Microchip TC651 Handleiding

Microchip Niet gecategoriseerd TC651

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 2001-2012 Microchip Technology Inc. DS21450D-page 1
TC650/TC651
Features
• Integrated Temperature Sensing and Multi-speed
Fan Control
• Built-in Overtemperature Alert (TOVER)
• Temperature-proportional Fan Speed Control for
Acoustic Noise Reduction and Longer Fan Life
• Pulse Width Modulation (PWM) Output Drive for
Cost and Power Savings
• Solid-state Temperature Sensing
• ±1C (typ.) Accuracy from 25C to +70C
• Operating Range: 2.8V – 5.5V
•TC651 includes Automatic Fan Shutdown
• Low Operating Current: 50 µA (typ.)
Applications
• Thermal Protection For Personal Computers
• Digital Set-Top Boxes
• Notebook Computers
• Data Communications
• Power Supplies
• Projectors
Related Literature
• Application Note 771 (DS00771)
General Description
The TC650/TC651 are integrated temperature sensors
and brushless DC fan speed controllers. The TC650/
TC651 measure the 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.
Package Type
18
2 7
36
45
NC
VDD PWM
TOVER
NCGND
8-Pin MSOP
SHDN
GND
TC650
TC651
Tiny Integrated Temperature Sensor & Brushless DC Fan
Controller with Overtemperature Alert
TC650/TC651
DS21450D-page 2  2001-2012 Microchip Technology Inc.
Typical Application Circuit
18
2 7
36
45
NC
VDD
CSLOW
PWM
GND
TOVER
NC
GND
GND
+5V VDD
+12V
TC650
TC651
SHDN
GND
PIC®
DC Fan
500 mA
SHDN
Control
Overtemperature
Alert
Microcontroller
 2001-2012 Microchip Technology Inc. DS21450D-page 3
TC650/TC651
1.0 ELECTRICAL
CHARACTERISTICS
Absolute Maximum Ratings†
Input Voltage (VDD to GND) ................................... +6V
Output Voltage (OUT to GND) ................................. 6V
Voltage On Any Pin ....... (GND – 0.3V) to (V
DD + 0.3V)
Operating Temperature Range ......... –40C to +125C
Storage Temperature ........................ –65 C to +150 C
† Notice: Stresses above those listed under "Absolute Maxi-
mum Ratings" 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.
Exposure to Absolute Maximum Rating conditions for
extended periods may affect device reliability.
DC CHARACTERISTICS
Electrical Specifications: Unless otherwise specified, V
DD = 2.8V to 5.5V, SHDN = VDD, TA = –40C to +125C.
Parameters Sym Min Typ Max Units Conditions
Supply Voltage VDD 2.8 — 5.5 V
Supply Current IDD — 50 90 µA PWM, TOVER are open
SHDN Input
SHDN Input High Threshold VIH 65 — — %V
DD
SHDN Input Low Threshold VIL — — 15 %VDD
PWM Output
PWM Output Low Voltage VOL — — 0.3 V ISINK = 1 mA
PWM Output High Voltage VOH VDD – 0.5 — — V ISOURCE = 5 mA
PWM Rise Time tR— 10 — µs IOH = 5 mA, 1 nF from
PWM to GND
PWM Fall Time tF— 10 — µs IOL = 1 mA, 1 nF from
PWM to GND
PWM Frequency fOUT 10 15 — Hz
Start-up Time tSTARTUP — 32/fOUT — sec VDD Rises from GND
or SHDN Released
Temperature Accuracy
High Temperature Accuracy TH ACC TH – 3 TH TH + 3 °C Note 1
Temperature Range Accuracy (TH –TL) ACC –1.0 — +1.0 °C (TH – TL)  20C
–2.5 — +2.5 °C (TH – TL)  20C
Auto-shutdown Hysteresis THYST — (TH -TL)/5 — °C TC651 Only
TOVER Output
TOVER Output High Voltage VHIGH VDD – 0.5 — — V ISOURCE = 1.2 mA
TOVER Output Low Voltage VLOW — — 0.4 V ISINK = 2.5 mA
Absolute Accuracy TOVER ACC — TH + 10 — °C At Trip Point
Trip Point Hysteresis TOVER HYST — 5 — °C
Note 1: Transition from 90% to 100% Duty Cycle.

Product specificaties

Merk: Microchip
Categorie: Niet gecategoriseerd
Model: TC651

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