2 layers16.5 × 9 mm
Universal Laser Driver
SAR-mango/Universal-Laser-Driver
A low-power laser driver with an ultra-wide input and output voltage range.
15 parts1
2 layers31.1 × 25.4 mm
ULD Test Board
SAR-mango/Universal-Laser-Driver1A low-power laser driver with an ultra-wide input and output voltage range.
- Size
- 31.1 × 25.4 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 21
- Nets
- 22
- Pads
- 65
- Tracks, vias
- 97, 14
- Pours
- 14
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 14 Sep 2021
- Updated
- 6 Jul 2023
Overview
ULD Test Board is an open-source printed circuit board by SAR-mango, from the SAR-mango/Universal-Laser-Driver repository on GitHub. It is a 2-layer board of 31.1 × 25.4 mm with 21 parts on 22 nets, routed with 97 tracks and 14 vias.
It is built around the AD8515ART and LTC3129IMSE#PBF. Its parts include 8 diodes, 5 capacitors, 4 resistors, 2 ICs and 1 inductor.
Main components
2
AD8515ART
SOT23-51.8 V Low Power CMOS Rail-to-Rail Input/Output Operational AmplifierAnalog DevicesUncategorised
LTC3129IMSE#PBF
MSOP-16-EP-40℃~+125℃@(TJ) 1 1.2MHz 1.3uA 1.4V~15.75V 1.92V~15V 200mA Adjustable Buck-Boost Buck-Boost Built-in Yes MSOP-16-EP DC-DC Converters ROHSAnalog DevicesDC-DC Converters
README
README.mdUniversal Laser Driver
Solves the problem of having to match batteries, laser drivers, and diodes based on input and output voltage and current requirements.
Applications
Intended for low-power laser pointers where space is minimal.
Especially well suited for builds utilizing the Leadlight Pen Host, because the PCB is designed to fit in the plastic carrier that normally holds the switch board. The Leadlight Pen Host requires two 10440-sized battery cells, and the Universal Laser Driver allows the user to swap between AAA alkaline and 10440 Li-ion cells without worrying about damaging the driver or not having sufficient voltage to power the diode.
Specifications
Vin: 2.25–9V
Vout: 1–7V
Iout: 0–200mA
These can very significantly. Lower Vin and/or higher Vout (due to the nonlinear nature of laser diodes) would result in a lower maximum Iout. A lower Iout setting would extend the Vin and Vout ranges.
Project Updates
July 2023: The test board has been shown to reliably produce stable currents between 0 and 200mA using a test load with six standard silicon diodes and one 1Ω resistor in series. Minimal noise was found in the output current waveform, especially below 20MHz. Noise pulses were no more than several nanoseconds long. Therefore, the Universal Laser Driver is unlikely to cause damage or reduced reliability to even the most delicate laser diodes.
The version of the driver meant for the Leadlight Pen Host will be updated to reflect the current schematic for the test board.
Parts
21| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 1N4007 | Diode_SMD:D_SOD-123F | D2, D3, D4, D5, D6, D7, D8 |
| 2 | 1Ω | Resistor_SMD:R_1210_3225Metric_Pad1.30x2.65mm_HandSolder | R2, R4 |
| 2 | 22nF | Capacitor_SMD:C_0805_2012Metric_Pad1.18x1.45mm_HandSolder | C2, C3 |
| 2 | 22µF | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C1, C5 |
| 1 | 10kΩ | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R3 |
| 1 | 2kΩ | Potentiometer_SMD:Potentiometer_Bourns_TC33X_Vertical | RV1 |
| 1 | 4.7µF | Capacitor_SMD:C_1210_3225Metric_Pad1.33x2.70mm_HandSolder | C4 |
| 1 | 6.8µH | Inductor_SMD:L_Taiyo-Yuden_MD-4040 | L1 |
| 1 | 68Ω | Resistor_SMD:R_0805_2012Metric_Pad1.20x1.40mm_HandSolder | R1 |
| 1 | AD8515 | Package_TO_SOT_SMD:SOT-23-5_HandSoldering | U2 |
| 1 | LED | LED_SMD:LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1 |
| 1 | LTC3129IMSE | Package_SO:MSOP-16-1EP_3x4.039mm_P0.5mm_EP1.651x2.845mm | U1 |
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Questions
How big is the ULD Test Board PCB?
It measures 31.1 × 25.4 mm and has 2 copper layers, 1.6 mm thick.
What parts does the ULD Test Board use?
21 parts, built around the AD8515ART and LTC3129IMSE#PBF. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the ULD Test Board KiCad files?
From the SAR-mango/Universal-Laser-Driver repository on GitHub, at the commit this page was made from: the board is ULD_Test_Board/ULD_Test_Board.kicad_pcb and its schematic ULD_Test_Board/ULD_Test_Board.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the ULD Test Board design in my own project?
Its repository states no licence, so its author keeps all rights: ask SAR-mango before reusing the design.