INN2904K

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INN2904K, as a component within PMIC (Power Management Integrated Circuit) is an AC/DC Converter or offline switcher, which has a wide application field. For those designs where space constraints, dense component count and high performance requirements exist, the IC is ideal.

The IC can output currents up to 5A, with no heatsink necessary, while the power rating is up to 60W. As long as PCB layout is fully optimized, the device can be operated up to 12W, without the need for a heatsink. The overall power component size is quite small and reaches 6mm x 8mm x 1.4mm which makes mounting it easier to the PCB. In addition, the component temperature will remain relatively low under any circumstances.

Working Principle:

The INN2904K converts the AC or DC power supply into a DC output current. The input and output transformers are compact while being highly efficient and eliminating the need for multiple components. The construction of the transformer also reduces EMI, making the device ideal for applications where noise needs to be reduced.

The device contains an optimized, patented DRV-containing energy recovery network which ensures fast transient response, low on-resistance, low losses and a small overall footprint. In addition, the device comes with integrated ESD protection, PIN protection, an active overvoltage protection function, a soft-start circuit, an output voltage ramp controller, as well as an adjustable oscillation mode.

By using sophisticated current sensing techniques, the device can support wide input voltage ranges, from 7V to 28V and output from 1.5V to 24V. Depending on the application, the device can be operated at a fixed frequency up to 500KHz, reducing the overall switching losses.

The high-voltage driver has integrated high frequency FET and functions at high speeds, with a very low propagation delay. The device requires an external resistor which sets the operating temperature range. The IC also incorporates an additional integrated output power transistor.

In addition, the IC includes an integrated fusible link to protect the supply path and ensure safety, when the power supply is disconnected or otherwise interrupted. The link can withstand up to 30V on its leads without any external protection.

Conclusion

INN2904K is basically an off-line switcher with integrated Energy Recovery features, designed to provide the highest possible power efficiency. The device offers a wide range of features including ESD protection, PIN protection, active overvoltage protection, soft start, adjustable oscillation and more. The IC is also compact and comes with an optimized transformer, making it ideal for applications requiring high performance and a small overall footprint.

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