AH5775 SINGLE PHASE MOTOR DRIVER WITH INTERNAL HALL EFFECT LATCH SENSOR Description Pin Assignments The AH5775 is a single-chip solution for driving single-coil brushless (Front View) direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low-noise solution. To simplify system circuit and minimize external components, the device integrates a stable high-sensitivity Hall effect sensor, voltage and temperature compensated internal references, amplifiers and the 1. V DD output H-bridge power switches with low R DSON. 2. O1 3. O2 To help protect the motor coil, the AH5775 provides Rotor Lock 4. GND Protection which shuts down the output drive if rotor lock is detected. The device automatically re-starts when the rotor lock is removed. In case of overvoltage, the device shuts down the output drive and enters standby mode to help prevent overvoltage stress on the coil. 1 22 33 44 Over-temperature shutdown provides thermal protection for the TO94 device. The AH5775 is available in TO94 package. Features Applications Supports single-phase full wave BLDC fan/motor drive 5V / 12V / 15V Min. BLDC Cooling Fans Built-in Hall effect sensor and input amplifier Netbook/ Notebook and Desktop BLDC fans Operating voltage: 2.5V to 18V Instruments Cooling Fans Soft switching for low noise DC fan motor applications Medium Voltage/ Low Power BLDC Motors Rotor Lock Protection (Lock detection, output shutdown and automatic restart) Overvoltage shutdown Thermal protection No external timing capacitor - Reduces the numbers of external components required Industry Standard TO94 Package Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2) Halogen and Antimony Free. Green Device (Note 3 ) Notes: 1. No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant. 2. See AH5775 Typical Applications Circuit (Notes 4) Optional SYSTEM V DD POWER D1 C1 O1 Dz Motor Coil AH5775 O2 GND GND Note: 4. C1 is for power stabilization and to strengthen the noise immunity, the recommended capacitance is 0.1F for small motor current to 1F or higher for larger motor current and place capacitor as close to the V pin as possible. The value of C1 should be selected adequately to support the motor current. DD Pin Descriptions Pin Number Pin Name Description 1 V Power supply input pin DD 2 O1 Output drive sourcing & sinking pin 3 O2 Output drive sourcing & sinking pin 4 GND Ground pin Functional Block Diagram Lock Detect, 1 Power V DD Shutdown and Management Automatic Re-Start 2 O1 Dynamic Soft Hall Full Bridge Control Offset Switching AMP Sensor Driver Concellation Logic Control Block 4 3 O2 GND 2 of 12 AH5775 December 2015 Diodes Incorporated www.diodes.com Document number: DS38232 Rev. 1 - 2 PRELIMINARY - CONFIDENTIAL