2EI4O

TC3X7_BTB core board

Overview

This chip may be locked; purchase with caution. Refurbished chips
are smaller and more reliable. BTB connectors
are purchased from Taobao's Shangudao Electronics. 0.8mm pitch, 4.0mm height, 50p
pins. Defines a DAP interface compatible with my open-source downloader.
Before soldering the BGA, please tin the PCB pads, then smooth and clean them, add a little solder flux, and then place the BGA with the balls aligned and heated. The solder paste layer in the project has been modified to have square holes, which can be directly used for manual soldering stencil
packaging: Self-made _TC3x7 core board.

PDF_TC3X7_BTB core board.zip

Altium_TC3X7_BTB core board.zip

PADS_TC3X7_BTB core board.zip

BOM_TC3X7_BTB Core Board.xlsx

92436

N20 motor small flashlight v2

Knob-powered flashlight EDC toy

The N20 geared motor charges the capacitor, driving the LED beads to emit light. The package includes 3D printed shell files. Compared to the original, this version features the ability to generate electricity in both forward and reverse directions.

n20 motor small flashlight v2 (fix).stl

PDF_n20 Mini Flashlight v2.zip

Altium_n20 motor mini flashlight v2.zip

PADS_n20 Mini Motor Flashlight v2.zip

BOM_n20 Mini Flashlight with Motor v2.xlsx

92437

FP7125 step-down LED driver

This project is a high-power LED driver design based on the FP7125 LED driver chip from Yuanxiang Technology.

The FP7125 is an average current-mode LED driver IC that operates in a constant off-time mode. The FP7125 does not produce peak-to-average current error, thus significantly improving LED current accuracy, line and load regulation without the need for loop compensation or high-side current sensing. The output LED current accuracy is ±3%. The FP7125 can be powered from 8.0-100V. It provides PWM and linear dimming inputs and accepts external TTL-compatible control signals. The output current can be programmed via an internal 250mV reference.
The shorted pins in the image are for debugging and have been removed in the production project; they do not need to be shorted again.
In this project, the output current is set by adjusting the current sampling resistor U2. The current calculation method is shown in the figure below. This project recommends use below 3A; higher power requires larger inductors and improved heat dissipation.

PDF_FP7125 Buck LED Driver.zip

Altium_FP7125 step-down LED driver.zip

PADS_FP7125 Step-Down LED Driver.zip

BOM_FP7125 Step-Down LED Driver.xlsx

92438

electronic

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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