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TDA21801 Dataheets PDF



Part Number TDA21801
Manufacturers Infineon Technologies
Logo Infineon Technologies
Description Low Cost Fan Speed Controller
Datasheet TDA21801 DatasheetTDA21801 Datasheet (PDF)

Version 2.11, May 2005 Datasheet DS-FanControl-TDA21801 www.DataSheet4U.com TDA21801 Authors: E. Chang 1) G. Bernacchia 2) N. Florio 2) R. Pittassi 2) G. Capodivacca 2) Published by Infineon Technologies AG http://www.infineon.com/dcdc 1) Villach, Infineon Technologies Austria AG 2) Padova, Infineon Technologies Italia S.r.l. Power Management & Drive N e v e r s t o p t h i n k i n g. FanControl Page 1 of 30 DS-FanControl-TDA21801 Contents: 1. Features .

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Version 2.11, May 2005 Datasheet DS-FanControl-TDA21801 www.DataSheet4U.com TDA21801 Authors: E. Chang 1) G. Bernacchia 2) N. Florio 2) R. Pittassi 2) G. Capodivacca 2) Published by Infineon Technologies AG http://www.infineon.com/dcdc 1) Villach, Infineon Technologies Austria AG 2) Padova, Infineon Technologies Italia S.r.l. Power Management & Drive N e v e r s t o p t h i n k i n g. FanControl Page 1 of 30 DS-FanControl-TDA21801 Contents: 1. Features ...................................................................................................................... 4 2. Applications ................................................................................................................. 4 3. Pinout and Description .................................................................................................. 4 4. General Description...................................................................................................... 5 4.1 Block Diagram..................................................................................................................... 7 www.DataSheet4U.com 4.1.1 External Components Recommendation Values........................................................... 7 4.2 Application Circuit.............................................................................................................. 8 4.3 Absolute Maximum Ratings............................................................................................... 9 4.4 Thermal Characteristic ....................................................................................................... 9 4.5 Operating Condition ......................................................................................................... 10 6 Application Information ................................................................................................ 11 6.1 Filter and Amplifier parameters ....................................................................................... 11 6.2 Oscillator parameters ....................................................................................................... 12 6.2.1 Electrical Characteristic 13 6.3 Digital Control parameters............................................................................................... 15 6.3.1 Function of the speed loop 15 6.4 Power Output Stage parameters ..................................................................................... 15 6.4.1 Electrical Characteristic – Power Output Stage 16 6.5 Speed Value Generation parameters .............................................................................. 17 6.6 NTC input .......................................................................................................................... 19 6.6.1 Electrical Characteristic - NTC 19 6.7 FCin Input.......................................................................................................................... 21 6.7.1 Electrical Characteristic - FCin 22 6.8 Under Voltage Lockout Block .......................................................................................... 23 6.8.1 Electrical Characteristic – Undervoltage Lockout 24 DS-FanControl-TDA21801 FanControl Page 2 of 30 6.8 FanM .................................................................................................................................. 25 6.8.1 Electrical Characteristic – FanM Signal 25 7. Outline Dimension: ..................................................................................................... 27 7.1 Footprint Drawing PG-DSO-8........................................................................................... 27 www.DataSheet4U.com FanControl Page 3 of 30 DS-FanControl-TDA21801 TDA21801 Low Cost Fan Speed Controller 1. Features • • • • • www.DataSheet4U.com • Low cost Fan Speed Controller for standard two wires fans No external components for fan speed loop compensation necessary Tacho output signal, FanM for speed measurement Adjustable minimum Fan Speed External control voltage for fan speed setting PG-DSO-8 System Overtemperature Protection for early warning and for system shutdown. 2. Applications • Fan Speed Control for PC Desktop Silver Box Power Supply Type TDA21801 Package PG-DSO-8 Marking 21801 Ordering Code Q67042-S4257 3. Pinout and Description TOP VIEW TDA21801 FCin RSin TRSOUT GND 1 2 3 4 8 7 6 5 VDD NTC FanM RC-VCO N° 1 2 3 4 5 6 7 8 Name FCin RSin TRSOUT GND RC-VCO FanM NTC VDD Sense-resistor input signal Description Analog input for external speed control Output to drive the external PNP transistor Ground VCO adjustment for minimum (minimal) frequency and OTP-psu-shut-down. Digital output for speed monitoring. Two pulses per revolution signal. Monitor for OTP-early warning and OTP-psu-shut-down warning. Analog input for temperature sensor (NTC divider) Supply voltage FanControl Page 4 of 30 DS-FanControl-TDA21801 4. General Description The Fan Speed C.


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