trip point over
temperature alert (TOVER) that eliminates the need for
additional temperature sensors. In addition, the TC653
includes an auto fan shutdown function for additional
power savings.
The TC652/TC653 are easy to use, require no software
overhead and are therefore the ideal choice for
implementing thermal management in a variety of
systems.
X Temperature
A 25
B 30
C 35
D 40
E 45
F 50
G 55
The "X" denotes a suffix for temperature threshold settings.
Contact factory for other temperature ranges.
© 2002 Microchip Technology Inc.
DS21453B-page 1
1 page  
3.0 DETAILED DESCRIPTION
The TC652/TC653 acquire and convert their junction
temperature (TJ) information from an on-chip solid
state sensor with a typical accuracy of ±1°C. The
temperature data is digitally stored in an internal
register. The register is compared with pre-defined
threshold values. The six threshold values are equally
distributed over a pre-defined range of temperatures
(See Table 3-1 and Table 3-2). The TC652/TC653
control the speed of a DC brushless fan using a
fractional speed control scheme. The output stage
requires only a 2N2222-type small-signal BJT for fans
up to 300mA. For larger current fans (up to 1 Amp) a
logic-level N-channel MOSFET may be used. In
addition to controlling the speed of the fan, the TC652/
TC653 include an on-chip over-temperature alarm
(TOVER) that gives a low-true signal when the
temperature of the chip exceeds TH by 10°C. This
feature eliminates the need for a separate temperature
sensor for over-temperature monitoring.
In normal fan operation, a pulse-train is present at
SENSE, Pin 5. A Missing Pulse Detector monitors this
pin during fan operation (FanSense™ technology). A
stalled, open, or unconnected fan causes the TC652/
TC653 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. To release the fan from
shutdown, toggle the SHDN or VDD pin.
TABLE 3-1:
TEMPERATURE RANGE
DEFINITION FOR TC652
(MINIMUM-SPEED MODE)
Temperature
(T = TJ)
PWM Duty Cycle
T < TL
TL< = T < T1
T1 < = T < T2
T2 < = T <T3
T3 < = T < T4
T4 < = T < TH
TH < = T < TOV
TOV < = T
40%
50%
60%
70%
80%
90%
100%
100% with Over-Temp Alert
(TOVER = L)
© 2002 Microchip Technology Inc.
TC652/TC653
TABLE 3-2:
TEMPERATURE RANGE
DEFINITION FOR TC653
(AUTO-SHUTDOWN MODE)
Temperature
(T = TJ)
PWM Duty Cycle
T < TL
“OFF”
TL< = T < T1
50%
T1 < = T < T2
60%
T2 < =T < T3
70%
T3 < =T < T4
80%
T4 < = T < TH
90%
TH < = T < TOV
100%
TOV < = T 100% with Over-Temp Alert
(TOVER = L)
Note: The temperature regions defined by the six tempera-
ture thresholds are pre-defined in the TC650/651 by means
of trimming. Once a TL and TH are programmed, the T1 - T4
thresholds are automatically equally spaced between TL and
TH.
FIGURE 3-1:
FUNCTIONAL BLOCK
DIAGRAM
VDD
TOVER
SHDN
V+
Temperature
Set Point and
Trim Range
Duty Cycle
Logic
Control
PWM
-
AD Converter
Temp Sensor
Fan Detect
Logic
Oscillator
+
CMPTR
-
90mV
-
20k
FAULT
3.1 PWM Output
The PWM pin is designed to drive a low cost transistor
or MOSFET as the low side power switching element in
the system. This output has an asymmetric
complementary drive and is optimized for driving NPN
transistors or N-channel MOSFETs. Since the system
relies on PWM rather than linear power control, the
dissipation in the power switch is kept to a minimum.
Generally, very small devices (TO-92 or SOT
packages) will suffice. The frequency of the PWM is
about 15Hz. The PWM is also the time base for the
Start-up Timer (see paragraphs below). The PWM duty
cycle has a range of 40% to 100% for the TC652 and
50% to 100% for the TC653.
DS21453B-page 5
5 Page 
TC652/TC653
SALES AND SUPPORT
Data Sheets
Products supported by a preliminary Data Sheet may have an errata sheet describing minor operational differences and recom-
mended workarounds. To determine if an errata sheet exists for a particular device, please contact one of the following:
1. Your local Microchip sales office
2. The Microchip Corporate Literature Center U.S. FAX: (480) 792-7277
3. The Microchip Worldwide Site (www.microchip.com)
Please specify which device, revision of silicon and Data Sheet (include Literature #) you are using.
New Customer Notification System
Register on our web site (www.microchip.com/cn) to receive the most current information on our products.
© 2002 Microchip Technology Inc.
DS21453B-page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TC653.PDF ] | |
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