Details

Panjit's flyback controller is ideal for many applications like power adapters and auxiliary power

Panjit’s resonant flyback controller employs a unique control strategy that ensures both the high-side and low-side MOSFETs achieve nearly zero voltage switching (ZVS). This minimizes switching losses and optimizes efficiency. By utilizing SJMOS power devices and traditional flyback system materials, it enables the creation of high-efficiency, high-power-density flyback power systems. Additionally, the controller is compatible with GaN and SiC technologies for higher-frequency power system designs.

Quasi-resonant switching, compared to traditional continuous and discontinuous modes in a flyback converter, reduces turn-on losses at the power switch, thereby increasing efficiency and lowering device temperatures. The drawback of higher losses at light loads is mitigated by the frequency-clamp circuit in modern controllers and integrated power switches.

A crucial aspect of power supply unit (PSU) design is delivering power safely and efficiently. Panjit products are commonly used on both the primary and secondary sides of power systems. Power factor correction (PFC) structures are essential for improving power quality and must adhere to international standards such as Energy Star, 80 Plus®, and ErP Lot6. When designing a PSU circuit, it is vital to consider the power factor and ensure the PFC structure meets the required standards.

The combination IC integrates power factor correction (PFC) and quasi-resonant flyback functionalities, essential for creating a compact and highly efficient switched-mode power supply for adapter applications. The PFC stage achieves near-unity power factor while operating in Critical Conduction Mode (CrM) with a maximum frequency clamp. It includes all necessary features for constructing a robust and compact PFC stage while minimizing external components. The quasi-resonant forward circuit, utilizing transformer leakage inductance and a resonant capacitor, generates nearly sinusoidal currents during the switch on-time, significantly reducing primary switching stress.

Features

• High-side MOSFET integrated
• ZVS for low-side and high-side switches
• Optimal efficiency and power density
• Power supply applications from 30 W to under 150 W
• Suitable for GaN or SiC applications
• Ultra-low no-load consumption: <30 mW

A Power Supply Unit (PSU) is the primary power source for electronic devices. With the increasing emphasis on energy saving and carbon reduction, international regulations on product power consumption are becoming stricter. Whether for power chargers for low-voltage mobile devices or high-performance UPS and server power supplies, the requirements for devices include low power consumption, high performance, and high reliability, regardless of whether an AC-DC conversion topology or DC-DC brick power is used. Panjit offers a comprehensive range of discrete devices essential for various power supply design solutions. Panjit's SMT bridge and low FOM MOSFET products enhance power density, while Panjit's ESD protection components and TVS protect power management ICs from damage caused by external surges.

PD Charger / Power Adapter

The trend of light, thin, high performance and fast charging speed.

Server Power

The increasing demand for cloud computing, IoT facilities, and smart transportation systems is causing the scale, density, and number of data centers around the world to grow exponentially.

DC-DC Brick

Small size and high efficiency are the main features of DC-DC brick power. Design engineers can easily solve the space and time issues they face when designing due to these features.

UPS

UPS systems are used in various fields to ensure the provision of stable and continuous power in case of emergencies. These fields include industrial manufacturing plants, telecommunications, data centers, medical equipment, and large shopping malls, etc.

DRFLYBACK-A

An AC-DC controller is used to convert AC power into stable DC power. Initially, the AC input is rectified into a high DC voltage. A flyback controller, a simple switch-mode converter for AC to DC, functions similarly to a buck-boost converter but utilizes separate inductors to form a transformer. This transformer allows for input and output isolation. The flyback controller is versatile, suitable for applications ranging from small charger adapters (power adapters) to power supplies up to 150W.

The basic structure is a flyback design that uses transformer leakage inductance to create a resonance-like effect. This resonance results in a sine wave voltage waveform, enabling the MOSFET to be turned on at the trough of the sine wave. At this point, the VDS across the MOSFET's drain and source is minimized, reducing switching loss and achieving high efficiency. As a soft-switching converter, it requires only small EMI filters.

Panjit's QR Flyback controller integrates a high-side MOSFET and supports switching MOSFETs to operate in Zero Voltage Switching (ZVS) mode. With its advanced features, the Panjit QR Flyback controller can support devices with power ratings up to 150W.

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