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4931

更新时间： 2024-09-17 00:04:35
品牌 Logo 应用领域
急速微 - ALLEGRO 驱动器
页数 文件大小 规格书
9页 299K
描述
3-Phase Brushless DC Motor Pre-Driver

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4931 数据手册

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A4931  
3-Phase Brushless DC Motor Pre-Driver  
Features and Benefits  
▪ Drives 6 N-channel MOSFETs  
Description  
TheA4931isacomplete3-phasebrushlessDCmotorpre-driver.  
▪ Synchronous rectification for low power dissipation  
▪ Internal UVLO and thermal shutdown circuitry  
▪ Hall element inputs  
The device is capable of driving a wide range of N-channel  
power MOSFETs and can support motor supply voltages up to  
30 V. Commutation logic is determined by three Hall-element  
inputs spaced at 120°.  
▪ PWM current limiting  
▪ Dead time protection  
▪ FG outputs  
▪ Standby mode  
▪ Lock detect protection  
Other features include fixed off-time pulse width modulation  
(PWM)currentcontrolforlimitinginrushcurrent,locked-rotor  
protectionwithadjustabledelay,thermalshutdown,overvoltage  
monitor, and synchronous rectification. Internal synchronous  
rectification reduces power dissipation by turning on the  
appropriate MOSFETs during current decay, thus shorting  
the body diode with the low RDS(on) MOSFET. Overvoltage  
protection disables synchronous rectification when the motor  
pumps the supply voltage beyond the overvoltage threshold  
during current recirculation.  
▪ Overvoltage protection  
Package: 28-contact QFN (ET package)  
The A4931 offers enable, direction, and brake inputs that can  
control current using either phase or enable chopping. Logic  
outputs FG1 and FG2 can be used to accurately measure motor  
rotation. Output signals toggle state during Hall transitions,  
providing an accurate speed output to a microcontroller or  
speed control circuit.  
Approximate Scale 1:1  
Operating temperature range is –20°C to 105°C. The A4931  
is supplied in a 5 mm × 5 mm, 28-terminal QFN package with  
exposed thermal pad. This small footprint package is lead (Pb)  
free with 100% matte tin leadframe plating.  
Typical Application  
0.1 μF  
0.1 μF  
0.1 μF  
0.1 μF 2 kΩ  
CLD HBIAS CP1 CP2 VCP  
VBB  
GHA  
VIN  
VIN  
SA  
FG1  
A4931  
FG2  
M
GLA  
System  
Control  
Logic  
GHB  
SB  
GLB  
BRAKEZ  
ENABLE  
DIR  
GHC  
SC  
GLC  
SENSE  
GND  
HA+ HA– HB+ HB– HC+ HC–  
4931-DS, Rev. 2  
1234567...9

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