UCC2809PTR-2G4

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The UCC2809PTR-2G4 is a member of the UCC2809 family of integrated power supply controllers. It is a high-performance, pulse-width modulated (PWM) dc-dc converter integrated circuit,which includes a 2.5 A current limited switch for off-line, low power applications. It is a fixed frequency, current-mode PWM controller featuring protection from input overvoltage, overcurrent, and power-limit conditions. The UCC2809PTR-2G4 offers a wide input voltage range of 7V to 42V, making it suitable for low power applications such as ac adapters, battery chargers, and power supplies.

The device integrates a safety-enhancement feature per the International Electrotechnical Commission (IEC) 60950-1 standard to protect against faulty end equipment. The safety-enhancement feature is activated when a short-circuit event is detected at the output. Some external components are required to complete the circuit. This device also features a power-limit comparator, a PWM oscillator and fault protection, including UVLO and brownout protection.

The UCC2809PTR-2G4 application field includes a huge realm of potential employment opportunities. This device can be utilized for rugged, low-voltage applications such as cell phone chargers and other portable or stationary power supplies. It can also be used in AC/DC switching adapters, battery chargers, lighting control and motor control systems requiring medium- to high-voltage operations. This device is also a viable choice for UPS solutions. Thanks to the low standby current and internal thermal-shutdown protection, these controllers are ideal for a variety of safety-critical applications.

Working Principle

The UCC2809PTR-2G4 is a monolithic Pulse Width Modulated (PWM) current-mode controller designed specifically for flyback converters and offset converters. The output power stages are complemented with integrated features such as short-circuit protection including latching, under-voltage lockout (UVLO), over-current protection (OCP), external frequency setting, dual high- and low-side current limit, ove-voltage protection (OVP) and IC-level thermal shutdown (TSD).

The UCC2809PTR-2G4 utilizes a current-mode control to generate a PWM signal from the sensing of the output current, eliminating the need for an error amplifier. This allows for simpler designs and faster transient response. The on-chip current-sense comparator senses the current (either in the high-side or the low-side) and when it exceeds the threshold, the power stage is turned off. This comparator has a wide range of adjustable current limit thresholds, making it suitable for various applications.

The UCC2809PTR-2G4 features an external frequency setting option to optimally set the PWM switching frequency with respect to output power, ripple, EMI and efficiency. It also provides a comprehensive set of protection features to ensure system reliability, including UVLO, OVP and OCP. In addition, the device offers an internal thermal shutdown function which helps prevent over-temperature operation.

The UCC2809PTR-2G4 is designed to operate with a minimum start-up voltage of 7 V and a maximum output current of 2.5 A. The device is capable of operating from a wide voltage range, up to 42 V. This makes it ideal for a variety of low-power applications, such as an adjustable output step-down converter, a linear post regulator, a battery charger, or an AC/DC switcher.

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