UCC25600DRG4

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UCC25600DRG4 Application Field and Working Principle

UCC25600DRG4 is a single-channel, high-performance PWM controller that belongs to the DC-DC switching controllers category under PMIC (Power Management Integrated Circuit). It is an advanced high-frequency PWM control circuit that uses an external compensation capacitor and an external inductive feedback circuit to generate high-speed PWM switching signals which are used to control DC-DC conversion and output active power supports.

Features

• Wide input range (6V to 19V)
• Low reference voltage allows lower external series resistor
• High frequency operation up to 500kHz
• Programmable under-voltage lockout
• Programmable deadtime
• Programmable soft start
• Programmable peak current detection

Application

UCC25600DRG4 single-channel, high-performance PWM controller is suitable for applications which require fast switching and precise control, such as DC-DC power converters and automotive components. It can be used to control and protect DC-DC converters by providing active current limitation and over-temperature protection. Other applications include on-board chargers, laptop adapter and AC/DC adapter.

Working Principle

UCC25600DRG4 features high-speed operation up to 500 kHz which requires an external highly precise external inductive feedback circuit. The main purpose of the external inductive feedback network is to provide an independent feedback voltage that is proportional to the output voltage of the DC-DC converter. When the output voltage of the converter falls below a certain threshold, the feedback voltage increases and triggers the pulse width modulation (PWM) stage, causing the converter to increase its output voltage. On the other hand, when the output voltage of the converter is above the threshold, the feedback voltage decreases and triggers the PWM stage, causing the converter to decrease its output voltage accordingly.

The speed of the PWM control cycle is determined by an external compensation capacitor and resistor. This capacitor and resistor form an RC circuit that is connected to the two PWM inputs. When the voltage drop across the capacitor reaches a certain threshold, the oscillator is triggered and the cycle begins. During the period of time that the PWM is triggered, the voltage on the output of the converter is regulated until the voltage across the compensation capacitor reaches the threshold voltage.

Apart from controlling the output voltage of the DC-DC converter, the UCC25600DRG4 single-channel, high-performance PWM controller also supports current limitation and over-temperature protection. This is achieved by programming the peak current detection, under-voltage lockout, deadtime and soft start parameters.

Conclusion

The UCC25600DRG4, a single-channel, high-performance PWM controller, belongs to the DC-DC Switching Controllers category under PMIC (Power Management Integrated Circuit). It is suitable for applications requiring fast switching and accurate control, such as DC-DC power converters and automotive components. The working principle of the UCC25600DRG4 is based on the external highly precise inductive feedback circuit. It is able to activate the PWM stage which in turn increases or decreases the output voltage of the DC-DC converter accordingly. Furthermore, the UCC25600DRG4 also supports current limitation and over-temperature protection.

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