AH5773 SINGLE PHASE MOTOR DRIVER WITH INTERNAL HALL EFFECT LATCH SENSOR Description Pin Assignments The AH5773 is a high performance, single chip solution for driving single-coil brushless direct current (BLDC) fans and motors. The (Top View) integrated full-bridge driver output stage uses soft switching to minimize audible switching noise and electromagnetic interference (EMI) providing a low noise solution. 1 8 FG NC To simplify circuit design and minimize external components, the 2 7 NC PWM device integrates a stable high sensitivity Hall-effect sensor, voltage and temperature compensated internal references, amplifiers and the 3 6 O2 V DD output H-bridge power switches with low R . For system flexibility, DSON Pad the motor speed can be controlled by changing the duty ratio of the PWM signal at the PWM pin or adjusting the supply voltage. 4 5 GND O1 To help protect the motor coil, the AH5773 provides Rotor Lock Protection which shuts down the output drive if rotor lock is detected. MSOP-8EP The device automatically re-starts when the rotor lock is removed. In case of over-voltage, the device shuts down the output drive and enters standby mode to help prevent over-voltage stress on the coil. (Top View) Over-temperature shutdown provides thermal protection for the device. The device enters standby mode when PWM pin is pulled low PWM 1 6 FG for longer than 65ms. In standby mode, AH5773 consumes less than 100A. V 2 5 O1 DD A Tachometer output is provided by open-drain Frequency Generator 3 4 O2 Pad GND (FG) Pin which allows external interface to monitor motor rotation or speed. The FG output is the magnetic change frequency. U-DFN2020-6 The AH5773 is available in space saving small low profile U- DFN2020-6 and MSOP-8EP packages. Applications Features 5V/ 9V/ 12V/ 15V Min. BLDC Cooling Fans and Motors Supports Single-Phase Full Wave BLDC Fan/Motor Drive Netbook/ Notebook and Desktop BLDC Fans Wide Operating Voltage Range: 2.4V to 18V Instruments Cooling Fans Built-in High Sensitivity Hall Effect Sensor Medium Voltage/ Low Power BLDC Motors Built-in H-Bridge with Low R Resistance DSON PWM Input for Speed Control Standby Feature with I <100A DD Soft Switching for Low Noise DC Fan Motor Applications Rotor Lock Protection with Automatic Re-Start t Clear When PWM Is Low for Greater Than 65ms OFF Over Voltage Shutdown Thermal Protection Tachometer (FG) Output Small Low-Profile Package: U-DFN2020-6 and MSOP-8EP with Exposed Pads for Power Handling Capability 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 AH5773 Typical Applications Circuit Optional SYSTEM POWER D1 Dz 10kW V DD FG FG C1 PWM signal for PWM O1 AH5773 speed control Motor Coil O2 GND GND Notes: 4. C1 is for power stabilization and to strengthen the noise immunity the recommended value is 2.2F. The value of capacitor can be optimized depending on the operating mode, motor voltage and the motor current. For PWM speed control mode, with datasheet current capability, the recommended capacitor value is 2.2F, for lower motor current 1F and higher should be used. If PWM speed control function is not used (PWM pin tied high or not connected) the capacitor value can be reduced towards 0.1F. The value of the C1 should be checked in the motor design in its operating conditions if it is reduced from the recommended value of 2.2F. 5. The AH5773 has an open-drain tachometer FG output that follows the magnetic change frequency. Typically a pull-up resistor of 10k is recommended from FG pin to the supply voltage. Pin Descriptions Package Type: MSOP-8EP Pin Number Pin Name Description 1 FG Frequency Generator (FG) - The FG output is the same as the magnetic change frequency 2 PWM PWM signal input pin for speed control 3 O2 Output drive sourcing & sinking pin 4 GND Ground pin 5 O1 Output drive sourcing & sinking pin 6 V Power supply input pin DD 7 NC No connection (Note 6) 8 NC No connection (Note 6) Pad Pad Exposed pad for thermal dissipation. It can be connected to GND or left open circuit. Note: 6. NC is No Connectionp in and is not connected internally. This pin can be left open or tied to ground. Package Type: U-DFN2020-6 Pin Number Pin Name Description 1 PWM PWM signal input pin for speed control 2 V Power supply input pin DD 3 O2 Output drive sourcing & sinking pin 4 GND Ground pin 5 O1 Output drive sourcing & sinking pin 6 FG Frequency Generator (FG) - The FG output is the same as the magnetic change frequency Pad Pad Exposed pad for thermal dissipation. It can be connected to GND or left open circuit. 2 of 17 January 2015 AH5773 Diodes Incorporated www.diodes.com Document number: DS35444 Rev. 2 - 2 NEW PRODUCT