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| L6235 三相BLDC马达DMOS驱动方案 |
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| 文章来源： 更新时间：2015/9/30 9:03:00 |
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ST公司的L6235是集成了过流保护的3相DMOS马达驱动器,包括3相DMOS桥,常关时间PWM电流控制器和用来驱动单端霍尔传感器的译码逻辑,工作电压8-52V,输出峰值电流5.6A,工作频率高达100kHz,具有多种保护功能.本文介绍了L6235主要特性,框图,应用电路图和应用电路材料清单,三相BLDC马达驱动板EVAL6235PD主要特性,电路图,材料清单和PCB设计图.
The L6235 device is a DMOS fully integrated3-phase motor driver with overcurrent protection.Realized in BCD technology, the device combinesisolated DMOS power transistors with CMOS andbipolar circuits on the same chip.
The device includes all the circuitry needed todrive a 3-phase BLDC motor including: a 3-phaseDMOS bridge, a constant off time PWM currentcontroller and the decoding logic for single endedhall sensors that generates the requiredsequence for the power stage.Available in PowerDIP24 (20 + 2 + 2),PowerSO36 and SO24 (20 + 2 + 2) packages, the L6235 device features a non-dissipativeovercurrent protection on the high-side power MOSFETs and thermal shutdown.
L6235主要特性:
Operating supply voltage from 8 to 52 V
5.6 A output peak current (2.8 A DC)
RDS(ON) 0.3 typ. value at Tj = 25 ℃
Operating frequency up to 100 KHz
Non-dissipative overcurrent detection andprotection
Diagnostic output
Constant tOFF PWM current controller
Slow decay synchr. rectification
60° and 120° hall effect decoding logic
Brake function
Tachometer output for speed loop
Cross conduction protection
Thermal shutdown
Undervoltage lockout
Integrated fast freewheeling diodes
图1.L6235框图
图2.L6235应用电路图
L6235应用电路图材料清单:
三相BLDC马达驱动板EVAL6235PD
The EVAL6235PD demonstration board is a fully integrated DMOS three-phase brushless DC motor driver.
Used in conjunction with the EVALPRACTISPIN interface board and practiSPIN software, the board provides an evaluation platform to test the features of the L6235 device. In particular, the board provides a means to evaluate the power dissipation performance of the IC in the PowerSO package.
An example of speed loop is implemented. The speed information is obtained by analog integration of the TACHO output. Fine tuning of external components is needed to fit application requirements.
The board is designed with a large GND area to minimize noise and optimize power dissipation.
马达驱动板EVAL6235PD主要特性:
Operating supply voltage from 8 V to 52 V
5.6 A output peak current (2.8 ARMS)
Operating frequency up to 100 kHz
Non-dissipative overcurrent protection
Constant off-time PWM current controller
60° and 120° Hall effect decoding logic
Brake function
TACHO output for speed loop
Suitable for EVALPRACTISPIN control
Capable of running in stand-alone mode
图3.马达驱动板EVAL6235PD外形图
图4.马达驱动板EVAL6235PD电路图
马达驱动板EVAL6235PD材料清单:
图5.马达驱动板EVAL6235PD PCB元件布局图(顶层)
图6.马达驱动板EVAL6235PD PCB设计图(顶层)
图7.马达驱动板EVAL6235PD PCB设计图(底层)
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