Diodes AM9800 - Manual

Data Sheet
Three Phase Direct PWM Sensorless Motor Driver AM9800
Sep. 2012 Rev. 1. 0 BCD Semiconductor Manufacturing Limited
1
General Description
The AM9800 is a direct PWM driver IC designed for
three-phase brushless motors. Also, by using highly
silent PWM drive, switching current of the phase
with a smooth slope reduces the sound of slewing
motor, and makes high-efficiency drive a reality by a
synchronous commutation.
The device is build-in lock protection. When the fan
is locked, the device will enter the lockup protection
mode. It is also equipped with thermal shutdown
function and forward or reverse rotation selection. In
normal operation, supply current is less than 2mA,
but in PWM=0 mode it is just around 20
µA.
The AM9800 is available in SSOP-16 package.
Features
•
Speed Controllable by PWM Input Signal
• Sensorless Drive
• Soft Switched Drive
• Build-in Forward/Reverse Switching Circuit
• Power Saving Function in a Stopped State: 2mA
and PWM=0 State: 20
µA
• Build-in Current Limiter Circuit
• Build-in Lock Protection and Auto-restart
• Built-in Over Current Protection
• Built-in Thermal Shutdown Circuit
• ESD Rating: 4000V (Human Body Model)
300V (Machine Model)
Applications
• CPU Cooler Fan in Notebook Personal
Computers
Figure 1. Package Type of AM9800
SSOP-16