Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control

Version

：A.010

Page

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FD178A/FD178B/FD178C

General Specifications

Designed for rotation speed control of single coil DC brushless fans, the FD178

series motor drivers minimize external component count and integrate all the key features

required for high efficiency and low noise fans.

Specifically PWM control and soft

switching are provided to control the rotation speed and reduce the audible noise.

Internal circuit protection includes thermal shutdown with hysteresis, rotor lock protection,

and reverse power polarity protection. Three frequency generation (FGR pin) options are

provided for different fan configurations - FG (FGR signal following Hall sensor output

frequency), FG/2 (divided by two version of FG), and RD (rotation detection) for FD178A,

FD178B, and FD178C respectively.

Features and Benefits

Support single-phase full wave Brushless DC Motor Driver

Built-in Hall sensor input signal amplifier

PWM control circuit

Low voltage startup (VDD=2V)

High driving capability

Lock detection and automatic self-restart

Power polarity reverse protection

Thermal shut down protection circuit

Thin, compact, highly reliable package (TSOT-28)

Pin Description

FD178A/FD178B/FD178C：TSOT-28

Package : TSOT-28

NO.

NAME

DESCRIPTION

1

O1

Output driving & sinking pin 1

2

VSS

Ground pin

3

FGR

Frequency generator or rotating detector

FD178：FG

FD178B：FG/2

FD178C：RD

4

HP

Hall sensor in+

5

HN

Hall sensor in-

6

PWM

PWM control pin

7

VDD

Power supply pin

8

O2

Output driving & sinking pin 2

O1

O2

VSS

VDD

HN

HP

PWM

FGR

TSOT