Renesas' 40V multi-output isolated topology demonstration platforms use a single synchronous buck converter to realize multiple outputs (both inverting and non-inverting) as well as voltage step up/down function.

Board Base
Product
Topology VIN
range
default
VOUT
Max
IOUT
Switching
Frequency
User
Guide
ISL85413DEMO3Z ISL85413 Isolated Buck 9 to 40 +5V, -5V +150mA/
-150mA
Internal 700kHz ISL85413DEMO3Z User Guide (PDF)
ISL85415DEMO2Z ISL85415 Isolated Buck 5 to 36 +3.3V, +3.3V IMAX = 300mA Internal 500kHz/
External 300kHz to 2MHz
ISL85415DEMO2Z User Guide (PDF)
ISL854102DEMO2Z ISL854102 Isolated Buck 19 to 36 +12V, +12V, -12V +800mA/
+150mA/
-150mA
Internal 500kHz/
External 300kHz to 2MHz
ISL854102DEMO2Z User Guide (PDF)
ISL85415EVAL2Z ISL85415 Inverting
Buck-Boost
3 to 31 -5V IMAX = 500mA Internal 500kHz/
External 300kHz to 2MHz
ISL85415EVAL2Z User Guide (PDF)
ISL854102DEMO3Z ISL854102 Isolated
Buck-Boost
3.5 to 35 -5V, +5V +500mA/
-500mA
Internal 500kHz/
External 300kHz to 2MHz
ISL854102DEMO3Z User Guide (PDF)

About 40V Multi-Output Isolated Topologies

Many applications require multiple voltage rails and are often limited by cost, footprint and height. In addition, ease of implementation and reduced complexity are often favored. As opposed to using multiple DC/DC converters to generate multiple outputs, which adds complexity to the circuit, additional voltage rails can be generated by using coupled inductors or transformers in place of the single filter inductor using isolated converter topologies.

Besides using coupled inductors or transformers to generate additional inverting or non-inverting voltage rails, the buck converter can be configured into an inverting buck boost converter. In this respect, an additional advantage of having a voltage step up function can be obtained in addition to having an inverting output. We will demonstrate how to use a single synchronous buck converter to realize multiple outputs (both inverting and non-inverting) as well as voltage step up/down function.

Galvanic isolation and multiple output applications are common in various power electronic applications, such as telecommunication applications, industrial programmable logic controllers (PLCs), industrial factory automation, isolated communication interfaces (i.e. RS-485, RS-232), bias supplies for gate drives, sensors, op-amps, motor drive applications and any application that requires positive and negative rails.

Applications

Industrial

  • Factory/Industrial automation system 
  • PLC and I/O modules
  • Building automation
  • Motor drives
  • Smart meters
  • Isolated power supplies for medical equipment
  • Isolated fieldbus interface
  • Smart grid

Communications

  • IP phone
  • PoE IP camera
  • DC/DC converter modules

Topologies

Isolated Buck Topology

Isolated Buck Topology

Inverting Buck-boost Topology

Inverting Buck-boost Topology

Isolated Buck-boost Topology

Isolated Buck-boost Topology

文档和下载

文档标题 其他语言 类型 文档格式 文件大小 日期
应用指南 &白皮书
How to Reconfigure a Buck Converter for Multiple Outputs 白皮书 PDF 468 KB