40V Multi-Output Isolated Topologies

Demonstration Platforms for the ISL8541x Family of Synchronous Buck Regulators

Intersil's  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.

Browse Products

Featured Boards

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
 
ISL85415DEMO2Z ISL85415 Isolated Buck 5 to 36 +3.3V, +3.3V IMAX = 300mA Internal 500kHz/
External 300kHz to 2MHz
 
ISL854102DEMO2Z ISL854102 Isolated Buck 19 to 36 +12V, +12V, -12V +800mA/
+150mA/
-150mA
Internal 500kHz/
External 300kHz to 2MHz
 
ISL85415EVAL2Z ISL85415 Inverting
Buck-Boost
3 to 31 -5V IMAX = 500mA Internal 500kHz/
External 300kHz to 2MHz
 
ISL854102DEMO3Z ISL854102 Isolated
Buck-Boost
3.5 to 35 -5V, +5V +500mA/
-500mA
Internal 500kHz/
External 300kHz to 2MHz
 

ISL8541x Product Family

Part Number Input Voltage (V) Output Current Compensation Switching Frequency Ext Sync Soft-Start Datasheet
ISL85412 3.5 to 40 150mA Internal Only Internal 700kHz No Internal isl85412.pdf
ISL85413 3.5 to 40 300mA Internal Only Internal 700kHz No Internal isl85413.pdf
ISL85415 3 to 36 500mA Internal/External Internal 500kHz/External 300kHz to 2MHz Yes Internal/External isl85415.pdf
ISL85418 3 to 40 800mA Internal/External Internal 500kHz/External 300kHz to 2MHz Yes Internal/External isl85418.pdf
ISL85410 3 to 40 1A Internal/External Internal 500kHz/External 300kHz to 2MHz Yes Internal/External isl85410.pdf
ISL854102 3 to 40 1.2A Internal/External Internal 500kHz/External 300kHz to 2MHz Yes Internal/External isl854102.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

Design Resources

Related Videos

Play Video
2:43
See the outstanding load regulation performance of the ISL8541x family of pin-for-pin compatible synchronous buck regulators with a wide VIN range.
Play Video
2:48
See how easy it is to design with Intersil's new pin-for-pin compatible synchronous buck regulators with a wide input voltage range.
Play Video
2:43
See the outstanding load regulation performance of the ISL8541x family of pin-for-pin compatible synchronous buck regulators with a wide VIN range.
Play Video
2:48
See how easy it is to design with Intersil's new pin-for-pin compatible synchronous buck regulators with a wide input voltage range.
Play Video
2:43
See the outstanding load regulation performance of the ISL8541x family of pin-for-pin compatible synchronous buck regulators with a wide VIN range.
Play Video
2:48
See how easy it is to design with Intersil's new pin-for-pin compatible synchronous buck regulators with a wide input voltage range.

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