Dass055 Hot 'link' -

Many versions of the DASS055 come in a package with an exposed pad that should be soldered to a PCB ground plane for heatsinking. However, cheaper clone modules omit proper thermal vias. Without a thermal path, the chip’s junction temperature can reach 110–125°C under a 3A continuous load.

| Load Current | Ambient Temp | Heatsinking | Typical Case Temp | Verdict | |--------------|--------------|-------------|-------------------|---------| | 0.5A | 25°C | None | 45–55°C | Cool | | 1.5A | 25°C | None | 65–75°C | Warm (normal) | | 3.0A | 25°C | None | 85–100°C | Hot (design limit) | | 3.0A | 25°C | PCB copper + vias | 70–80°C | Acceptable | | 4.0A (peak) | 40°C (enclosed) | Poor | 115°C+ (thermal shutdown) | Critical | dass055 hot