AH9486-WUF-7 Diodes Incorporated

AH9485/86 SINGLE PHASE LOW NOISE SMART MOTOR DRIVER Description Pin Assignments The AH9485 and AH9486 are single chip solutions for driving a single phase (coil) brushless DC motors. It integrates the motor driver and the high sensitivity Hall effect sensor to simplify the system circuit and (Top View) PCB design for simpler solutions. Pin 1 Mark Rotor lock-detect, shutdown and auto-restart functions help to prevent the motor from over-heating when rotor is locked and restarts the motor after the lock is removed. FG/RD 6 V 1 DD The AH9485 and AH9486 have built-in open drain tachometer frequency generator (FG) and rotation detection (RD) outputs to allow external interface to monitor motor rotation, speed or rotor locks GND 2 5 PWM conditions easily. The FG provides magnetic change frequency while the RD provides the rotor status. OUT1 3 4 OUT2 The full bridge output stage uses soft-switching technique to minimize the audible switching noise (vibration and acoustic noise) and electromagnetic interference (EMI) providing a low noise solution. TSOT26F Over-temperature shutdown provides thermal protection for the device. An external DC voltage or a PWM (pulse-width modulation) signal on the PWM pin can be used to control the motor speed. The AH9485 and AH9486 are packaged in TSOT26F. Applications Features 5V Low Noise BLDC Cooling Fans Low Voltage / Low Power BLDC Motors Internal Full Bridge Driver Notebook / VGA DC Fans / Blowers High Sensitivity Integrated Hall Sensor Micro-Motors Low and Wide Supply Voltage Range of 2V to 6V Soft Switching for Low Noise Rotor Lock Protection and Auto-Restart DC Voltage or PWM Signal Speed Control Thermal Protection Tachometer FG Output(AH9485) or Rotor Lock Alarm RD Output (AH9486) Operating Temperature Range of -40C to +105C Flat Pin TSOT26F 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 AH9485/86 Typical Applications Circuit (Note 4) R3 V PWM 1K W Schottky Diode 0.2V V DD D1 ZD1 R1 5.5V 4.7 W C1 2.2 mF/5.5V 5 4 6 AH9485/86 2 3 R2 1 5V 10K W R4 FG/RD 39 W Note 4: Must use C1 capacitor for the decoupling between V and GND and place the capacitor as close to the IC as possible. DD ZD1: V over-voltage stress protection diode. DD R2: current limit resistor for Open Drain RD output. R3: de-coupling resistor for long-distance signal transmission. Pin Descriptions Pin Number Pin Name Function 1 FG/RD FG(AH9485) or RD(AH9486) 2 GND Ground pin 3 OUT1 Output pin 1 4 OUT2 Output pin 2 5 PWM DC voltage or Pulse width modulation signal speed control pin 6 V Power supply pin DD 2 of 12 AH9485/86 September 2015 Diodes Incorporated www.diodes.com Document number: DS38108 Rev. 1 - 2 NEW PRODUCT FG/RD V DD PWM GND OUT1 OUT2