[方案]STL6235三相BLDC马达DMOS驱动方案

ST公司的l6235是集成了过流掩护的3相DMOS马达驱动器,包罗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,具有多种掩护功能.本文先容了l6235主要特点,框架图,应用电路图和应用电路质料清单,三相BLDC马达驱动板EVAL6235PD主要特点,电路图,质料清单和PCB设计原理图.

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主要特点:

 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框架图

图2.L6235应用电路图
L6235应用电路图质料清单:

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主要特点:

Operating supply voltage from 8 V to 52 V
5.6 A output peak current (2.8 A_RMS)
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质料清单:


图5.马达驱动板EVAL6235PD PCB元件结构图(顶层)

图6.马达驱动板EVAL6235PD PCB设计原理图(顶层)

图7.马达驱动板EVAL6235PD PCB设计原理图(底层)
详情请复制打开此衔接地址:
http://www.st.com/st-web-ui/static/active/en/resource/technical/document/datasheet/CD00002347.pdf
和http://www.st.com/st-web-ui/static/active/en/resource/technical/document/data_brief/DM00036674.pdf
以及http://www.st.com/st-web-ui/static/active/en/resource/technical/layouts_and_diagrams/schematic_pack/eval6235pd_schematic.pdf

CD00002347.pdf
DM00036674.pdf
eval6235pd_schematic.pdf
eval6235pd-bom.pdf