UC2577TDTR-ADJ

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The UC2577TDTR-ADJ, manufactured by Texas Instruments, is a preprogrammed, adjustable, low nearly-constant-on-time (COT) PWM control IC designed to provide adjustable fixed-frequency and duty-cycle with constant on-time control. It is designed to be used as a Pulse Width Modulated (PWM) switching regulator embedded in a DC-DC buck converter to provide efficient and precise current control. The UC2577TDTR-ADJ is classified as a PMIC (Power Management IC) Voltage Regulator, belonging to the DC-DC Switching Regulators category.

The UC2577TDTR-ADJ combines a fixed frequency voltage-mode PWM current-mode (VCM) controller with a low time-on (COT) driver for a buck converter. This IC is suitable for low component count step-down converters. The UC2577TDTR-ADJ\'s input voltage range is 3.4V to 40V and its output range is 0.6V to 38V. It includes an adjustable oscillator frequency, adjustable soft-start time, adjustable low time-on (LT) time, adjustable UV/OV thresholds, adjustable UV/OV hysteresis, and adjustable over-voltage protection circuitry. It has a power saving burst mode with a 10uA shutdown current and adjustable hysteresis to maximize efficiency.

The working principle of the UC2577TDTR-ADJ is based on a constant-on-time (COT) PWM control method. This PWM controller is based on a current-mode control loop and dynamic on-time control, which are combined to maintain the output voltage. A voltage across a sense resistor tied to one of the drain terminals is sensed by the sensed input. The sensed current waveform is then compared with an internal reference voltage and an error signal is generated. This error signal is then amplified and used to modulate the switching waveform of the power switch output to control the current waveform and to keep the output voltage constant.

The UC2577TDTR-ADJ is designed with a wide range of features to effectively control the voltage regulation in DC-DC buck converter applications. Its PWM control is based on a constant-on-time (COT) architecture which results in high power efficiency and good line and load regulation. The adjustable oscillator frequency allows the user to optimize the converter’s response for light or heavy load conditions. The adjustable soft-start time prevents inrush current and out-of-control transients. The adjustable over-voltage protection circuitry prevents the system from being subjected to high voltage conditions. The adjustable low time-on (LT) time provides additional protection from output over-voltage conditions. Finally, the adjustable UV/OV thresholds allow for improved efficiency and current control at light loads.

The UC2577TDTR-ADJ is a high-performance PWM control IC with adjustable frequency and duty-cycle that is suitable for low component count step-down converters. This IC is designed to provide adjustable, nearly-constant-on-time (COT) control with adjustable soft-start, over-voltage protection circuitry, adjustable UV/OV thresholds, and adjustable low time-on (LT) time. The UC2577TDTR-ADJ is classified as a PMIC (Power Management IC) Voltage Regulator and is part of the DC-DC Switching Regulators category.

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