双线圈带卡堵保护自启动霍尔芯片规格书9.pdf

  DS-284-EN rev1.0 crossMAG series   CCH284 500mA Smart Fan Driver with Embeded Hall-Effect Sensor General Description CCH284 is a single-chip solution for driving two-coil brushless DC fans and motors. Based on BiCMOS process, CCH284 includes a Hall-effect sensor, dynamic offset correction and two complementary open-drain output drivers with internal zener diode clamp protection to prevent over voltage damage caused by back EMF. CCH284 provides Rotor Lock Protection which shut down output drivers if rotor lock is detected to help protect the motor coils. CCH284 is available in TO-94 and SOT-89-5L packages. Both TO-94 and SOT-89-5L are ROHS compliant. The normal operation temperature range is -40~85°C Features and Benefits Application Examples Fan operating voltage can be up to 20V 5V/12V DC brushless motor/fan Low cost 2-coil fan driver PC, server, laptop cooling fan High sensitivity integrated Hall Sensor Low to medium voltage, low power Low start up supply voltage, 2.8V typical BLDC motors Rotor Lock Protection and Auto Restart Average output current can be up to 500mA Peak output current can be up to 1A Built-in output protection clamping diode Block Diagram