UC2861DW

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The UC2861DW is an integrated single-ended primary-turns Flyback (STEP-DOWN) DC-DC converter offering fixed frequency current mode control. It is a component of the power management resource of an electronic system which forms an AC-DC converter and an offline switcher. This component helps to generate necessary voltage which is used to power different electronic components of the system.

The UC2861DW utilizes harmonic distortion frequency control of current mode PWM control technology which limits losses and enhances stability. The PWM signal generated by UC2861DW has average value zero and peak-to-peak value in flux modulation with adjustable frequency and duty cycle level. It effectively controls the output voltage, current and power while avoiding over-voltage, under-voltage and over-current problems.

For signal switching of low power devices like microcontrollers, the UC2861DW can provide up to 0.5A of continuous current. It has very fast transition time of approximately 5MHz, speed of output response of about 5us and high system efficiency. The power supply efficiency is about 85% for a given regulation and load range. The output voltage range of the UC2861DW can be adjusted to any value between the reciprocal of the duty cycle and the input voltage.

The off-line switching circuit within the UC2861DW consists of two current mirrors which are connected in series. The first current mirror acts as a current source while the second acts as a load. This connection uses a high power supply voltage to ensure low-power losses and provide high current-handling capabilities. The switching transistor is connected in series with the current source. When the current reaching the transistor exceeds the set level, it is switched off and the voltage at the source is then clamped to the input voltage.

The UC2861DW is mainly used in credit card terminals and point-of-sale systems. It is also applicable to applications with very low voltage standby operation and high voltage input operation. Moreover, it can be used for off-line boost converter, buck converter, flyback converter and other isolated converters, providing up to 3.5A of output current.

In summary, the UC2861DW is an integrated single-ended primary-turns Flyback (STEP-DOWN) DC-DC converter. It is mainly used for credit card terminals and point-of-sale systems, but can also be applied in many different applications. The UC2861DW utilizes the harmonic distortion frequency control of current mode PWM control technology which has average value zero and peak-to-peak value in flux modulation. It also has a very fast transition time, speed of output response and high system efficiency. It can provide up to 0.5A of continuous current and has a power supply efficiency of around 85% for a given regulation and load range.

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