SDC280 datasheet(6/9 Pages) SDC

6 / 9 page

Datasheet

November, 2013 Rev. 1.1

6/9

2013 Shaoxing Devechip Microelectronics Co., Ltd.

www.sdc-semi.com

Smart Two-Phase DC Fan

SDC280

Power Dissipation Curve

100

125

150

100

200

300

400

500

600

PD(mW)

700

Ta(°C)

Figure 5. Power Dissipation Curve

Function Description

SDC280 is a single-chip integrated circuit that drives

two-phase brushless DC fan. It contains voltage regulator,

Hall voltage generator, chopper amplifier, hysteresis

comparator, oscillator, logic control unit, and output

high-voltage switch. After fan is powered on, the internal

oscillator begins to work, the output switching signal

begins to drive switches work in a certain delay, the fan is

started. The magnetic field signal is sensed by the internal

Hall-voltage generator to produce the Hall voltage,

through the chopper amplifier and hysteresis comparator,

to generate the alternating drive signal to drive switching

transistors alternately turn on the fan to finish booting.

When the fan is locked, the internal Hall sensor senses the

same signal and hysteresis comparator outputs fixed

signal. Through the logic controller and a certain delay, a

signal is generated to make the output switch off, fans are

protected. When locked condition is released, like the

start, the fan will be automatically restarted.

SDC

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SDC

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