TC648 Microchip, TC648 Datasheet

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TC648

Manufacturer Part Number
TC648
Description
Fan Speed Controller
Manufacturer
Microchip
Datasheet

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Features
• Temperature Proportional Fan Speed for Acoustic
• Efficient PWM Fan Drive
• 3.0V to 5.5V Supply Range:
• Over-temperature Fault Detection
• Automatic Shutdown Mode for “Green” Systems
• Supports Low Cost NTC/PTC Thermistors
• Space Saving 8-Pin MSOP Package
Applications
• Power Supplies
• Computers
• Portable Computers
• Telecom Equipment
• UPSs, Power Amps
• General Purpose Fan Speed Control
Available Tools
• Fan Controller Demonstration Board (TC642DEMO)
• Fan Controller Evaluation Kit (TC642EV)
M
Control and Longer Fan Life
- Fan Voltage Independent of TC648
- Supports any Fan Voltage
2002 Microchip Technology Inc.
Supply Voltage
Fan Speed Controller with Auto-Shutdown
and Over-Temperature Alert
Package Types
General Description
The TC648 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
furnishes the required control voltage of 1.25V to 2.65V
(typical) for 0% to 100% PWM duty cycle. The TC648
can be configured to operate in either auto-shutdown or
minimum speed mode. In auto-shutdown mode, fan
operation is automatically suspended when measured
temperature (V
minimum setting (V
restarted, and proportional speed control restored,
when V
minimum speed mode is similar to auto-shutdown
mode, with the exception that the fan is operated at a
user programmed minimum setting when the mea-
sured temperature is low. An integrated Start-up Timer
ensures reliable motor start-up at turn-on, and when
coming out of shutdown or auto-shutdown mode.
The over-temperature fault output (OTF) is asserted
when the PWM reaches 100% duty cycle, indicating a
possible thermal runaway situation.
The TC648 is available in the 8-pin plastic DIP, SOIC
and MSOP packages and is available in the industrial
and extended commercial temperature ranges.
SOIC/PDIP/MSOP
GND
V
V
C
IN
AS
IN
F
exceeds V
1
2
3
4
IN
) is lower than a user programmed
AS
AS
TC648
). The fan is automatically
(plus hysteresis). Operation in
TC648
8
7
6
5
DS21448C-page 1
V
V
OTF
NC
DD
OUT
IN
input

Related parts for TC648

TC648 Summary of contents

Page 1

... AS GND 4 5 General Description The TC648 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 furnishes the required control voltage of 1.25V to 2.65V (typical) for 0% to 100% PWM duty cycle ...

Page 2

... TC648 Functional Block Diagram SHDN GND DS21448C-page – OTF OTF – PWM + Control Logic Clock Generator – Start-up Timer + SHDN – TC648 OUT OTF NC 2002 Microchip Technology Inc. ...

Page 3

... V C(MAX) ~ C(MAX) V C(SPAN) — — 0. 0.19 — — DD — 0. — DD — 70 — TC648 Units Test Conditions V mA Pins 6, 7 Open µ C(MAX) µA Pins 6, 7 Open; Note µ 0.35V F IN µA Note 1 µsec mA, Note 1 OH µ ...

Page 4

... TC648 DC ELECTRICAL SPECIFICATIONS (CONTINUED) Electrical Characteristics: Unless otherwise specified, T Symbol Parameter Pulse Width Modulator F PWM Frequency OSC t Start-up Timer STARTUP Note 1: Ensured by design, not tested. DS21448C-page 3.0V to 5.5V MIN A MAX DD Min Typ Max Units — 32/F — Sec Test Conditions C = 1.0 µ ...

Page 5

... N-channel MOS- FET. This output has asymmetrical drive (see is 1 µF for Section 1.0, “Electrical Characteristics”). F 2.8 Power Supply Input (V V may be independent of the fan’s power supply DD (see Section 1.0, “Electrical Characteristics”). TC648 ) AS input During shutdown, supply (see Section 5 ...

Page 6

... IN IN Figure 3-1). In this mode, all functions cease and the OTF output is unconditionally inactive. The TC648 should not be shut down unless all heat producing activity in the system negligible level. The TC648 exits shutdown mode when V becomes greater than the release voltage. ...

Page 7

... Drive V OUT cycle by cycle basis. > V ).......... ( over-temperature fault occurs activate OTF; release OTF when V (3) Is the TC648 in shutdown or auto-shutdown mode? If so..... a. V duty cycle goes to zero. OUT b. OTF is disabled. c. Exit the loop and wait for V then execute Power-up sequence. ...

Page 8

... Speed Mode Yes OUT > 1.25V ? IN V > 1.25V IN Yes Power-Up V OUT Yes V > OTF = 0 OTF = 1 FIGURE 4-1: TC648 Behavioral Algorithm Flowcharts. DS21448C-page 8 Minimum Speed Mode = > HAS YES Fire Start-up Timer Normal Operation OUT ...

Page 9

... Section 5.0, "Typical Applications". **Optional. See Section 5.0, "Typical Applications", for details. FIGURE 5-1: Typical Application Circuit. 2002 Microchip Technology Inc. analysis. At the very least, anyone contemplating a design using the TC648 should consult the documen- tation for TC642DEMO (DS21401). Figure 5-1 shows the base must be schematic for the TC642DEMO ...

Page 10

... V node added benefit, this IN configuration produces an output voltage delta of 1.4V, which is well within the range of the V specification of the TC648. A 100 k NTC thermistor is selected for this application in order to keep I minimum. For the voltage range equal to 1.25V to IN 2.65V, the temperature range of this configuration is 0° ...

Page 11

... MAX AS EQUATION The V voltage may be set using a simple resistor AS divider, as shown in Figure 5-5. and FIGURE 5-5: TC648 sets the temperature at which AS drops below the set temperature input, 1.25V to 2.65V corresponds related 1. ...

Page 12

... In this case, the standard values of 34.8 k 15.4 k are very close to the calculated values and would be more than adequate. 5.4 Output Drive Transistor Selection The TC648 is designed to drive an external transistor or MOSFET for modulating power to the fan. This is shown Figures 5-1, 5-6, 5-7,and 5-8. The 1 V pin has a minimum source current and a OUT minimum sink current ...

Page 13

... V /V BE(sat) GS CEO Min (V) ( TC648 V DD Fan OUT GND C) N-Channel MOSFET Fan Current Suggested DS (mA BASE 150 800 150 800 500 301 500 Note 1 500 Note 1 1000 Note 1 500 Note 1 DS21448C-page 13 ...

Page 14

... V input should be bypassed with a 1 µF DD capacitor and grounds should be kept as short as pos- sible. To keep fan noise off the TC648 ground pin, indi- vidual ground returns for the TC648 and the low side of the fan drive device should be used. DS21448C-page 14 ...

Page 15

... Output codes 001[B] to 111[B] operate the fan from roughly 40% to 100% of full speed. An open-drain output from the processor (I/O0) can be used to reset the TC648 following detection of a fault condition. The OTF output can be connected to the processor's interrupt input another I/O pin, for polled operation ...

Page 16

... TC648 +5V Open-Drain I/O0 Outputs I/O1 Analog or Digital CMOS Temperature I/O2 Outputs Data from one or more Sensors I/O3 CMOS Microcontroller GND INT FIGURE 5-9: TC648 as a Microcontroller Peripheral. DS21448C-page 16 (RESET) (Optional 110 k 1 (MSB 240 k . 360 (LSB ...

Page 17

... Standard marking consists of Microchip part number, year code, week code, traceability code (facility code, mask rev#, and assembly code). For marking beyond this, certain price adders apply. Please check with your Microchip Sales Office. 2002 Microchip Technology Inc. TC648 Example: TC648VPA 025 0215 Example: TC648VOA 0215 025 Example: TC648E 215025 DS21448C-page 17 ...

Page 18

... TC648 8-Lead Plastic Dual In-line (P) – 300 mil (PDIP Dimension Limits Number of Pins Pitch Top to Seating Plane Molded Package Thickness Base to Seating Plane Shoulder to Shoulder Width Molded Package Width Overall Length Tip to Seating Plane Lead Thickness Upper Lead Width ...

Page 19

... A1 .004 .007 .010 E .228 .237 .244 E1 .146 .154 .157 D .189 .193 .197 h .010 .015 .020 L .019 .025 .030 .008 .009 .010 B .013 .017 .020 TC648 A2 MILLIMETERS MIN NOM MAX 8 1.27 1.35 1.55 1.75 1.32 1.42 1.55 0.10 0.18 0.25 5.79 6.02 6.20 3.71 3.91 3.99 4.80 4.90 5.00 0.25 0.38 0.51 0.48 0.62 0. 0.20 0.23 0.25 0.33 0.42 0. ...

Page 20

... TC648 8-Lead Plastic Micro Small Outline Package (MS) (MSOP (F) Dimension Limits Number of Pins Pitch Overall Height Molded Package Thickness Standoff § Overall Width Molded Package Width Overall Length Foot Length Footprint (Reference) Foot Angle Lead Thickness Lead Width Mold Draft Angle Top ...

Page 21

... Suffix Device Pitch (P) Part Per Full Reel 2500 User Direction of Feed P Standard Reel Component Orientation for 713 Suffix Device Carrier Width (W) Pitch (P) Part Per Full Reel 2500 TC648 W Reel Size Reel Size 13 in DS21448C-page 21 ...

Page 22

... TC648 NOTES: DS21448C-page 22 2002 Microchip Technology Inc. ...

Page 23

... Microchip's development systems software products. Plus, this line provides information on how customers ® ® can receive the most current upgrade kits.The Hot Line or Microsoft Numbers are: 1-800-755-2345 for U.S. and most of Canada, and 1-480-792-7302 for the rest of the world. TC648 092002 DS21448C-page23 ...

Page 24

... Telephone: (_______) _________ - _________ Application (optional): Would you like a reply? Y Device: TC648 Questions: 1. What are the best features of this document? 2. How does this document meet your hardware and software development needs you find the organization of this document easy to follow? If not, why? 4 ...

Page 25

... Shutdown and Over-Temperature Alert, SOIC package. b) TC648VUA: PWM Fan Speed Controller w/Auto Shutdown and Over-Temperature Alert, MSOP package. c) TC648VPA: PWM Fan Speed Controller w/Auto Shutdown and Over-Temperature Alert, PDIP package. d) TC648EOA713: PWM Fan Speed Controller w/Auto Shutdown and Over-Temperature Alert, SOIC package, Tape and Reel ...

Page 26

... TC648 NOTES: DS21448C-page 26 2002 Microchip Technology Inc. ...

Page 27

... Microchip Technology Incorporated with respect to the accuracy or use of such information, or infringement of patents or other intellectual property rights arising from such use or otherwise. Use of Microchip’s products as critical com- ponents in life support systems is not authorized except with express written approval by Microchip. No licenses are con- veyed, implicitly or otherwise, under any intellectual property rights ...

Page 28

... Mississauga, Ontario L4V 1X5, Canada Tel: 905-673-0699 Fax: 905-673-6509 DS21448C-page ALES AND ERVICE ASIA/PACIFIC Australia Microchip Technology Australia Pty Ltd Suite 22, 41 Rawson Street Epping 2121, NSW Australia Tel: 61-2-9868-6733 Fax: 61-2-9868-6755 China - Beijing Microchip Technology Consulting (Shanghai) Co., Ltd., Beijing Liaison Office Unit 915 Bei Hai Wan Tai Bldg ...

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