UC3861DW

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The UC3861DW is an integrated Switched-Mode Power Supply (SMPS) controller IC. It is a voltage-mode PWM controller with a simple analog design for offline AC-DC and DC-DC topologies. This integrated SMPS controller offers: improved efficiency, high reliability, and simplified design. The UC3861DW can be used in a variety of applications including LED backlighting, motor control, digital power supplies, and power supplies for consumer electronics.

At the heart of the UC3861DW is the voltage-mode pulse width modulation (PWM) control circuit, which provides excellent line and load transient responses with minimal power dissipation. It has built-in pulse frequency modulation (PFM) for low power applications such as standby power supply. It also has a wide input voltage range (90V~265V) and a wide frequency range (50 kHz~500 kHz). With its advanced features, it offers improved efficiency in most applications.

The UC3861DW has a full range of protection features including over-voltage, under-voltage, and over-current protection. It also has an internal temperature sensing function, allowing it to shut down when necessary in order to prevent damage. The UC3861DW also has a power good indicator that signals when the output voltage is within tolerance.

The UC3861DW has a built-in sawtooth oscillator and internal MOSFET drivers that eliminate the need for external components. This simplifies the circuit design and reduces the overall cost and complexity. The output voltage is adjustable from zero to 12V. The UC3861DW is suitable for low power applications where low efficiencies are acceptable, such as incandescent light bulbs and stepper motors.

The UC3861DW\'s working principle is based on the principle of pulse width modulation (PWM). When an AC voltage is applied to the input of the IC, an internal oscillator generates a sawtooth waveform. This waveform is compared with the reference voltage and the comparator output is used to switch an external power MOSFET. The duty cycle of this waveform, which determines the output voltage, is adjustable through a resistor divider network connected to the external feedback pin.

The UC3861DW is suitable for applications requiring tight line, load and transient regulation. It has a wide input voltage range (90-265V) and a wide frequency range (50kHz-500kHz). The UC3861DW is also capable of operating in both discontinuous mode and peak current mode, allowing for greater efficiency in applications requiring minimum power dissipation.The UC3861DW is designed to meet the stringent requirements of the international EN61000-3-2 standard for harmonic and low power operation.

The UC3861DW is a voltage-mode based SMPS controller and is an excellent choice for offline AC-DC and DC-DC topologies. It has advanced protection features and a wide input and frequency range, providing excellent line and load regulation with minimal power dissipation. Its simplified design and cost-effective solution make it an ideal choice for a wide range of applications.

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