Applications

Features

  • Variable speed control of 4-wire fans
  • Soft switching to reduce audible noise
  • Current limit & rotor lock protection
  • Separate tach and alarm pins
  • Both PWM & voltage control inputs
  • Integrated Hall amplifier and voltage bias
  • Available in a 14 lead SOIC RoHS compliant package

Description

Variable speed is adjusted by varying the duty cycle to the PWM control input pin. The analog control pin can be used to interface with a thermistor when the PWM input control is not needed. Rotor speed is reported on TACH. Rotor lock is reported on a separate ALARM pin.

Soft switching reduces audible noise. Current limit and thermal protections are also provided. The 40V MOS output predrivers can source or sink 100mA.

Open Loop Product Comparison

The AGV8010 series of open loop single phase pre-drivers offer a variety of feature combinations to meet different application needs. Product differences are summarized below.

Part # Seperate
Tach & Alarm
Tach &
Min Speed
Soft
Switching
AGV8011
AGV8012
AGV8018
AGV8019