Mermaid:Mechanic L1 Pro Failure Sequence: Difference between revisions
Jump to navigation
Jump to search
Polymorphic7 (talk | contribs) mNo edit summary |
Polymorphic7 (talk | contribs) m resized |
||
| Line 1: | Line 1: | ||
%%{init: {'theme':'default', 'sequence': {'width': 50, 'height': 30, 'actorMargin': 20, 'boxMargin': 5, 'messageFontSize': 10, 'noteFontSize': 10}}}%% | |||
sequenceDiagram | sequenceDiagram | ||
participant User | participant User | ||
Latest revision as of 22:01, 9 September 2026
%%{init: {'theme':'default', 'sequence': {'width': 50, 'height': 30, 'actorMargin': 20, 'boxMargin': 5, 'messageFontSize': 10, 'noteFontSize': 10}}}%%
sequenceDiagram
participant User
participant PowerButton
participant QX9920
participant Q1
participant LED
User->>PowerButton: Turns lamp ON directly
Note over PowerButton,QX9920: Timer bypassed -<br/>no auto cutoff<br/>scheduled
PowerButton->>QX9920: VIN applied, EN held<br/>high continuously
QX9920->>Q1: DRV switches gate<br/>at full duty
Q1->>LED: Sustained drive<br/>current, no rest
loop Extended runtime,<br/>no shutoff
Q1->>Q1: Conduction + switching<br/>losses generate heat
Note over Q1: Heat dissipation<br/>can't keep pace
end
Note over Q1: Junction temp exceeds<br/>rated max
Q1-->>Q1: Thermal failure -<br/>commonly fails shorted D-S
Q1->>LED: Uncontrolled current -<br/>CS feedback no longer limits
Note over LED: LED experiences<br/>overcurrent stress
%%{init: {'theme':'default', 'sequence': {'width': 50, 'height': 30, 'actorMargin': 20, 'boxMargin': 5, 'messageFontSize': 10, 'noteFontSize': 10}}}%%
sequenceDiagram
participant User
participant PowerButton
participant QX9920
participant Q1
participant LED
User->>PowerButton: Turns lamp ON directly
Note over PowerButton,QX9920: Timer bypassed -<br/>no auto cutoff<br/>scheduled
PowerButton->>QX9920: VIN applied, EN held<br/>high continuously
QX9920->>Q1: DRV switches gate<br/>at full duty
Q1->>LED: Sustained drive<br/>current, no rest
loop Extended runtime,<br/>no shutoff
Q1->>Q1: Conduction + switching<br/>losses generate heat
Note over Q1: Heat dissipation<br/>can't keep pace
end
Note over Q1: Junction temp exceeds<br/>rated max
Q1-->>Q1: Thermal failure -<br/>commonly fails shorted D-S
Q1->>LED: Uncontrolled current -<br/>CS feedback no longer limits
Note over LED: LED experiences<br/>overcurrent stress