UC3846QTR

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The UC3846QTR is a pulse-width modulation (PWM) controller designed to provide synchronous rectification control and precision current limiting for high power density applications. This controller is available in the temperature-compensated power package. It requires an isolated feedback to ensure proper current limit and load regulation.

The UC3846QTR is a switching controller designed to provide synchronous rectification control, voltage and current limit control, and soft-start operations. These features are suitable for a wide range of low power switching applications. It also provides an AccurateCurrent Limit (ACL) function that maximizes power efficiency under varying load conditions.

The UC3846QTR also includes various protection features, such as over-temperature, over-current, and over-voltage protection, providing robust operation for applications requiring these features. It is also capable of sustaining a high level of switching frequency and has a programmable frequency range from 25 kHz to 1 MHz.

The UC3846QTR works by using a Pulse Width Modulation (PWM) output to drive a power device. This PWM output is controlled by the internal current limit and voltage feedback signals. The device can be programmed to use voltages or currents to establish either the on-time or off-time PWM signal of the device, depending on the programming. The internal current limit provides over-current protection and an adjustable current limit setting. The voltage feedback can be used to regulate the output voltage of the power device, based on an isolated feedback Trim resistor.

The internal soft-start and over-voltage protection features allow for extended voltage operation without system oscillation or catastrophic failure. When a DPWM output is enabled, the device will switch the power device on and off rapidly to maintain a safe output voltage level. The over-current protection will disable the DPWM output in the event of an over-current situation. The power device can be controlled over a wide range of frequencies from 25 kHz to 1 MHz.

In addition, the UC3846QTR provides phase-locked loop (PLL) circuitry, allowing for synchronization of multiple power stages for applications requiring higher power. The PLL can also be used to smooth the current limit and voltage feedback signals, as well as ensure proper PWM operation during large current or load jumps.

The UC3846QTR is a versatile, high-performance switching controller, which is suitable for a variety of low-power applications. Its features, such as voltage and current Limit, AccurateCurrent Limit (ACL) functions, and over-voltage protection ensures robust operation with improved system efficiency. It also offers an adjustable switching frequency range of 25 kHz to 1 MHz, which is suitable for high-frequency operations.

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