AH5772 SINGLE PHASE MOTOR DRIVER WITH INTERNAL HALL EFFECT LATCH SENSOR Description Pin Assignments The AH5772 is a single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The integrated full-bridge driver output stage uses soft switching to minimize audible switching (Front View) 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 output H-bridge power switches with low R . DSON 1. V DD To help protect the motor coil, the AH5772 provides Rotor Lock 2. O1 Protection which shuts down the output drive if rotor lock is detected. 3. O2 The device automatically re-starts when the rotor lock is removed. In 4. GND case of over voltage, the device shuts down the output drive and enters standby mode to help prevent over voltage stress on the coil. Over temperature shutdown provides thermal protection for the device. 1 22 33 44 The AH5772 is available in industry standard TO94 package. TO94 Features Applications Supports Single-phase Full Wave BLDC Fan/Motor Drive 5V / 9V / 12V / 15V Min. BLDC Cooling Fans Wide Operating Voltage Range: 2.4V to 18V Netbook/ Notebook and Desktop BLDC Fans Built-in High Sensitivity Hall Effect Sensor Instruments Cooling Fans Very Low Temperature and Voltage Coefficient of the Medium Voltage/ Low Power BLDC Motors Magnetic Operating Switch Points Built-in H-Bridge with Low R Resistance DSON Soft Switching for Low Noise DC Fan Motor Applications Rotor Lock Protection (Lock Detection, Output Shutdown and Automatic Re-start) Over Voltage 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 AH5772 Typical Applications Circuit Optional SYSTEM V DD POWER D1 C1 O1 Dz Motor Coil AH5772 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. The value of C1 should be selected adequately to support the motor current. 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 1 Lock Detect, Power Over Voltage V Shutdown and DD Management Protection Automatic Re-Start 2 O1 Dynamic Soft Hall Full Bridge Offset Control Switching AMP Sensor Driver Concellation Logic Control Block 4 3 Temperature O2 GND and Voltage Compensated Thermal Reference Shutdown 2 of 12 AH5772 September 2014 Diodes Incorporated www.diodes.com Document number: DS35442 Rev. 1 - 2 NEW PRODUCT