Fixed-current, hardware-permitted PWM driver study for an ams OSRAM PLPT5 447KA 445 nm laser diode. The prototype commands approximately 0.849 A; the historical 2.5 W aspiration is not an achieved optical rating. Current evaluation is restricted to a dummy load.
Second-round candidate accepted for engineering review — 2026-10-13. The v44 package has current source-bound native checks, complete resolving model references, exports and six inspected normal-population/bare views. Newly recovered purple bodies are dimensioned principal-body prisms with contacts, voids and mating features omitted; they are not manufacturer or fit models. Inherited native findings and label crowding remain documented in the board work record. Hardware, electrical and mechanical qualification remain open; no fabrication release or priced saving is claimed.
Baseline documentation snapshot: 2026-10-11, before the requested connector/protection/usability revision program. New revision features require their own reviewed source and qualification evidence.
This page documents an unqualified engineering study, not a released or tested product. Saved CAD, renders and automated checks do not establish a safe assembly, compatible cable, firmware support or a usable current rating.
Board-specific qualification limits: v37/75electrical refs/all export MPNs blank/25question-mark refs;35selected/574later hashes match;19opens/five ignorecats/assembly/thermal/default-off open;dummy-load only.
The exact connector orientation, pin mapping and supply ownership must be taken from the selected revision’s schematic and connection specification. Do not infer wiring from the connector shape.
Power off before connecting or changing jumpers. Verify pin 1, signal direction, supply voltage and ground at both ends of every cable. A mechanically fitting connector is not proof of electrical compatibility. If a host pin mapping or current allocation remains unresolved in the design record, do not connect the board until it is resolved.
Retained v37 review covers75 electrical refs and existing six V1 bypass classes. Retain LT3474,no successor. All75 exported MPNs blank/25trailing-question-mark refs,19opens,assembly/thermal/timing/default-off gates remain. Dummy-load CAD only;no energization,real-laser connection or fabrication release.
Use the configuration and firmware contract for the exact selected revision. Do not copy another module’s socket assignments or assume that an unused pin is available. First-article work must verify source selection, reset/unplug behavior, cable orientation and the actual load or sensor interface before normal operation.
The following are requirements for the next design iterations; this page does not claim they are already fitted:
Documentation route: smoothieware.org/extensions/laser-diode-driver-breakout.
The 2026-10-11 upgrade program has saved additional candidates v38, v39, v40. These studies preserve the historical design described above. Their connector, LED, mechanical and protection changes are revision-specific and remain unqualified.
See the per-board changes, failures and remaining work and mandatory family specification. Use the source hash and native check for the exact candidate being reviewed; do not infer hardware ratings from a rendered population.
The three additional revisions are v38, v39, v40. They are engineering studies; saved CAD and renders do not release the hardware. The latest candidate is described below. Older baseline notes above remain historical.
a96867f5591a14404a8bb64a916fda333cfef4a4fba68bcf0567af4afd4a9dbf.Applicable protection, current-path, thermal, pinout, cable access and physical tests remain open wherever the linked board record has not verified them. A zero native-error count does not close those gates.
The third additive candidate includes a TPS26600 automatic-retry input eFuse, OV cutoff with a separate raw-side indicator, reverse cutoff with a floating blinking LED timer, soft start and individual LED-disable links. Retained ARM/PERMIT/PWM interlocks and all laser-operation restrictions still apply. Automatic retry is not a laser safety stop. Use dummy loads for qualification; no real-laser operation or fabrication is approved. Native routing remains incomplete; see the source-bound readback and per-revision NATIVE-CHECKS.md.