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TC653GDVUA Fiches technique(PDF) 5 Page - Microchip Technology

No de pièce TC653GDVUA
Description  Integrated Temperature Sensor & Brushless DC Fan Controller
Download  14 Pages
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Fabricant  MICROCHIP [Microchip Technology]
Site Internet  http://www.microchip.com
Logo MICROCHIP - Microchip Technology

TC653GDVUA Fiches technique(HTML) 5 Page - Microchip Technology

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© 2002 Microchip Technology Inc.
DS21453B-page 5
TC652/TC653
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 (FanSensetechnology). 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)
TABLE 3-2:
TEMPERATURE RANGE
DEFINITION FOR TC653
(AUTO-SHUTDOWN MODE)
FIGURE 3-1:
FUNCTIONAL BLOCK
DIAGRAM
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.
Temperature
(T = TJ)
PWM Duty Cycle
T< TL
40%
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)
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% withOver-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.
Temp Sensor
Fan Detect
Logic
Duty Cycle
Logic
Control
AD Converter
Oscillator
Temperature
Set Point and
Trim Range
SHDN
TOVER
PWM
FAULT
90mV
VDD
V+
CMPTR
+
-
20k
-
-


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