Preliminary Datasheet

Single Phase Full-wave Low Voltage Fan Motor Driver

AM9799

Jun. 2011

Rev. 1. 1

BCD Semiconductor Manufacturing Limited

6

H+

OUT1

OUT2

FG

TON

TOFF

Motor

Lock

Lock

Cancel

Reset

Motion

Ordinary

Thermal Shut Down (TSD)

This IC is built-in TSD. TSD has the temperature hysteresis.

Output

ON

Output

OFF

150ºc

175ºc

TSD

OFF

TSD

ON

TSD ON (Typ. 175

°C ) All output transistor OFF.

TSD OFF (Typ. 150

°C) Reset ordinary motion.

(It has the temperature hysteresis of 25

°C <TYP>)

Figure 5. Thermal Shut Down

Lock Detection, Automatic Restart Circuit

This IC detects the rotation of the motor by hall signal, and adjusts lock detection ON time (Ton) and lock

detection OFF time (Toff) by the internal counter. These time (Ton, Toff) are showed below.

Figure 6. The Function of Rotor-locked Protection and Auto Restart Diagram of AM9799