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PDF TC650 Data sheet ( Hoja de datos )
| Número de pieza | TC650 | |
| Descripción | (TC650 / TC651) Tiny Integrated Temperature Sensor & Brushless DC Fan Controller | |
| Fabricantes | Microchip Technology | |
| Logotipo |  |
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TC650/TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Over-Temperature Alert
Features
• Integrated Temperature Sensing and Multi-speed
Fan Control
• 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
• TC651 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 Package
TC650XXVUA 8-Pin SOIC
TC651XXVUA 8-PinMSOP
Temperature
Range
-40°C to +125°C
-40°C to +125°C
Package Type
8-Pin MSOP
8-Pin SOIC
VDD 1
NC 2
SHDN 3
GND 4
TC650
TC651
8 PWM
7 GND
6 TOVER
5 NC
General Description
The TC650/TC651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/
TC651 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.
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
TC650/TC651 also include a single trip point over
temperature alert (TOVER) that eliminates the need for
additional temperature sensors. In addition, the TC651
features an auto fan shutdown function for additional
power savings.
The TC650/TC651 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.
DS21450B-page 1
1 page  
3.0 DETAILED DESCRIPTION
The TC650/TC651 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 TC650/TC651 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 TC650/TC651 include an on-chip
over-temperature alarm (TOVER) that gives a low signal
when the temperature of the chip exceeds TH by 10°C,
(typical). This feature eliminates the need for a separate
temperature sensor for over-temperature monitoring.
TABLE 3-1:
TEMPERATURE RANGE
DEFINITION FOR TC650
(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)
TABLE 3-2:
TEMPERATURE RANGE
DEFINITION FOR TC651
(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 temperature thresh-
olds are pre-defined in the TC650/TC651 by means of trimming. Once
a TL and TH are programmed, the T1 – T4 thresholds are automatically
equally spaced between TL and TH.
TC650/TC651
FIGURE 3-1:
FUNCTIONAL BLOCK
DIAGRAM
VDD
TOVER SHDN
V+
Temperature
Set Point and
Trim Range
Duty Cycle
Logic
Control
PWM
A/D Converter
Temperature Sensor
Oscillator
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 TC650 and
50% to 100% for the TC651.
3.2 Start-Up Timer
To ensure reliable fan start-up, the Start-up Timer turns
PWM high for about 2 seconds whenever the fan is
started from the off state. This occurs at power-up and
when coming out of Shutdown mode.
3.3 Over-Temperature Alert (TOVER)
This pin goes low when the TH set point is exceeded by
10oC (typical). This indicates that the fan is at
maximum drive and the potential exists for system
overheating; either heat dissipation in the system has
gone beyond the cooling system's design limits, or
some FAULT exists such as fan bearing failure or an
airflow obstruction. This output may be treated as a
“System Overheat” warning and used to trigger system
shutdown, or bring other fans to full speed in the
system. The fan will continue to run at 100% speed
while TOVER is asserted. Built-in hysteresis prevents
TOVER from “chattering” when measured temperature
is at or near the TH + 10°C trip point. As temperature
falls through the TH + 10°C trip point, hysteresis
maintains the TOVER output low until measured
temperature is 5°C above the trip point setting.
© 2002 Microchip Technology Inc.
DS21450B-page 5
5 Page 
TC650/TC651
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.
DS21450B-page 11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet TC650.PDF ] | |
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