![]() Power blocks optimized for motor-drive applications are tested in a half-bridge configuration at a 50% duty cycle with a fixed output inductor. SOA curves in TI power block datasheets are derived from power loss and thermal data collected with the device operating in an application circuit, such as a synchronous buck converter. To help designers, TI provides SOA information for power blocks in a way that correlates with the intended application. As such, discrete FET SOA curves don’t work for power blocks. Unlike discrete MOSFETs, which fit into a multitude of applications, power blocks are optimized for use in switch-mode applications such as power supplies and motor drives. Figure 2 shows the datasheet SOA curve for the CSD19536KTT power MOSFET.įigure 2: Datasheet SOA of the CSD19536KTT power MOSFET Under these conditions, the FET is dissipating high power, which can lead to catastrophic failure if the SOA curve is violated. As explained in an earlier technical article, the SOA curves provided in TI’s discrete power MOSFET datasheets are for linear mode operation where drain-source voltage and current are present in the FET simultaneously. The purpose of this technical article is to illustrate the differences in how TI specifies SOA for single, discrete FETs vs. #Power blocks driver#A power stage adds a driver integrated circuit to the power block.įigure 1: TI’s definition of power blocks and power stages As shown in Figure 1, a power block integrates control and synchronous FETs in a half-bridge configuration. New integrated devices such as power blocks and power stages require a different way to specify SOA. ![]() In power semiconductors, design engineers use the safe operating area (SOA) to determine whether it’s possible to safely operate a device such as a power metal-oxide semiconductor field-effect transistor (MOSFET), a diode or an insulated-gate bipolar transistor (IGBT) at current and voltage conditions in their application without causing damage to itself or nearby devices. Other Parts Discussed in Post: CSD19536KTT, CSD87353Q5D ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |