Board-dat/SCU/SCU1030-DAT/SCU1030-DAT.md
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![](17-10-17-21-06-2023.png)
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+- [[SCU1030-dat]] - [[SG90-dat]]
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+
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- Model: SG90
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- Weight 13 grams Angle
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- 90-180 degrees universal
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-## TS90
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-
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-- TS90A motor gears are made of metal, ensuring smooth rotation and preventing deformation under heat.
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-- TS90A potentiometer gear shafts are also made of metal, resisting deformation under stress.
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-- TS90A gears have stop points for limiting movement.
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-
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-
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## ref
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-- [[servo-dat]]
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\ No newline at end of file
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+- [[motor-servo-dat]]
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Tech-dat/acturator-dat/motor-dat/motor-servo-dat/SG90-dat/SG90-dat.md
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+
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+
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+# SG90-dat
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+
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+- [[SCU1030-dat]] - [[SG90-dat]]
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+
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+- [[servo-horn-dat]] - [[motor-servo-dat]]
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+
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+screw == M2 x 7.5
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+
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+![](2026-03-13-20-19-05.png)
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+
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+
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+## internal gearbox
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+
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+- [[gear-dat]] - [[gearbox-dat]] - [[SG90-dat]]
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+
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+![](2026-03-13-20-20-49.png)
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+
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+![](2026-03-13-20-21-00.png)
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+
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+![](2026-03-13-20-21-13.png)
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+
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+
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+
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+## TS90
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+
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+- TS90A motor gears are made of metal, ensuring smooth rotation and preventing deformation under heat.
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+- TS90A potentiometer gear shafts are also made of metal, resisting deformation under stress.
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+- TS90A gears have stop points for limiting movement.
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+
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+
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+
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+
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+## ref
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+
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+
battery-dat/battery-BMS-dat/battery-protector-1s-dat/battery-protector-1s-dat.md
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- [[battery-protector-dat]] - [[protection-dat]] - [[protection-power-dat]]
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+
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+
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+
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+
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+## solution 1 DW01 + 8205
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+
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+
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![](2026-03-05-19-36-20.png)
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+current supply Theoretical vs. Practical Limits
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+
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+Most standard modules using a single **8205A** (Dual N-Channel MOSFET) are designed for the following:
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+* **Safe Continuous Current:** **2A to 2.5A**
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+* **Peak/Overcurrent Trip Point:** **3A to 4.5A**
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+
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+If your module has **two** 8205A chips soldered onto the board, these values generally double (**4A-5A continuous**).
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+
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+### 2. How the Limit is Calculated
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+The DW01 protects against overcurrent by monitoring the voltage drop across the MOSFETs ($V_{FET}$). It has a fixed internal trigger voltage (Overcurrent Detection Voltage) of **150mV** (0.15V).
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+
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+Using Ohm’s Law, the trip current ($I_{OC}$) is calculated as:
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+
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+$$I_{OC} = \frac{V_{DET2}}{R_{DS(on)} \times 2}$$
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+
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+* **$V_{DET2}$:** 0.15V (DW01 standard)
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+* **$R_{DS(on)}$:** ~0.025Ω (Typical for one 8205A MOSFET)
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+* **Multiplier:** 2 (Because the discharge current must pass through both MOSFETs in the dual-chip package).
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+
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+**Example Calculation:**
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+$$I = \frac{0.15}{0.05} = 3\text{A}$$
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+
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+---
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+
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+### 3. Quick Reference Table
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+
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+| Component Setup | Max Recommended Continuous | Instantaneous Trip Point |
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+| :--- | :--- | :--- |
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+| **Single 8205A** | 2.0A | ~3.2A |
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+| **Dual 8205A (Parallel)** | 4.0A | ~6.4A |
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+| **Triple 8205A (Rare)** | 6.0A | ~9.6A |
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+
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+---
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+
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+### 4. Important Limitations
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+* **Thermal Constraints:** The 8205A is a very small SOT-23-6 package. At 3A, it generates significant heat. Without proper PCB copper traces to act as a heatsink, the chip can overheat and fail even if you haven't hit the "trip" limit.
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+* **Voltage Sag:** High current causes a voltage drop across the MOSFETs. If your battery is already low, this drop might cause the DW01 to trigger the **Under-Voltage Protection** prematurely.
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+* **Component Quality:** Generic or "knock-off" 8205A chips often have higher $R_{DS(on)}$ (internal resistance), which leads to more heat and lower actual current thresholds.
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+
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+
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## ref
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mechanics-dat/mechanical-parts-dat/gear-dat/gearbox-dat/gearbox-dat.md
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## type of gearbox
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+
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+- [[motor-servo-dat]] - [[gearbox-dat]] == - [[SG90-dat]]
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+
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+
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### Planetary Gearbox:
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These are highly efficient and keep the output shaft in line with the motor shaft. They are great for high-torque applications like robotics or electric vehicles.