UCC2808APW-2G4

The UCC2808APW-2G4 is a monolithic, pulse width modulation (PWM) control IC designed for switch-mode voltage regulator applications. It provides precise logic and timing control of power switching devices with minimal external parts count.The UCC2808APW-2G4 features Maximum Duty-Cycle control, an adjustable output voltage (Vout) reference, and pinned-out delay time-constants for compensation.

UCC2808APW-2G4 application field and working principle

UCC2808APW-2G4 switch-mode power supply (SMPS) controller ICs can be used in various applications, such as ac-dc power adapters and chargers, desk-top, server and notebook power supplies, mobile phone chargers, motor control and lighting control.

The working principle of the UCC2808APW-2G4 is that it uses an internal oscillator to generate a fixed frequency of pulses and controls the duty cycle of the output by comparing the internal oscillator signal and the voltage output feedback voltage. On the one hand, the high level of the output pulse is used to turn on the switch tube, while the low level is used to turn off the switch tube. On the other hand, the output feedback voltage is sent to the error amplifier, and the error amplifier passes the signal to the logic circuit for comparison, and then controls the pulse width of the output pulse.

In addition, the UCC2808APW-2G4 has a maximum duty cycle control pin, which is used to limit the maximum duty cycle. If the duty cycle is too high, the output voltage will be too high and the load current will be limited. The maximum duty cycle can be set by connecting a resistor from the MAX DC pin to ground, and adjusting the resistor value to get the desired duty cycle.The UCC2808APW-2G4 also has two pins to set the output voltage reference. By connecting the voltage divider output to the Vout pin, and the output feedback voltage to the FB pin, the output voltage can be changed.The UCC2808APW-2G4 also has several pins for compensation. By connecting the appropriate external resistance and capacitor, the stability and performance of the system can be greatly improved.

Conclusion

In summary, the UCC2808APW-2G4 is a monolithic, pulse width modulation (PWM) control IC designed for switch-mode power supply applications. It has a number of features including a Maximum Duty-Cycle control, an adjustable output voltage (Vout) reference, and pins for compensation resistance and capacitor connection. The UCC2808APW-2G4 is suitable for a wide range of applications, including ac-dc power adapters and chargers, desktop and notebook power supplies, and motor and lighting control.