4-Switch buck-boost bi-directional DC-DC converter reference design PMP21529 (ACTIVE)

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Key Document

Description

This DC-DC power converter reference design demonstrates a novel approach for battery backup applications. During normal operation, the converter works as a battery charger with CC-CV-Topping charging algorithm compatible for lithium-ion batteries. When DC bus power is lost, the converter immediately changes to backup operation to seamlessly provide power to the system. Once the DC bus power recovers, the converter automatically switches back to battery charge mode. The battery voltage can be higher or lower than DC bus voltage. Depending on the DC bus and battery voltage, the converter operates as either a synchronize buck or a synchronize boost converter in which only two switches are switching, switching loss is reduced and high effieciency is achieved. Only when DC bus and battery voltage are close to each other, then the converter operates as a buck-boost converter.

Features
  • Multi-mode control to reduce switching loss and achieve high efficiency
  • Built-in battery charging CC-CV topping algorithm compatible for lithium-ion and lithium-polymer battery
  • Ultra-fast changeover from charging to backup supply mode enables seamless power transfer during power failure
  • DC-bus voltage can be higher or lower than battery voltage
  • Battery over voltage and over current protection, DC bus over voltage protection

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Schematic/Block Diagram

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Design Guide

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Design Files

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Parametrics
 PMP21529.1
(Output Voltage 1)
Vin (Min) (V)35
Vin (Max) (V)55
Vout (Nom) (V)38
Iout (Max) (A)2
Output Power (W)76
Isolated/Non-IsolatedNon-Isolated
Input TypeDC
TopologyBuck Boost- 4 Switch

TI Devices (5)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
OPA2211A  1.1nV/rtHz Noise, Low Power, Precision Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
TLV1117  Single Output LDO, 800mA, Fixed and Adj., Internal Current limit, Thermal Overload Protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
UCC27211A  120-V Boot, 4-A Peak, High Frequency High-Side and Low-Side Driver   Gate drivers  Sample & Buy Not Available
UCC3813-1  Low Power Economy BiCMOS Current Mode PWM  Offline & isolated DC/DC controllers & converters  Sample & Buy Not Available
UCD3138  Highly Integrated Digital Controller for Isolated Power with 3 Feedback Loops and 8 DPWM Outputs  Digital power  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
OPA2211A Download Download
Download -
TLV1117 Download -
Download
Download -
Download -
Download -
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UCC27211A Download
UCC3813-1 Download Download
Download Download
Download Download
UCD3138 Download
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Download Download
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Technical Documents

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User guides (1)
Title Type Size (KB) Date
PDF 734 12 Dec 2018
Design files (6)
Title Type Size (KB) Date
ZIP 679 12 Dec 2018
ZIP 1503 12 Dec 2018
PDF 1520 12 Dec 2018
PDF 281 12 Dec 2018
PDF 105 12 Dec 2018
PDF 276 12 Dec 2018

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