FD128MX datasheet(9/11 Pages) FEELING

9 / 11 page

FD128MX/FD128NX

Technology

Single Phase Smart DC Motor Driver IC

This datasheet contains new product information. Feeling Technology reserves the rights to modify the product specification without notice.

No liability is assumed as a result of the use of this product. No rights under any patent accompany the sales of the product.

Rev0.6 Aug. 01, 2008

P.9

II.

PWM Control mode(Vset pin connect DC voltage)

When VSET is between VSL and VCPL. Then the output would are turn on at VSET <

V (CP) and turn off at VSET > V (CP). The CP frequency decided the Switch Period

and the result of VSET compared to V (CP) had the duty ratio.

III.

Full Speed Mode

When VSET is lower than VCPL, then the fan would enter the full speed mode.

IV.

Thermistor Mode

The VSET pin can use the Thermistor to produce the thermal control of system, and

saving the power around the room temperature.

External 25KHZ input control

The signal is suggested to send into CP. The result is similar as that VSET must be

left open to use the VSL. So, the input voltage must be over the VSL to turn on drivers.

VI.

Lock Mode

When the fan stop and the capacitor (CO) continue to be discharged until the VCOK

point. Then the fan should enter the lock mode to turn off the low-side drivers. This

action would save the power consumption and avoid the over-heating philosophy. It

would be released until the VCOL point. The rotation detect signal (RD) would set to

High at lock mode.

VII. Other

FD128MX Datasheet(PDF) 9 Page - Feeling Technology Corp.