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STD Lepton Deku mod BLDC SimpleFOC Driver

License: CERN Open Hardware License

Mode: Editors' pick

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Update time: 2024-03-06 09:13:51
Creation time: 2022-10-12 05:15:49
Description

https://oshwlab.com/cost.co/20220903_bldc_se3082g

https://community.simplefoc.com/t/lepton-v2-revised-design-tested-working-30v-80a-mosfets/2489

 

DISCLAIMER: I am a monkey and I have no idea what I'm doing.

 

Changes:

1) Size reduced from 30x40mm to 25x25mm

2) Exposed copper along + and - rails on back of board, so heavier conductors can be added

3) Changed motor wire holes to solder pads, to reduce size and so the wires connect directly to the MOSFET pins.

4) Removed the 5 ceramic capacitors from upper right (I will hand solder up to 12 of them on the back side instead, or just use a larger electrolytic)

5) Reworked the connectors (see note 1)

6) Removed the 12V buck converter (see note 2)

7) Removed the reset button (reset pin is still accessible via the programming connector)

8) Changed UART_RX from pin 22 to pin 8 to help with routing.

9) Replaced the 22uF 1206 capacitor with two 10uF 0603, and replaced the lower voltage 22uF 0603 with 10uF to reduce unique part count and because it's what the LDO datasheet recommends.

 

 

Note 1: There is now one 9 pin 1.25mm pitch connecter used during programming, one 6 pin for the encoder, and four 2mm pitch holes/pins for power and I2C communication in final application. The connectors are right-angle type, to allow stacking boards to save space and share a single cooling fan, and the power and communication wires can be passed axially through the stack.

 

The encoder connector is designed so you can use an SPI encoder, 3 digital hall sensors, or 2 linear hall sensors as described here https://community.simplefoc.com/t/40-cent-magnetic-angle-sensing-technique/1959

However the digital halls need higher than 3.3V power while other encoders need lower than 12V, so I had to add a solder jumper to select which voltage rail to connect to the power pin.

 

 

Note 2: My primary reason for removing the buck converter is that I will be running 8 motors on 3 cell lipo, so that would be a lot of wasted space and components when I can use the main voltage directly. There are several options for the mid-voltage power now, so I renamed it to VCC instead of 12V. The gate driver chip can use 5V to 20V, and the 3.3V regulator may overheat above 12V, so 5V to 12V is the usable range. Higher is better because the MOSFETs need 10V to fully open (5mOhm, versus 7.5mOhm at 4.5V), but it is nice that the 5V from standard radio control equipment, Arduino or USB can be used, or 7.4V from 2 cell lipo.

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ID Name Designator Footprint Quantity Manufacturer Part Manufacturer Supplier JLCPCB Part Class spiceSymbolName Contributor
1 470nF C5,C8,C9 C0603 3 CL10B474KA8NNNC SAMSUNG LCSC C1623 Basic Part CL10B474KA8NNNC
2 100nF C6,C12,C13 C0402 3 CL05B104KB54PNC Samsung Electro-Mechanics LCSC C307331 Basic Part CL05B104KB54PNC LCSC
3 10uF C7,C11,C14 C0603 3 CL10A106MA8NRNC SAMSUNG LCSC C96446 Basic Part CL10A106MA8NRNC
4 X9821WR-06-N0SN CN1 CONN-TH_6P-P1.25_L4.7-W9.3 1 X9821WR-06-N0SN XKB Enterprise LCSC C519006 Extended Part X9821WR-06-N0SN LCSC
5 X9821WR-09-N0SN CN2 CONN-TH_9P-P1.25_L4.7-W13.0 1 X9821WR-09-N0SN XKB Enterprise LCSC C519009 Extended Part X9821WR-09-N0SN LCSC
6 1N5819WS D3,D6,D7 SOD-323_L1.8-W1.3-LS2.5-RD 3 1N5819WS Guangdong Hottech LCSC C191023 Basic Part 1N5819WS LCSC
7 SE3082G Q1,Q2,Q3 DFN-8_L5.5-W5.2-P1.27-LS6.0-BL-EP2 3 SE3082G SINO-IC LCSC C238670 Extended Part SE3082G LCSC
8 FD6288Q_C328453 U1 QFN-24_L4.0-W4.0-P0.50-BL-EP2.6 1 FD6288Q Fortior Tech LCSC C328453 Extended Part FD6288Q_C328453 LCSC
9 STM32G031G8U6 U2 UFQFPN-28_L4.0-W4.0-P0.50-BL 1 STM32G031G8U6 STMicroelectronics LCSC C432211 Extended Part STM32G031G8U6 LCSC
10 HT7533-1_C14289 U3 SOT-89-3_L4.5-W2.5-P1.50-LS4.2-BR 1 HT7533-1 HOLTEK LCSC C14289 Basic Part HT7533-1_C14289

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