wlpuah / RUMBA32 - History

Change bed MOSFET

Change bed MOSFET to same part as RUMBA+ (PSMN1R8).

Tidy BOM

Clean up part descriptions in Altium and regenerate BOM

Change Bed MOSFET

Change to SiSS10DN (PowerPAK 1212-8S package). Advantages compared to previous MOSFET:
- Lower RDSon at 4.5V: 3.0/3.6 vs 3.7/4.4
- Vgs can tolerate +20V, not just +10V (so 12V drive is an option)

v1.0B fixes

- Remap HEATER_BED_PIN to PWM capable pin
- Remap FAN_PIN to PWM capable pin
- Tidy labeling of stepper driver jumpers
- Change stepper driver voltage jumper to default to 3V (as per schematic)
- Add back in MOSFET driver voltage select, default to 5V
- Move 5V regulator voltage sense trace away from noise source under regulator IC
- Add pads for optional I2C EEPROM
- Add SMD test points for three unused STM32F4 pins
- General tidying of schematic and PCB routing

Update to v1.0B

Change bed MOSFET to BUK9Y4R4-40E
Remove jumper to select bed MOSFET driver voltage source, hardwired to 5V (BUK9Y4R4-40E has +/- 10V as maximum VGS, so 12V could be damaging).

Routing Done

Routing work finished and PCB tentatively ready for prototyping. Several schematic changes - mostly microcontroller pinout, but also changes to 12V regulator.

Ongoing PCB Work

Mainly power supply work