LNK6428K

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The LNK6428K is a performance power monitor IC (PMIC) that exhibits high efficiency, ruggedness, and reliability in AC/DC offline switcher applications. It features a very low input current, wide input voltage range, and robust protection features.

The LNK6428K integrator applies advanced control techniques, including short-circuit protection, over-current protection, over-voltage protection, and under-voltage shutdown. These features make the LNK6428K PMIC suitable for applications that require reliable and safe power supply, including three-phase drive systems, photographic equipment, home appliances, camping equipments, ITE, and office appliances.

The key applications of the LNK6428K are mainly in the following categories:

• AC/DC offline switchers
• Power factor corrected AC/DC switchers
• AC coupled DC/DC step-down converters
• Power-monitoring equipment

The working principle of the LNK6428K is based on the line-operated topology with a current-mode control scheme. The device is based on a bidirectional, line-operated forward-mode converter and modulates power factor through the manipulation of the output voltage. The monitoring features such as over-voltage, over-current, and short-circuit protection provide the designer’s concept. Additionally, the LNK6428K provides several features such as efficiency muting, enable/disable and fault feedback.

The device integrates all necessary components for a complete AC-DC switcher, including a control loop, high- and low-side power MOSFETs, an optocoupler, over-voltage, over-current, and short-circuit protection circuitry. Its wide input voltage range supports both 115V and 230V AC. This architecture includes a low-cost, non-isolation transformer and thus it enhances the power conversion from AC to DC with high power factor and low THD. This provides reliable performance and high efficiency.

In summary, the LNK6428K is a power monitoring IC that can be applied in AC/DC offline switchers. The device provides several features such as short-circuit protection, over-current protection, over-voltage protection, and under-voltage shutdown. Its wide input voltage range supports both 115V and 230V AC and its current mode control architecture is suitable for low cost, non-isolation transformers. Thus, the device offers reliable and safe power supply, making it suitable for applications including three-phase drive systems, photographic equipment, home appliances, camping equipments, ITE, and office appliances.

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