BLDC motors are widely used in cooling fans for various information equipment, office automation, factory automation, household appliances, and other products. To make these fans run stably and efficiently, it is necessary to adjust the operation characteristics of different fans. In view of the demand, onsemi has developed BLDC motor drivers that can save the operation settings of the motor. This article will introduce the functional characteristics of these products for you.
Heat dissipation is the key to the stable operation of electronic products
The reason for the failure of many electronic products is often that the cooling fan stops running, although the cooling fan used in many electronic products is an inconspicuous accessory, which leads to poor cooling of the machine and overheating of the whole system, which plays a more and more important role when the operating frequency of many electronic products gets higher and higher and the temperature of the machine is soaring rapidly.
When the cooling fan is in operation, according to different fan types, motor speed, soft start setting, lead angle, soft switch width, locking protection time, FG/RD/RDA signal output, CLM (Current Limiter)/OCP (Overcurrent Protection), TSD (Thermal Shutdown), UVLO (Under Voltage Lock Out) and other parameters are different, so it is necessary to set and adjust for different fans. In view of this demand, onsemi introduced a motor driver that can store parameters in nonvolatile memory (NVM), NVM in order to improve the efficiency and stability of cooling fans. The following will introduce the product features of three onsemi BLDC motor drivers.
12V, 24V, and 48V single-phase BLDC motor pre-driver with speed control
The LV8310H is a pre-driver for 12V, 24V, and 48V single-phase BLDC motors, which uses an internal closed-loop speed controller to control the motor speed. The target speed can be set by inputting the PWM duty cycle, and the speed curve setting can be stored in the internal NVM. In addition, the lead angle can be adjusted by the configuration stored in the internal NVM, so various motors can be driven with high energy efficiency and low noise.
LV8310H (Package: TSSOP−16)
The LV8310H supports the driver output of an external power FET (P-MOS high side, N-MOS low side), with optional high-side gate driver polarity, one for 12V motor voltage and the other for 24V/48V motor voltage, with an external level shifter FET. It supports PI closed-loop speed control function, single-phase full-wave driver, PWM duty cycle input (25 Hz to 100 kHz), soft start function, PWM soft switching phase transitions and built-in current limiting function and overcurrent protection.
The LV8310H has a built-in thermal protection function, rotor locking protection, and automatic recovery function. FG or RD signal output can be selected, the lead angle can be dynamically adjusted according to the input duty cycle, the parameters can be set through serial communication, an embedded EEPROM is used as the NVM, the NVM is used for parameter setting, and the device is Pb-free and halogen-free. Typical applications include cooling fans for telecom servers and base stations, cooling fans for desktop computers, cooling fans for servers, circulating fans for refrigerators, cooling fans for electrical appliances, cooling fans for power equipment, etc.
Single-phase PWM full wave BLDC motor driver
The LV8316H is a driver for a single-phase BLDC motor, which directly controls the motor speed through a PWM duty cycle input, and it can control the motor under the condition of low fluctuation and low noise. In addition, it can adjust the configuration of the lead angle by using the value stored in the internal NVM so it can drive various motors with high energy efficiency and low noise, and the motor speed control curve can also be stored by the NVM.
LV8316H (Package: TSSOP−14)
The LV8316H is a single-phase full-wave fan motor driver with a Iomax of 2.0 A, which supports PWM duty cycle input (25 Hz to 100 kHz), PI closed-loop speed control function, soft start function, PWM soft switching phase transitions and an embedded current sense resistor.
The LV8316H has a built-in thermal protection function, rotor locking protection, and automatic recovery function. FG or RD signal output is optional. It supports dynamic lead angle adjustment relative to the rotating speed, and can set parameters through serial communication. An embedded EEPROM is used as the NVM, and an NVM is used for parameter setting. It is a Pb-free and halogen-free device. Typical applications include cooling fans for telecom servers and base stations, cooling fans for desktop computers, cooling fans for servers, circulating fans for refrigerators, cooling fans for electrical appliances, and cooling fans for power supplies.
24V single-phase BLDC motor driver
The LV8324C is a 24V single-phase BLDC motor driver, and its target output duty cycle can be set by inputting a PWM duty cycle. Output duty cycle curve settings can be stored in the internal NVM. In addition, the lead angle can be adjusted by the configuration saved in the internal NVM, therefore, it can drive various motors with high efficiency and low noise.
Demo board of LV8316H
The LV8324C can choose either soft start or a direct output PWM duty cycle control at startup, with power-on delay function (programmable ignoring time of the PWM input), single-phase full-wave driver with open-loop output duty cycle control, embedded power FET, Iomax [peak] of 1.0 A, PWM duty cycle input of 25 Hz to 80 kHz, supports PWM soft switching phase transitions, soft PWM duty cycle transitions (gradually changing target output-duty cycle), built-in current limiting function and over current protection.
The LV8324C has a built-in thermal protection function, rotor locking protection, and automatic recovery function. FG, RD, or RDA signal output is optional. It can adjust the dynamic lead angle relative to the rotating speed, and set parameters through serial communication. An embedded EEPROM is used as the NVM, and an NVM is used for parameter setting. This device is Pb-free and halogen-free, and is typically used as fan motor in factory automation.
Conclusion
Cooling fans are used in many electronic products, and play a key role in the stability of the system. BLDC motor drivers that can store parameter settings in an NVM are good partners for cooling fans, which can make the fans run with high efficiency and low noise. These BLDC motor drivers from onsemi will be the best choice for designing cooling fans.
