At the PowerSystems World Power Electronics Technology Exhibition & Conference held recently in Chicago, Infineon Technologies introduced a single-package integrated switch that allows designers of switching power supplies to reduce system costs and the space required.
To reduce complexity and save time, power designers increasingly rely on integrated solutions for the driver and the power stage of the converter. However, such 'integrated switch' products typically use specialised and costly packaging to achieve the required electrical performance.
Infineon's new TDA21201 Integrated Switch devices convert a 12 V input into levels of less than 3,5 V to power the variety of components within personal computers, peripherals and other electronic systems. It combines a gate driver and two OptiMOS power MOSFET switches in a single industry-standard TO220 package that requires only input and output filters and a PWM (pulse-width modulation) controller to create a complete dc-dc voltage converter for applications in which space is a significant constraint and power dissipation is a concern.
The low-cost package types available from Infineon are the surface-mount TO220-7-128 (D2-PAK) and the through-hole TO220-7-3 (straight-lead) and TO220-7-230 (staggered-lead) packages. The D2-PAK package dissipates heat generated by the device directly into the board, while the other two packages allow the heat to be dissipated into the air.
Combining the power MOSFETs and the driver circuit in a single package also virtually eliminates stray inductances between the semiconductor components, resulting in lower switching losses and a more compact design. The packaging density enables higher board densities for multiphase converters, making it feasible to package a three- or four-phase converter in the space usually required for a two-phase design.
The TDA21201 is highly efficient, achieving over 80% efficiency at a 200 kHz switching frequency for currents of 20 A. It accomplishes this in large part because of the reduced static and dynamic losses made possible by the proprietary OptiMOS technology used in the MOSFETs. The MOSFETs can handle currents of up to 30 A and have breakdown voltages of 30 V, which allows them to avoid avalanche during turn-off of the HS (high-side) MOSFET. The drive capability of the gate driver allows the TDA21201 to be operated in the frequency range of 100 kHz to 500 kHz.
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