ZXBM2004Q16TC Diodes Incorporated

ZXBM2004 TWO PHASE VARIABLE SPEED MOTOR CONTROL PRE-DRIVER Description Pin Assignments The ZXBM2004 is a 2-phase, Brushless Direct Current (BLDC) (Top View ) motor control pre-driver with variable PWM speed control H+ 1 V CC suitable for fan and blower motors. H- V+OP For system flexibility, motor speed can be controlled by Ph1 N/C changing SPD pin voltage which can be either from Thermistor ThRef Ph2 network, external voltage or PWM signal. ZXBM2004 SPD N/C To help protect the motor coil, the ZXBM2004 provides Rotor C FG PWM Lock Protection which shuts down the output drive if rotor lock S RD MIN is detected. The device automatically re-starts when the rotor GND C lock is removed. LCK QSOP-16 A Tachometer output is provided by open-drain Frequency Generator (FG) Pin which allows external interface to monitor (Top View ) motor rotation or speed. The FG output is the magnetic change frequency. The ZXBM2004 is available in small space saving low profile NC Ph1 U-QFN3030-16 and QSOP-16 packages. ThRef Ph2 SPD NC C PWM FG Features U-QFN3030-16 Supports two-phase BLDC motor control Operating voltage: 4.7V to 18V Applications o Can be extended with external regulator Desktop PC and Servers fans and blowers PWM speed control via external Thermister, DC voltage or Instrumentation fans PWM signals Central heating blowers Reference voltage output Automotive instrument cooling and climate control Built-in Hall amplifier allows direct connection of Hall element Extractor fans Rotor Lock Protection (Lock detection, output shutdown General motors and pumps and automatic re-start) Rotor lock detect (RD) output Minimum speed setting Frequency generator (FG) output for speed measurements Low noise Space saving low profile U-QFN3030-16 and QSOP-16 packages Green Molding Compound 1 of 19 February 2012 ZXBM2004 Diodes Incorporated www.diodes.com Document number: DS33433 Rev. 5 - 2 NEW PRODUCT S MIN H- GND H+ C V LCK CC RD V+OPZXBM2004 TWO PHASE VARIABLE SPEED MOTOR CONTROL PRE-DRIVER Typical Application Circuit Pin Descriptions Pin Name Description H+ Hall input to non-inverting input of internal operational amplifier H- Hall input to inverting input of internal operational amplifier ThRef Reference output voltage Speed control pin The control signal voltage should be between 3V to 1V for 0% to 100% (full speed) SPD speed control PWM frequency setting pin: Connect a capacitor from this pin to ground (0V) to set PWM frequency. C PWM Capacitor of 0.1nF will give PWM frequency of 24kHz typical. Minimum speed setting pin: Voltage between 3V to 1V on this pin sets the minimum speed S between 0% to full speed. Lowest minimum speed achieved depends on the motor coil MIN design. GND Supply return ground pin Rotor lock detect and auto re-start timing pin: Connect a capacitor from this pin to ground to set the lock C LCK detect and restart timing. Rotor lock detect pin: Open collector output to indicate rotor lock detection RD Connect a pull-up resistor from the pin to the pull-up supply rail FG Frequency Generator output to provide a tachometer signal Phase-1 low-side external power switch drive output pin: Darlington emitter follower output with active Ph1 pull down to give source/sink current of 80mA/16mA Phase-2 low-side external power switch drive output pin: Darlington emitter follower output with active Ph2 pull down to give source/sink current of 80mA/16mA Phase output supply voltage pin: The pin allows to optimize the supply to output drive depending on V+OP whether external power switch is Bipolar switch or MOSFET V Power supply pin CC 2 of 19 February 2012 ZXBM2004 Diodes Incorporated www.diodes.com Document number: DS33433 Rev. 5 - 2 NEW PRODUCT