UC2861NG4

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The UC2861NG4 is a current-mode pulse width modulator designed for use across a wide range of off-line AC-to-DC converter and switcher applications. It is ideal for applications such as telecommunications, industrial, consumer and automotive, offering maximum reliability for the switching power supplies. The UC2861NG4 has a number of features that make it suitable for such applications, including its operable range, protection and fault detection capability, system start-up and control, and power savings mode.

The device operates from an input voltage range of 90 V to 265 V, and can operate across any frequency range from 50kHz to 500kHz. It also features an adjustable undervoltage lockout and adjustable soft-start to ensure system start-up reliability. Moreover, it includes peak current limit and cycle-by-cycle current limit protection, and an internal 0.3 A clamping path with a diodeless topology to prevent damage to the primary side switching components.

The UC2861NG4 offers a soft-stop and sleep control mode in order to reduce current consumption during standby, and a built-in thermal protection with a hysteresis delay during start-up, as well as a fault detection output pin which can be used to trigger the downstream controller in the event of an over- or under-voltage fault. It also provides an adjustable frequency limit protecting against large surges in current and power losses in the secondary side, thus increasing the system performance.

In terms of working principle, the UC2861NG4 is a current-mode, pulse width modulating control IC for AC to DC converters. It uses a primary side sensing technique, which samples the current at the output of the power switch in order to set the switching frequency, hence making the transition from continuous conduction mode to discontinuous conduction mode, which improves the efficiency across the entire load range. The UC2861NG4 also utilizes a quasi-resonant topology, eliminating the need for an external resonant capacitor and enabling the system to operate smoothly with no audible noise.

The UC2861NG4 is an ideal solution for various applications across a wide range of AC-to-DC converter and switcher applications; this includes telecommunications, industrial, consumer, and automotive. It offers maximum reliability for the switching power supplies, features an adjustable undervoltage lockout and adjustable soft-start for system start-up reliability, and a number of power savings modes and protection features to protect the system from damages. In terms of working principle, the UC2861NG4 is a current-mode, pulse width modulating control IC, utilizing a primary side sensing technique to set the switching frequency and a quasi-resonant topology to operate smoothly with no audible noise.

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