FD128MX/FD128NX

Technology

Single Phase Smart DC Motor Driver IC

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Rev0.6 Aug. 01, 2008

P.1

General Description

The FD128 series is a direct PWM drive IC with single-phase and bipolar drive. The

IC is suitable for variable speed control Fan of PC.

Features

Single-phase coil driver, applied to fan or motor.

Lock function built-in and a lock detect output signal (RD).

Thermistor or PWM modes are available for speed control.

An external capacitor (CO) is necessary for lock function.

An external capacitor (CP = 47pf) for internal 25KHz saw-tooth wave

Thermal Shutdown built-in.

Hall IC input (INN) can use as rotation output (FG)

Internal minimum speed

Function Block Diagram

Lock Detect

Oscillation

Circuit

TSD

Regulator

Controller

CO

VDD

INN

VSET

CP

GND

NO

SO

VL

RD