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