Peak efficiency at 99%, 585-W high-voltage buck reference design with standard Si-MOSFETs
PMP30446
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Key Document

Description

This reference design converts a DC-input source in the range of 450 V to 780 V into non-isolated 390 V at 1.5 A. This is an alternative solution to SiC-FET and SiC-Diode buck converter, since the actual power stage uses only standard silicon components. In order to employ 600 V rated devices, the input source has been split so that two identical buck stages share the center point. A single coupled inductor (1:1) balances automatically the center point. Two small-series inductors limit the current in each branch in case of voltage imbalance and any small variation in the gate drive delay time of the two FETs. The converter minimizes the switching loss as a result of CRM mode (critical conduction mode), achieving peak efficiency of 99% at 450 V input voltage and full load.

Features
  • Overall efficiency of 98% at full load with peak efficiency at 99%
  • Non-SiC silicon components used to lower overall BOM cost
  • No heat sink is necessary due to very high efficiency
  • Self-balancing center point thanks to coupled inductor

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Parametrics
 PMP30446.1
(Output Voltage 1)
Vin (Min) (V)450
Vin (Max) (V)780
Vout (Nom) (V)390
Iout (Max) (A)1.5
Output Power (W)585
Isolated/Non-IsolatedNon-Isolated
Input TypeDC
TopologyBuck- Non Sync

TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
LM4040  Fixed voltage, 45-µA, precision micropower shunt voltage reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
UCC21220A  4-A/6-A, 3.0-kVRMS dual-channel isolated gate driver with 5-V UVLO  Gate drivers  Sample & Buy View Design Kits & Evaluation Modules
UCC28051  Transition mode PFC controller with 12.5V/9.7V UVLO and IEC61000-3-2 compliance, -40°C to 85°C  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules
UCC28710  Constant-voltage, constant-current PWM with PSR, valley switching & Programmable cable compensation  Offline & isolated DC/DC controllers & converters  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
LM4040 Download
Download
Download
SN6501 Download Download
UCC21220A Download
UCC28051 Download Download
Download Download
UCC28710 Download

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Technical documentation

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User guides (1)
Title Type Size (KB) Date
PDF 1070 24 Apr 2020
Design files (6)
Title Type Size (KB) Date
ZIP 117 24 Apr 2020
ZIP 1016 24 Apr 2020
PDF 1411 24 Apr 2020
PDF 347 24 Apr 2020
PDF 137 24 Apr 2020
PDF 345 24 Apr 2020

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