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BLDC Motor Driver - manton. Description. This is a three phase brushless motor driver board based on the ST L6. PD driver IC. It consists of 3 high power half- bridges that can output up to 5.
A peak, or 4. A continuous (depending on heatsink). It has been designed with a large copper ground plane on the bottom that functions as a heatsink. If the driver IC heatsinking requirements can not be met by the copper layer alone, the bottom of the board could be fastened to an external heatsink. There is circuitry on board to amplify the winding current, and for sensing the back EMF voltage to assist in commutation. Note that this driver does not work standalone, and requires a microcontroller to at least output 3 PWM signals, and 3 enable signals, in the proper sequence to make the motor run.
Features. 3 half bridge drive channels. A continuous, 5. A peak output current. Input voltage range: 7- 1. V (limited by the voltage of the input capacitors)Back EMF sense, and reference resistor dividers. Very low ESR capacitors are used on the power supply rail to handle the high ripple current that is to be expected when driving a high current motor.
Winding current sense resistor, with amplifier to boost the output signal. Optional current recirculating diodes to increase efficiency. ESD protection on all microcontroller I/Os. Driver die has good thermal coupling to PCB copper layers (this may make hand soldering of the driver IC very difficult)0.
This company is fine to deal with, but shipping took a really long time. Assembly of the first board has been completed. The board was soldered in a reflow oven at a client's site. The board has been powered up, and has been used to drive a number of different BLDC motors, and so far, everything works as expected. For the moment, the commutation has been implemented without any feedback, and just run open loop. It is unknown as to whether or not the current monitoring, or back EMF monitoring will work as intended. As the software and testing proceeds, there may be some changes to various component values.
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This site will be updated when there is something to add. Documentation. For starters, you might find this datasheet useful to describe the operation of the driver IC used: L6. Three Phase Motor Driver datasheet. The source archive for the current PCB and schematic revision can be found here: BLDC Motor Driver V1. The schematic was drawn using Or.
CAD 1. 0. 5, and the PCB was done in P- CAD 2. This may make it difficult for others to edit the files, but gerber files are provided in the source archive so that one can have boards manufactured. Also included in the archive are schematic and PCB plots in PDF format, and a bill of materials file so that there is enough information to be able to populate a board. Here are some screen captures of the schematic and PCB layout (with links to PDF files): Bill Of Materials. Item. Qty. Reference. Description. 18. C1, C3, C8, C1. C1. 2, C1. 4, C1.
C1. 61. 0n 5. 0V 0. Ceramic Capacitor. C2. 1u. 0 2. 5V 0. Ceramic Capacitor. C4, C6, C7, C9, C1. V 0. 80. 5 Ceramic Capacitor.
C5, C1. 01. 00u 1. V Electrolytic Capacitor (Nippon Chemi- Con APXE1. ARA1. 01. MF8. 0G or Wurth 8. D1, D3, D5, D8. MMBZ1. VALT1 1. 5V SOT2. Zener Diode. 61. D2. MMBD7. 00. 0LT1 SOT2.
Diode. 73. D4, D6, D7. MBRS5. 40. T3 5. A 4.
V SMC Schottky Diode (optional)8. HD1. MKDSN 1. 5/2- 5. AMP 2. 82. 83. 7- 2 (use only one of HD1, or HD3)9.
HD2. 2x. 7 SMT Header (or through hole) (Samtec HTST- 1. L- DV or HTST- 1. L- DV- A)1. 01. HD3. MOLEX 2. 6- 6. 0- 4. Download Engineering Electromagnetics William Hayt 7Th Edition. HD1, or HD3)1. 11.
HD4. MOLEX 2. 6- 6. HD4, or HD5)1. 21. HD5. MKDSN 1. 5/3- 5.
AMP 2. 82. 83. 7- 3 (use only one of HD4, or HD5)1. R1, R2, R3, R5, R6, R7, R1. R2. 0, R2. 1, R2. K0 1% 1/8. W 0. 80. Thick Film Resistor. R4, R1. 1, R2. 3, R2.
R2. 53. 0K1 1% 1/8. W 0. 80. 5 Thick Film Resistor. R8, R9, R1. 0, R1. R1. 3, R1. 4, R1. R1. 6, R1. 71. K0. W 0. 80. 5 Thick Film Resistor. R1. 80. R0. 2 1% 3.
W 2. 51. 2 Metal Film Resistor (Bourns CRA2. FZ- R0. 20. ELF)1. TP1, TP2, TP3, TP4, TP5, TP6, TP7, TP8, TP9, TP1. TP1. 1, TP1. 2, TP1. TP1. 4, TP1. 5Test Point (not used)1. U1. L6. 23. 4PD Power. SO2. 0 Three Phase Motor Driver.
U2. TLV2. 71. ID SO8 Single Op Amp. Revisions. V1. 1.
Pin 7 on HD2 is now connected to +Vin, rather than ground like in the previous versions. This allows a microcontroller board to be powered from HD2, rather than requiring it to be connected to the power supply elsewhere. Source: BLDC Motor Driver V1.
V1. 0. 1Corrects the labels for Ph. Ph. 3 which were interchanged on the V1. PCB silkscreen layers.