Pulse-Width Modulation
(PWM) Technology
Benefits of Deltas Advance PWM Control:
Advance soft switching control (available on certain models)
Wide PWM frequency input range (30Hz-30kHz)
Flexible speed control
Prevent current spikes
Low switching noise
Low vibration
High power efficiency
Web: www.delta-fan.com
Email: dcfansales.us@deltaww.comAdvanced Cooling Solutions Deliver Superior
Performance with Greater Efficiency
The PWM Advantage
PWM regulates the voltage signal between fully on
and fully off, controlling the speed of a fan. The main
advantage is that power loss in the switching device
is very low. When a switch is off, there is practically no
current, and when it is on, there is almost no voltage drop
across the switch. Therefore, power loss is close to zero.
PWM Saves Energy and Extends the Life of
Delta Fans
Deltas thermal technology continues to provide
better performance, high reliability, and cost-effective
thermal cooling solutions. PWM is one of the primary
reasons Delta fans have a clear advantage over other
manufacturers.
Delta carries a full line of PWM speed control fans
with dimension ranging from 36x36x28mm up to
280x280x162mm.
PWM Fan Curve Speed Characteristics Speed vs PWM Control Signal:
8000
(at rated voltage 48V; PWM signal with 3.3 VDC TTL;
Frequency: 2K Hz; Temperature: 25C)
7200
6800
Duty Cycle (%) Speed Current (A) Noise (dB-A)
6400
(RPM +/-10%)
5950
5600
100 6800 0.14 46.5
5100
4800
75 5950 0.09 43.5
4250
4000
50 5100 0.06 40.5
3400
3200
25 4250 0.03 36.5
2400
0 3400 0.02 32.0
1600
* Above referenced part number AFB0648EH-TP27
800
0
0 10 20 25 30 40 50 60 70 75 80 90 100
DUTY CYCLE (%)
2