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reference designUCC33421DHAR | Demoboard TIDA-010957

Texas Instruments UCC33421DHAR | Demoboard TIDA-010957

15kW, bidirectional, three-phase plus neutral flying capacitor based on GaN reference design

Overview

TopologyBuck-Boost Converter
Input voltage4.5-5.5 V
Output 15 V / 0.3 A

Description

This reference design provides a design template for implementing a three-level, three-phase plus neutral, Gallium Nitride (GaN) based flying capacitor power stage. The use of fast switching power devices allows switching at an equivalent frequency of 125kHz, reducing the size of magnetics for the filter and increasing the power density of the power stage. The multilevel topology allows the use of 650V rated power devices at higher DC bus voltages of up to 900V. The lower switching voltage stress across the transistors reduces the switching losses, resulting in an efficiency of 98.9% at full power.

Features

  • Power stage for three-phase plus neutral bidirectional DC/AC converter
  • 650V rated switches in 900V system (due to three levels)
  • High switching frequency of 125kHz and high efficiency design (98.9%)
  • 21ARMS per phase
  • Control scheme that allows control of the unbalancing of three current phases

Typical applications

  • String Inverter, Onboard charger, DC fast charging station, Central inverter

More information

Parts approved by Texas Instruments

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L(µH)
IR(mA)
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74479763222
SPECWE-PMI Power Multilayer Inductor, 2.2 µH, 550 mA
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Status
ActiveProduction is active. Expected lifetime: >10 years.
iProduction is active. Expected lifetime: >10 years.
Product seriesWE-PMI Power Multilayer Inductor
Inductance2.2 µH
Rated Current550 mA
Rated Current 2800 mA
Saturation Current280 mA
DC Resistance300 mΩ
Self Resonant Frequency80 MHz
TypeLow RDC 
Height0.9 mm
Width0.8 mm
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