SG2525AP

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SG2525AP is a PWM current mode, voltage mode and auto-skipping switching controller IC. It can provide multiple output mode, phase shift, QR and SR options. The device output is independently adjustable, and the 45V power amplifier can be integrated. The device also provides a variety of protection functions, such as overload protection, over temperature protection, MOS protection, current limiting, and so on.

The SG2525AP is suitable for a variety of power management applications, such as home appliances, office automation and industrial control.

Application FIeld

1. Offline AC/DC Converter: SG2525AP is a practical and economical offline ac-dc converter topology solution for a variety of ac-dc applications, ranging from cost sensitive lighting applications or white goods to cost-effective applications;

2.Charging and Power Supply: The SG2525AP used in the power supply system, such as lead-acid battery charger, Ni-MH battery charger, solar power supply, UPS power supply for the power management system, etc.;

3.Communications and Other Equipment: SG2525AP also applied to the power supply system design of communications and other equipment, such as modem, set-top box, broadband router, etc.

Working Principle

The SG2525AP is a high frequency switching power supply controller that uses pulse-width modulation (PWM) to generate output voltage. The power feedback from the output is compared with the reference voltage to adjust the pulse width to maintain the correct output voltage. The SG2525AP is designed to work with a high frequency power transistor, such as MOSFET, IGBT or BJT. It generates a high-frequency switching current and voltage by applying PWM control in the power circuit.

The working process of the SG2525AP is as follows: When the input DC voltage is applied, a constant voltage is detected by the voltage regulator in the controller to turn on the power switch. At this time, the power switch is in the on-state, and the current will begin to flow through the inductor. The current stored in the inductor gradually increases to energy storage level. When the energy storage level reaches the set value, the controller turns off the power switch to switch the circuit status and make the inductor output the stored energy.

At the same time, the output voltage feedback loop will compare the output voltage with the reference voltage to generate a voltage error signal. The voltage error signal is compared with the oscillator to produce the pulse-width modulation (PWM) signal for controlling the power switch on and off, which ultimately maintains the output voltage at the specified level. The cycle continues above.

Protection

The SG2525AP also provides a variety of safety features to protect the system, including over-current control, over-temperature protection, and MOSFET PSP (Protection-Rapid Switching Protection) protection. When the over-current protection device is activated, the output voltage of SG2525AP will be disabled, and after the over-current protection device is reset, the output voltage of SG2525AP can be re-enabled automatically and continue working to protect the system.

In addition, the SG2525AP also provides a soft start function, which can mitigate the inrush current generated when the power is turned on. This can ensure a smooth and constant start of the power supply, reduce the peak current on the transformer, and increase the life of the transformer.

To sum up, the SG2525AP is a practical and economical solution for the power management system, and its protection and auto-skipping features make it an ideal choice for a variety of safety-sensitive applications.

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