TOP242PN

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Power management integrated circuit (PMIC) is the heart of a device’s power system. It is the technology that allows modern portable devices such as cell phones, laptops and tablets to become so small and power efficient. The TOP242PN is an advanced offline switcher designed for use in multiple applications, including mobile phones, mobile internet devices, and other portable electronic products. It is a PWM current-mode controller which helps in optimizing power utilization with high efficiency, thereby reducing system cost.

AC-DC Conversion

The TOP242PN device integrates high-side and low-side power switches and drives the power switch synchronously. The AC power is transferred to the output DC voltage through rectification and filtering, rectified voltage is applied to the vin of TOP242PN and the output DC voltage is regulated by the PWM regulation function of the TOP242PN.

The TOP242PN has various built-in short-circuit protection functions. The output current comes with multiple levels of protection. If an overload situation occurs, the device will limit the output current and resume normal condition after the output current has returned to its normal value circuit protection pin is connected to an external resistor to realize over temperature protection. The graphic below shows the main parameters of AC-DC conversion application.

Offline Switchers

Offline switchers is a switching power supply designed to operate from a wide range of AC line voltage from 90 ~ 295V. The TOP242PN is an offline switching device based on a current-mode control architecture. It has the ability of limiting the peak output current to prevent overloading. The power switch optimizes power utilization and maximizes efficiency for small form factor products. The TOP242PN supports external synchronized rectification for high power systems, which provides a cost and size effective solution.

By incrementing the resistance at the current limit pin, the user can set up a limited peak current in order to reduce switching and standby power losses. The signal oscillates between high and low states at the set frequency to create switching, allowing control current to flow the power switch.

Working Principle

The working principle of the TOP242PN is based on current-mode control. The output current is compared with the current limit by the current mode control circuit, and the voltage output of power switch is regulated through controlling the PWM duty cycle. There is an external resistor connected between FB pin and ground, which will produce a feedback signal to the error amplifier, and then the error amplifier adjusts the output voltage to a desired level by means of a PWM signal.

The TOP242PN has multiple built-in operational protection functions, including over voltage protection (OVP) to protect draining too much power, over temperature protection (OTP) to limit heat generated, under voltage lockout (UVLO) to prevent system from draining too much power, and current limit protection (CLP) to protect system from overloading. It is important to select the right parameters to balance system performance and safety considerations.

Conclusion

The TOP242PN is an advanced PWM current-mode controller designed for use in multiple applications, including AC-DC converters and offline switchers. It helps in optimizing power utilization with high efficiency, thereby reducing system cost. The TOP242PN integrates short-circuit protection functions, limiting the peak output current to prevent overloading. The device supports external synchronized rectification for high power systems, which provides a cost and size effective solution. It is important to select the right parameters to balance system performance and safety considerations.

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