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
z Support single-phase full wave Brushless DC Motor Driver
z Built-in Hall sensor input signal amplifier
z PWM control circuit
z Low voltage startup (VDD=2V)
z High driving capability
z Lock detection and automatic self-restart
z Power polarity reverse protection
z Thermal shut down protection circuit
z Thin, compact, highly reliable package (TSOT-28)
Pin Description
FD178A/FD178B/FD178C：TSOT-28
O1
VSS
FGR
HP
TSOT
O2
VDD
PWM
HN
Package : TSOT-28
NO. NAME
DESCRIPTION
1 O1 Output driving & sinking pin 1
2 VSS Ground pin
Frequency generator or rotating detector
FD178：FG
3 FGR 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
Single Coil Brushless DC Motor Drivers with Soft-Switching and PWM control Version：A.010
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