TDA21801 – Fan Speed Controller
W I T H T H E N E W fans peed controller TDA21801,
essential system monitoring features of switched mode
power supplies (SMPS) such as adjustable minimum fan
speed, fan ON/OFF and over-temperature protection (OTP)
can be easily implemented. Only few external compo-
nents added to the IC are necessary for it.
T H E T D A 2 1 8 0 1 is designed for applications
using 3- or 4-wire fan solutions like PC silver boxes,
Server silver box AC/DC converter and industrial/medical
power supplies.
Benefits
C
Full control over fan speed due to precision reference
C
Low system cost when replacing 4-wire fans
C
Reduced noise level
C
Increased safety of power supplies
Features
C
In combination with 2-wire fans same functionality as
4-wire fan solution
C
Overtemperature protection feature to protect system
and power supply
C
Adjustable minimum fan speed (750 rpm to 4000 rpm)
C
Fan speed can be increased by external PWM or
analogue signal
C
SO-8 Package / ROHS compliant
6
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