★ Samsung Charger Circuit (Model: EP-TA50IXE):
The Samsung charger was identified by the model number EP-TA50IXE and internal board number SB0412_12501E1.
➠ Charger Board Model Number: EP-TA50IXE
➠ Charger Board Others Number: SB0412_12501E1
➠ Transformer 400 v to 5 Volt Step Down
★ 1. Thermistor (DSC 20D5) - NTC Type:
➠ Function: The NTC (Negative Temperature Coefficient) thermistor is used for inrush current limiting. When the charger is plugged in, the thermistor initially presents a higher resistance, limiting the sudden current rush, and protecting the circuit components. As it warms up due to the current flow, its resistance decreases, allowing more current to pass through.
➠ Placement: This thermistor is placed right after the AC input and before the bridge rectifier to safeguard the entire circuit.
★ 2. Bridge Rectifier Section
➠ Using Bridge Arectifire Components: Diode.
➠ Total Diode Using Bridge Rectifier: 4 Diode
➠ Diode Number: R52
➠ Components: The rectifier is composed of four diodes, each labelled as R52.
➠ Function: The bridge rectifier converts the incoming AC voltage to pulsating DC voltage. This is a crucial first step in the power conversion process, as most electronic devices require DC voltage.
➠ Operation: During each half cycle of the AC input, two diodes conduct and allow current to pass, creating a unidirectional current flow.
★ 3. Capacitors in the Circuit
➠ Total Polar Capacitors: 6 capacitors are used, each serving specific roles.
➠ Capacitor 1 & 2
➠ Specifications: 400V, 12µF
➠ Function: These are placed in series after the bridge rectifier. Their primary function is to smooth out the pulsating DC voltage by filtering high-frequency noise. This ensures that the subsequent circuitry receives a more stable DC voltage.
➠ Capacitor 3
➠ Specifications: 400V, 15µF
➠ Function: Located on the switching MOSFET side, this capacitor is crucial in maintaining a stable voltage across the MOSFET during its switching operations. It also helps in reducing voltage spikes that could potentially damage the MOSFET.
➠ Capacitor 4
➠ Specifications: 50V, 10µF
➠ Function: This capacitor is connected to the feedback circuit of the switching IC. It stabilizes the feedback loop by filtering noise, ensuring that the switching IC can precisely regulate the output voltage.
➠ Capacitor 5
➠ Specifications: 15V, 10µF
➠ Function: Found in the 5V output section, this capacitor helps stabilize the output voltage. It also works with the voltage controller IC to ensure that the final output remains within safe and desired levels.
★ 4. Switching IC (360H1M)
➠ Switching Ic Number: 360H1M
➠ Switching Ic Serial Number: 731512
➠ Switching Ic Total Pin: 8 Pin IC
➠ Role: The switching IC is the heart of the charger’s power regulation. It controls the switching MOSFET to regulate the transfer of energy from the input to the output. The IC operates by switching the MOSFET on and off at high frequency, converting the rectified DC into a form that can be efficiently stepped down and filtered to produce the final output voltage.
➠ Feedback Mechanism: The IC also takes feedback from the output (via the capacitor on the feedback side) to adjust the duty cycle of the switching operation, ensuring stable output despite variations in input voltage or load.
★ 5. Switching MOSFET (CS3N90)
➠ Part Number: CS3N90
➠ Serial Number: A3H1G
➠ Role: The MOSFET acts as a switch, controlled by the switching IC, to modulate the flow of current through the transformer. It’s designed to handle the high voltages and currents involved in the switching process. This MOSFET is critical in the step-down conversion from the high-voltage side to the low-voltage side.
★ 6. Voltage Controller IC (34330C)
➠ Voltage Controler Ic Number: 34330C
➠ Voltage Controler Ic Serial Number: 752M27
➠ Voltage Controler Ic Total Pin Number: 8 Pin IC
➠ Role: This IC monitors and controls the output voltage. It compares the actual output voltage with a reference and adjusts the operation of the switching IC to maintain the desired output. This ensures that the charger delivers a consistent 5V output, regardless of fluctuations in the input voltage or variations in load.
➠ Feedback Loop: The voltage controller is integral to the feedback loop that helps stabilize the output. It works closely with the switching IC and associated capacitors to maintain tight regulation.
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