TOP252GN-TL

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The TOP252GN-TL, which belongs to the PMIC - AC DC Converters, Offline Switchers family, is a high performance, cost-effective, easy-to-use, fixed frequency synchronous off-line switcher IC. It is designed for universal offline, non-isolated, AC-DC applications. With the convenience of just terminal blocks, plus the low cost of push/pull outputs. The TOP252GN-TL is the ideal solution for open frame, wall adapter, and power supply applications.

The TOP252GN-TL features a fixed frequency current-mode PWM control scheme and integrated high side MOSFET and low side power MOSFET to provide excellent line and load regulation. The light load efficiency is improved by the low current control architecture which eliminates the tail current loss during switching transitions. Other features include hiccup mode of protection for both over-voltage and over-current, an over-temperature protection circuit, as well as an on-chip soft-start circuit.

The TOP252GN-TL application field includes open frame power supplies, wall adapters, USB chargers, Lighting applications, Iron circuits and more. It has a wide operating temperature range from -40°C to +85°C and a low external component count for easy design. With the wide input voltage range of 8V to 30V, the wide operating frequency range of 52kHz-200kHz,and two output voltage grades of +/-2.5V to +/-18V, this part is suitable for many different applications.

The working principle of the TOP252GN-TL is based on current-mode Pulse Width Modulation (PWM) control. The output voltage regulation is achieved by using an error amplifier comparing the voltage feedback to the internal reference voltage. When the output voltage deviates from the reference value, the error amplifier output varies the duty cycle of the PWM waveform. The PWM waveform control signal drives the high side power MOSFET and low side power MOSFET as a synchronous rectifier bridge for energy conversion.

In summary, the TOP252GN-TL is a high performance, cost-effective, easy-to-use fixed frequency synchronous off-line switcher IC. It is designed for a wide range of applications from open frame power supplies, wall adapters, USB chargers to lighting applications, and its working principle is based on current-mode Pulse Width Modulation (PWM) control.

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