LV 8729 Driver Module
โมดูลขับมอเตอร์ LV8729 Driver Module ขับกระแสต่อเนื่องที่ 0.8A สูงสุด 1.8A แรงดัน 12V สูงสุด 36V
product manual
LV8729 driver module, 128 subdivision, in order to meet the customer needs high subdivision drive, and developed ultra-quiet in-line driver module, the use method is simpler, is the best choice for the printer to create a quiet environment.
Product specification parameters
- Dimensions: 1.5mmx2.0mm (same as A4988 and DRV8825)
- Maximum drive current: 1.8A (factory default 0.8A)
- Maximum voltage: 36V (usually 12V)
- Support subdivision: 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128
- Product Process: Four-layer PCB board
- Delivery list: LV8729 module x 1, heat sink + sticker x1
- Product weight: 5g
Features
- In the 64 subdivision or 128 subdivision, you can have a better ultra-quiet effect;
- Working voltage: 6V-36V, the recommended voltage is 12V;
- The maximum current is 1.5A, the default is 0.8A;
- Subdivision: 1, 1/2, 1/4, 1/8, 1/16, 1/32, 1/64, 1/128;
- Heat sink must be added to make the heat dissipation better ( please use a large fan to assist in heat dissipation ).
Tip: Please confirm the direction before power-on, and the reverse will damage the chip.
Subdivision settings table:
The motherboard subdivision jumper caps are M1, M2, and M3 from left to right. The jumper cap is inserted as High, and the jumper cap is removed as Low. The specific settings are as follows:
After a long test, using 64 subdivisions works best.
Drive current algorithm and regulation
1. Drive current algorithm: i=Vref*0.9, the default Vref is about 1.3v, so the default current is 1.2A and the maximum current is 2A!
2. Vref measures the voltage of Gnd and the middle end of the potentiometer as shown in the figure below;
3. Do not connect the motor when measuring the voltage, otherwise it will easily burn the drive;
4. Turn on the power when measuring the voltage. Do not connect only to the USB power supply.
5. When adjusting the driving potentiometer, it is necessary to adjust the potentiometer with a small amplitude. After the measurement, adjust it again to avoid the current being too large and causing the drive to burn out;
6. Clockwise adjustment is increased, counterclockwise adjustment is reduced;
LV8729 enhanced cooling tips:
In order to consider the heat problem, LV8729 uses a four-layer PCB to dissipate heat. At the same time, the chip has a heat sink attached to it. The factory default 1A drive current. Due to the large number of subdivisions of the LV8729 driver , any motor drive module is used for the stable operation of the 3D printer. It is necessary to actively dissipate heat, such as installing a fan, hanging a heat sink, and running a large fan to the motherboard.