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TINY DC-DC Power Module – Input 8-28V DC – Output 5V DC 1A

This tiny power module is an easy-to-use integrated power solution that combines a 3A DC/DC converter chip with inbuilt power MOSFETs, an inductor, and passives into a 3-pin, through-hole package. The standard TO-220 pin-out allows a much-improved replacement of linear regulators packaged in this industry-standard footprint. The circuit provides much higher efficiency and output current without the need for a heatsink. This is an easy replacement of the LM7805 linear regulator with higher input voltage and output current than LM7805. Operating supply 8-28V DC, output 5V DC at 1A. The project is built using the TPS54302 chip from Texas instruments.

The TPS54302 is a 4.5-V to 28-V input voltage range, 3-A synchronous buck converter. The device includes two integrated switching FETs, internal loop compensation and 5-ms internal soft start to reduce component count. By integrating the MOSFETs and employing the SOT- 23 package, the TPS54302 achieves the high-power density and offers a small footprint on the PCB. Advanced Eco-mode implementation maximizes the light load efficiency and reduces power loss. In the TPS54302, the frequency spread-spectrum operation is introduced for EMI reduction. Cycle-by-cycle current limit in both high-side MOSFET protects the converter in an overload condition and is enhanced by a low-side MOSFET freewheeling current limit which prevents current runaway. Hiccup mode protection is triggered if the overcurrent condition has persisted for longer than the present time.

Output

The circuit provides a fixed 5V DC and this can be changed. The output voltage is set with a resistor divider from the output node to the FB pin. It is recommended to use divider resistors with 1% tolerance or better. Start with 100 kΩ for the upper resistor divider and use Equation 3 to calculate the output voltage. To improve efficiency at light loads consider using large value resistors but keep in mind that if the values are too high the regulator is more susceptible to noise and voltage errors from the FB input current are noticeable.

Features

  • Direct Replacement to linear regulator LM7805
  • Input Supply 8-28V DC
  • Output 5V @ 1A Maximum
  • More Than 90% Efficiency
  • 400Khz Switching Frequency
  • Over Current Protection
  • Over Voltage Protection
  • Thermal Shutdown
  • Frequency Spread Spectrum to Reduce EMI
  • PCB Dimension’s 16.03  x 15.40 mm

Schematic

Parts List

SR.QNTY.REF.DESC.MANUFACTURERSUPPLIERSUPPLIER PART NO
11CN13 PIN MALE HEADER RIGHT ANGLE 2.54MM PITCHWURTHDIGIKEY732-5316-ND
21C110uF/35VTDKDIGIKEY445-172484-1-ND
32C2,C30.1uFMURATA/YAGEODIGIKEY
41C447uF/16VMURATADIGIKEY490-6538-1-ND
52C5, C610uF/10V SMD SIZE 0805YAGEODIGIKEY311-1865-1-ND
61C7100PF/50V SMD SIZE 0805MURATA/YAGEODIGIKEY
71L110uH/2.5A, 6MMX6MMBOURNS INCDIGIKEYSRN6045-100MCT-ND
81R149.9E 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
91R2100K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
101R313K 1% SMD SIZE 0805MURATA/YAGEODIGIKEY
111U1TPS54302TIMOUSER595-TPS54302DDCR

Connections

Gerber View

Photos

Video

TPS54302 Datasheet

Seeed Studio 1.3inch OLED Display Module

Posted on by mixos

Seeed Studio 1.3inch OLED Display Module is for the Raspberry Pi Pico, has 64×128 Pixels, and an SPI/I2C Interface. The 1.3″ OLED Display Module has an embedded SH1107 driver and uses the SPI/I2C Bus. It comes with a Raspberry Pi Pico C/C++ and MicroPython Demo.

Features

  • Adopts both 4-wire SPI and I2C interface, better compatibility, fast data rate
  • 2x user buttons for easy interacting
  • Standard Raspberry Pi Pico header supports Raspberry Pi Pico series boards
  • Comes with development resources and manual (Raspberry Pi Pico C/C++ and MicroPython examples)

more information: https://www.seeedstudio.com/1-3inch-OLED-Display-Module-for-Raspberry-Pi-Pico-p-4909.html

Melexis MLX90377 Triaxis Magnetic Position Sensors

Posted on by mixos

Melexis MLX90377 Triaxis® Magnetic Position Sensors are available in rotary and linear variants. These MLX90377 sensors support analog, PWM, SENT, and SPC outputs, specially conceived for demanding automotive applications. The magnetic position sensors are designed with Triaxis® Hall Technology for performance and flexibility. The MLX90377 position sensors feature on-chip signal processing for robust absolute position sensing and enhanced serial data communication. These magnetic position sensors operate from 4.5V to 18V supply voltage range and -40°C to 160°C temperature range. The MLX90377 sensors are available in SOIC-8, TSSOP-16, DMP-4, and SMP-3 packages. Typical applications include a pedal position sensor, throttle position sensor, ride height position sensor, and small-angle position sensor.

Video

Features

  • Selectable output modes:
    • (fast) SENT (SAE J2716 APR2016)
    • Short PWM Code (SPC)
    • Pulse Width Modulation (PWM)
    • Ratiometric analog
  • Programmable linear transfer characteristic:
    • Either 4 or 8 multi-points
    • 16 or 32 piece-wise-linear
  • Programmable measurement range
  • Robustness against stray-field up to 5mT
  • 4.5V to 18V operating supply voltage range
  • -40°C to 160°C operating temperature range
  • Triaxis® Hall Technology for performance and flexibility
  • On-chip signal processing for robust absolute position sensing
  • Enhanced serial data communication
  • 48-bit ID number option
  • Packages, RoHS compliant:
    • SOIC-8 (DC), Single Die
    • TSSOP-16 (GO), Dual Die (Redundancy)
    • DMP-4 (VS), Single Die in Dual Mold PCBless solution
    • SMP-3 (VE), Single Die in Single Mold PCBless solution
  • Certifications:
    • AEC-Q100 Grade-0
    • ISO26262 Safety Element out of Context (SEooC)
    • ASIL-C capable for (fast) SENT, PWM Output modes
    • ASIL-B capable for analog output mode

more information: https://www.melexis.com/en/product/MLX90377/Triaxis-Performance-Rotary-Linear-Position-Sensor-Analog-PWM-SENT-SPC

LTM4681 – Quad 31.25A or Single 125A μModule Regulator with Digital Power System Management

Posted on by mixos

Analog Devices Inc. LTM4681 μModule® DC/DC Regulator features remote configurability and telemetry monitoring of power management parameters over PMBus. The LTM4681 is comprised of digitally programmable analog control loops, precision mixed-signal circuitry, EEPROM, power MOSFETs, inductors, and supporting components. The regulator’s 2-wire serial interface allows outputs to be margined, tuned and ramped up and down at programmable slew rates with sequencing delay times. It features readable true input current sense, output currents and voltages, output power, temperatures, uptime, and peak values. Custom configuration of the EEPROM contents is not required. At start-up, output voltages, switching frequency, and channel phase angle assignments can be set by pin strapping resistors. The LTpowerPlay® GUI and DC1613 USB-to-PMBus converter and demo kits are available. The LTM4681 is housed in a 15mm × 22mm × 8.17mm BGA package available with SnPb or RoHS compliant terminal finish.

Block Diagram

Features

  • Quad Digitally Adjustable Analog Loops with Digital Interface for Control and Monitoring
  • Wide Input Voltage Range: 4.5V to 16V
  • Output Voltage Range: 0.5V to 3.3V
  • ±0.5% Maximum DC Output Error Over Temperature
  • ±4% Current Readback Accuracy: 0°C to 125°C
  • Integrated Input Current Sense Amplifier
  • 400kHz PMBus-Compliant I2C Serial Interface
  • Supports Telemetry Polling Rates Up to 125Hz
  • Integrated 16-Bit ΔΣ ADC
  • Parallel and Current Share Multiple Modules
  • 15mm × 22mm × 8.17mm BGA Package
  • Readable Data
    • Input and Output Voltages, Currents, and Temperatures
    • Running Peak Values, Uptime, Faults, and Warnings
    • Onboard EEPROM Fault Log Record
  • Writable Data and Configurable Parameters
    • Output Voltage, Voltage Sequencing, and Margining
    • Digital Soft-Start/Stop Ramp, Program Analog Loop
    • OV/UV/OT, UVLO, Frequency, and Phasing

Dimensions

more information: https://www.analog.com/en/products/ltm4681.html?ADICID=some_NA_P328165_Twitter_IMG_LTM4681

3D Printed Moon Lithophane Lamp

Posted on by DM

Lithophanes are artistic creations on ultra-thin translucent porcelain that is visible only when backlit with a light source. They are etched or modeled artworks made by a 2D image. The 2D image is first processed to make its gray-scale representation, and then, depending on the color, it is then converted to a calculated 3D printed height. This process allows a specific amount of light to shine through. The darker colors block more light, and the opposite relationship stands for lighter pixels. Each pixel in the image undergoes this process and results in a very creative art piece. This varying light source is what makes lithophanes interesting to the viewer than the 2D engravings or images.

Lithophanes are a 3D representation of photos that can make creative gifts for any occasion. It’s also a way to highlight your 3D printing skills that are not familiar to everyone. The process of creating lithophanes includes initially converting a 2D image into a gray-scale and make the detail levels to maximum. The “Make Lithophane” action is also available on Adobe Photoshop that will allow you to create gray-scale images suitable for lithophanes. Then STL file is exported that is 3D printed by a high-resolution stereolithography (SLA) printer.

One of the most important aspects to keep in mind while making lithophanes is the color contrast. The selection of the right picture that has a variety of color contrast is highly critical. A dark picture (one with a lot of deep colors) might make the details of the finished product hard to see. Therefore, an image with a good combination of light and dark colors is desirable for generating an excellent lithophane. The surface of the Moon is a good choice for making a lithophane.

Tiffany Lo recently demonstrated by an Instructable how to make a 3D-printed Moon lithophane. The project uses Lithophane Maker’s Globe Maker and Fusion 360 design to create a colorful moon image. Tiffany combined the NASA data of the Moon and with the globe maker. The sphere was 3D printed on a typical FDM printer. Then assembled the printed globe on a base with LED strips for backlighting.

Tiffany says,

“It’s perfect as a small lamp or decoration for any person who doesn’t want to wait for the night time to see the Moon. “She further added, “If you want a beginner-friendly and inexpensive project, be sure to follow this Instructable so you can create your own moon lamp! Throughout this process, you will be able to practice your skills in learning how to 3D print for the first time and designing in Fusion 360.”

Project link: https://www.instructables.com/3D-Printed-Moon-Lithophane

BIGTREETECH SKR MINI E3 V2.0 32 Bit Control Board for the Ender3 Printers

Posted on by DM

3D printer controller boards are the brains of any 3D printer. All the electrical components are interfaced with the printer motherboard. The main job of the controller is to follow the code from the 3D printer software and produce a 3D printed object. The controller receives various inputs like the extruder temperature or the state of the limit switches, and it controls the stepper motor’s direction on the axis. The 3D printer controller consists of a variety of sub-circuits, including a microcontroller, stepper motor drivers, and various sensor ports. There has been a lot of development in the field of additive manufacturing, and using a tailor-made customized motherboard for a particular 3D printing device is a good choice as it can perfectly replace the controller of that original printer.

BIGTREETECH SKR MINI E3 V2.0 32 Bit Control Board with integrated TMC2209 UART is a customized motherboard for Ender3 printer launched by the 3D printing team of Shenzhen BIGTREE technology co. LTD. It can perfectly replace the motherboard of the original Ender3 printer. The BIGTREETECH SKR MINI E3 controller boards are ultra-quiet, low-power, high-quality 3D printing machine controller boards from BIQU.

BIGTREETECH team says about the improvements made in this new version of the control board,

“BIGTREETECH SKR Mini E3 V2.x has added additional hardware improvements and enhancements based on community feedback. Among other things, these improvements and enhancements with SKR Mini E3 V2.x include two Z-axis interface ports, and SKR Mini E3 V2.x is today, in addition to the 3D-printers already support by the V1.x boards, also compatible with CR-10S, CR-10 S4, CR-10 S5, Ender 5, Ender 5 Pro, and Ender 5 Plus from Creality.”

The control board consists of the ARM Cortex-M3 STM32F103RCT6 microcontroller. For motor driving, onboard TMC2209 IC is used. The TMC2209 is an ultra-silent motor driver IC for two-phase stepper motors. It has an easy-to-use UART interface that opens up tuning and control options. The supported file format for coding is GCode and is compatible with software like Cura, Simplify 3D, Pronterface, Reptier-host, and Makerware. The control board supports a double Z-axis interface and other functions like BLTouch, filament detection, power-off resume, automatic shutdown, etc.

The control board uses an MP1584EN power chip which supports 12-24V input power and a maximum current of up to 2.5A. The onboard ports include two CNC fan interfaces. For thermal management, the board utilizes WSK220N04, which has low on-resistance and reduced heat dissipation. Moreover, the heat dissipation capacity is enhanced by enlarging the heat-sinking area on the PCB.

The BIGTREETECH motherboard comes with pre-installed firmware for testing, which can be changed or modified according to one’s needs. The firmware can be found here, and there is a BLTouch pre-configured firmware for SKR-mini-E3 V2.0, which provides support for BLTouch auto-leveling sensors.

In the summary, the BIGTREETECH SKR-mini-E3 V2.0 is a powerful and efficient control board tailor-made for Ender-3 printers.

Raspberry Pi’s RP2040 Chip Now Available for $1

Posted on by Emmanuel Odunlade

Coming at a time when the global chip shortage is crippling productions across the world, Raspberry Pi Foundation CEO Eben Upton, today shared the news, which will no doubt gladden the heart of many, that the chip at the heart of the Raspberry Pi Pico development board; the RP2040, is now available for sale as a standalone chip at a price of just $1.

Designed and developed in-house by the team at the Raspberry Pi, the RP2040 has enjoyed great reviews since its debut on the Raspberry Pi Pico development board, with features like its large on-chip memory, speed, and a wide range of I/O endearing it to a lot of makers and hobbyists. It has featured on boards like the Adafruit QT Py RP2040, and the Arduino Nano RP2040 Connect which was released just a few weeks back, but it is being made available to regular buyers for the first time since launch.

The availability of the RP2040 in the open market means designers can now use the Raspberry Pi Pico in the design phase and shift to the RP2040 in production, giving ultimate flexibility and opportunity for design engineers, all the combined price of $5.

Packed into a QFN56 7x7mm package, the RP2040 features dual Cortex M0+ cores with up to 133 MHz, backed up by 6 banks of 264KB embedded SRAM, with 30 multi-purpose GPIOs which can be controlled via firmware developed using Micropython, C/C++, FreeRTOS, and Rust, and “Arduino C” thanks to the recent Arduino IDE support for the RP2040, which is expected to make the chip even more popular due to the ease and popularity of the Arduino platform.

Internal Diagram

Twitter

Some highlight features of the RP2040 include:

  • Two ARM Cortex-M0+ cores clocked at 133 MHz
  • 264 kB of on-chip SRAM
  • 30 multifunction GPIO pins
  • Dedicated hardware for commonly used peripherals alongside a programmable I/O subsystem for extended peripheral support
  • Four-channel ADC with inbuilt temperature sensor and 12-bit conversion
  • Built-in USB 1.1 host/device support.
  • SWD Debug interface

More details on the features of the RP2040 can be found in our announcement article for the Raspberry Pi Pico.

While prices may begin to vary as it starts arriving in the hands of retailers, the current price per chip according to the foundation’s approved seller is $1, and a yet to be determined discounted price is being expected for the Reel/tape version.

While supply may still be short at the moment as most of the suppliers are sold out at the time of this writing, it is expected to pick up soon as more orders come in.

More information on the RP2040 and sales can be found on the announcement page here.

Photorelay offers 1.2-A on-state current rating

Posted on by mixos

With enhanced sensitivity, this photorelay provides engineers with a more convenient and reliable alternative to conventional mechanical relays.

Toshiba Electronics Europe GmbH has further strengthened its extensive optoelectronics portfolio with the introduction of a new photorelay. Supplied in a compact DIP6 package, the TLP4590A provides engineers with a more convenient and reliable alternative to conventional mechanical relays. This 1-Form-B (normally closed) photorelay has an on-state current rating of 1.2-A, which represents a 140% improvement on the company’s previous-generation TLP4176A device. In addition, it has a 60-V off-state output terminal voltage rating. Its sensitivity is enhanced thanks to the low trigger LED current of 2 mA (maximum) exhibited.

Among the key applications for these photorelays are those relating to building automation – including heating, ventilation, air conditioning and security systems, as well as fire alarms. They can also be used in various forms of industrial equipment, such as programmable logic controllers (PLCs), I/O interfaces and sensor control hardware. Their 5,000 Vrms (minimum) isolation voltage allows them to be employed in situations where elevated levels of insulation performance are required, while support for a -40°C to 110°C operational temperature range enables them to be installed within harsh environments.

more information: https://toshiba.semicon-storage.com/ap-en/semiconductor/product/optoelectronics/photorelay-mosfet-output/detail.TLP4590A.html

Siemens accelerates digital marketplace strategy with acquisition of Supplyframe for USD 0.7 billion

Posted on by mixos

Siemens has signed an agreement to acquire Supplyframe, a leading Design-to-Source platform for the global electronics value chain, for USD 0.7 billion. The transaction unlocks significant value for customers of Supplyframe and Siemens, providing seamless and quick access to both Siemens’ offerings and Supplyframe’s marketplace intelligence. This will help customers to reduce costs, increase agility and make highly informed decisions. The acquisition also strengthens the Siemens portfolio through Software as a Service (SaaS) – not only in the field of Electronic Design Automation (EDA) and Printed Circuit Boards (PCB), but also scaling into other domains and technology fields.

“We are very pleased to welcome Supplyframe’s highly innovative and talented team to the Siemens family. Supplyframe will be the nucleus to accelerate our overall digital marketplace strategy,” said Cedrik Neike, member of the Managing Board of Siemens AG. “Supplyframe’s ecosystem and marketplace intelligence complements our industrial software portfolio perfectly and strengthens our capabilities for the growing market of small- and mid-size customers.”

“Eighteen years ago, we set out on a journey to intelligently connect the extended electronics value chain. It took both a dedicated team and a visionary customer base to gradually turn our vision into reality. This process has been further accelerated by the recent component shortage environment, which has exposed the fragility of supply chains and created a mandate for digital transformation and intelligent decision making. I am thrilled to join forces with Siemens to scale our innovation and drive broader adoption of our DSI solutions globally.  This is an amazing outcome for our customers, partners and employees,” said Steve Flagg, CEO and founder of Supplyframe.

Supplyframe has created a strong Design-to-Source Intelligence (DSI) ecosystem with over 10 million engineering and supply chain professionals worldwide, transforming how businesses design, source, market and sell products in the global electronics value chain. Supplyframe’s SaaS offerings have been growing with ca. 40% p.a. over the last years, a rate that is expected to continue mid-term.

Highlights:

  • Siemens to acquire Supplyframe, a leading and fast-growing marketplace for the global electronics value chain
  • Combining Supplyframe’s knowhow with Siemens’ leading software enables customers to innovate and develop products faster
  • Supplyframe to be the nucleus of Siemens’ digital marketplace strategy
  • Closing of transaction expected in fourth quarter of fiscal year 2021

Siemens will realize significant synergies between Supplyframe’s capabilities and its own portfolio with an expected USD mid-triple digit net present value. EPS accretive pre-ppa in second year after closing. Steve Flagg will continue as CEO of the company and join the Siemens Digital Industries Software senior leadership team.

Founded in 2003, Supplyframe is headquartered in Pasadena, California with offices in the USA, China, France, Serbia, and the UK. The expected revenue of Supplyframe for the fiscal year 2021 is around $70 million with profit margins typical for the software business.

Closing of the transaction is subject to customary conditions and is expected in the fourth quarter of the fiscal year 2021.

Automatic LED Stairway Lighting – Arduino Compatible

Posted on by mixos

This creative idea is suitable for a stairway with 16 stairs, each stair can have a 12V LED. It has two sensors one at the start and one at the end of the stairs and when the sensor triggered at any end it starts a process of lighting each of the steps in a progressive cycle starts. When you reach the other side of the stairway and the second sensor is triggered it will start to extinguish all the lit lights in the ascending cycle.

This is a very simple and easy to build project based on the Arduino platform The board consists of an ATMEGA328 microcontroller, 16 channel MOSFETs, 2 optical retro-reflective or optical defuse sensor, 16 x 12V LEDs, LM7805 regulator, DC filter capacitors, and optional current limiting resistor on each MOSFET. The circuit requires 12V DC, each MOSFET can drive a LED up to 1A (0.5 to 12W LED)

Automatic LED Stairway Lighting – Arduino Compatible – [Link]

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