Driver IC Subdues Level-Shifting Losses In Active Clamp Flybacks And Other Applications

Focus:

This article describes the application of the NCP51530 high-side low-side driver in a 60-W USB Power Delivery (PD) adapter design based on the active-clamp flyback (ACF). This driver reduces the level-shifting losses that have previously hindered application of the ACF in adapter designs. In this design, the NCP51530 is paired with ON’s NCP1568 PWM controller which overcomes another ACF problem—excessive losses in standby. The article begins by providing some background on the driver IC and explaining operation of the example ACF-based adapter design. It then compares the performance of the NCP51530 with two industry standard drivers. It presents loss calculations for the NCP51530 in the adapter application. Practical thermal results for the NCP51530 versus the two competitors in an ACF application are then presented. After that, efficiency data for an ACF board using the NCP51530 is compared against data obtained with the two competing parts.

What you’ll learn:

• How to implement efficient ac adapter designs based on the active-clamp flyback topology
• How to reduce level-shift losses in ZVS topologies like LLC half-bridge converters, full-bridge converters, active-clamp flybacks, two-switch forward converters, etc.

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Author & Publication:

Dhruv Chopra, ON Semiconductor, Phoenix, Ariz., How2Power Today, Nov 15 2018

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