Document
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
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DS-FanControl-TDA21801
Contents:
1. Features ...................................................................................................................... 4 2. Applications ................................................................................................................. 4 3. Pinout and Description .................................................................................................. 4 4. General Description...................................................................................................... 5
4.1 Block Diagram..................................................................................................................... 7
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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
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6.8 FanM .................................................................................................................................. 25 6.8.1 Electrical Characteristic – FanM Signal 25
7. Outline Dimension: ..................................................................................................... 27
7.1 Footprint Drawing PG-DSO-8........................................................................................... 27
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FanControl
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DS-FanControl-TDA21801
TDA21801 Low Cost Fan Speed Controller
1. Features
• • • • •
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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
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DS-FanControl-TDA21801
4. General Description
The Fan Speed C.