LNK564DG

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The LNK564DG is a highly integrated off-line switcher IC ideal for isolated Watt-level power supplies found in consumer, industrial, and appliance applications. The universal critical conduction mode (CRM) provides improved light load efficiency and EMI performance, whilst the pulse width modulation (PWM) provides line feed-forward and fast frequency fold-back for faster transient response. The LNK564DG offers an extremely tight regulation window, the dynamic line or loading compensation and the benefit of a low-cost external C-R filter.

The LNK564DG\'s main application field is AC/DC Converters, Offline Switchers. This technology is exceptionally useful for variable output voltage control, as well as in motion controller applications. It also features a current mode (CM) control scheme, which simplifies design complexity and reduces system costs. The switching frequencies of the device can range from 65kHz to 1MHz, depending on the specific use-case.

In addition, the LNK564DG is equipped with an embedded pulse-by-pulse current limiting protection which makes it ideal for applications requiring converters with robust over-current protection. It also includes cycle-by-cycle over temperature protection to prevent damage of the integrated power devices.

The LNK564DG\'s working principle is quite simple. Upon system start-up, a small startup current ramp is generated by the integrated charge pump. This charges an internal bootstrap capacitor, which connects the internal top-side MOSFET to ground and keeps it turned on in the steady-state. The current is then ramped up to a set point and the output voltage is regulated by varying the duty cycle of the switching device.

The device can detect near short-circuit conditions, undervoltage and overvoltage conditions, too. During the operation the voltage feed-forward and frequency fold-back modulation will decrease the output response time and dead-band, which improves the power supply\'s transient response and stability. The LNK 564DG is also capable of soft-start, under-voltage lockout, over-voltage protection and cycle-by-cycle current limiting.

The LNK 564DG is a highly integrated off-line switching IC which is ideal for low power (Watt-level) applications in consumer, industrial, and appliance markets. It offers tight control window, improved light-load efficiency, improved EMI performance, line-feed-forward, and frequency fold-back for faster transient response. With an easy-to-use power supply design, the device can provide reliable, efficient, and cost-effective power conversion.

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