Isolated Power Quick Guide

Isolated Topologies & Intersil Solutions
Browse Products

Use the following table to identify which Intersil products will best meet the needs of your next isolated power project:

Topology Characteristic Flyback Forward (Two Switch) Active Clamp Forward Push-Pull Half-Bridge Full-Bridge ZVS Full Bridge (Telecom) Hard SW
Recommended Power Level <150W 120W~200W 120- 400W 100W~500W 150W~500W >400W >400W
Efficiency Least
~70-80%
Moderate
~ 80-90%
High
85~92%
Moderate
~ 85-93%
High
~ 95%+
High
~ 95%+
High
~ 95%+
Recommended Intersil Devices

ISL884X

ISL672X

ISL672X ISL6726 ISL6741 ISL674X ISL675X ISL674X
PFC Stage ISL673X
Cost Least Low Low Low Medium High High
Transfer Function = Vout/Vin (Ns/Np)*D/(1-D) (Ns/Np)*D (Ns/Np)*D 2*(Ns/Np)*D (Ns/Np)*D 2*(Ns/Np)*D 2*(Ns/Np)*D
High Input Voltage Good for bias supply Good for 2-switch forward Good Not recommended Good Good Good
Max. Duty Cycle < 100% < 50% (70% with active clamp) 70% < 50% each < 50% each < 50% each < 50% each

Family Values

  • Full Family Features AC/DC Solution with Smallest Package
  • Unique Output Current Sensing Scheme
  • Unique Brick Wall OCP Protection Feature
  • Unique Full Bridge ZVS Control Scheme
  • Optimized/Adjustable Dead Time Control

Applications

  • AC/DC Power Supply
  • Brick Convertor
  • Power Factor Correction (PFC) Board
  • AC/DC Adapter

Isolated Power Reference Designs and Evaluation Platforms

ISL6740EVAL3Z
  REFERENCE DESIGN
The ISL6740EVAL3Z serves as a reference design for a 48V to ±12V, 3.3V and 1.5V isolated power supply.
ISL6726EVAL1Z
  EVAL BOARD
The ISL6726EVAL1Z board uses the ISL6726, an advanced current mode PWM controller, to implement control of an active clamp forward.
ISL6745EVAL1Z
  EVAL BOARD
The ISL6745EVAL1Z evaluates the performance of the ISL6745 PWM controller for telecom applications.
ISL6841EVAL3Z
  EVAL BOARD
The ISL6841EVAL3Z evaluates the performance of the ISL6841 PWM controller for general purpose industrial applications.
ISL6721EVAL3Z
  EVAL BOARD
The ISL6721EVAL3Z eval board serves as a reference design for single switch resonant reset forward converter with multiple outputs for industrial...
ISL6730xEVAL1Z
  EVAL BOARD
The ISL6730x are voltage mode PFC controllers designed to drive cost-effective converters to meet input line harmonic regulations.
ISL6745ALEVAL3Z
  EVAL BOARD
The ISL6745ALEVAL3Z is a low cost, high performance LED driver with pfc function, and is compatible with the widely used wall dimmers.
The ISL6745LEVAL2Z, ISL6745UEVAL2Z evaluation boards are reference designs for powering high brightness white LEDs.
ISL6844EVAL1Z
  EVAL BOARD
Powered device portion of the Power over Ethernet (PoE) circuit for IP phones, WLAN access points, security cameras and RFID tag reader applications.
ISL6740EVAL3Z
  REFERENCE DESIGN
The ISL6740EVAL3Z serves as a reference design for a 48V to ±12V, 3.3V and 1.5V isolated power supply.
ISL6726EVAL1Z
  EVAL BOARD
The ISL6726EVAL1Z board uses the ISL6726, an advanced current mode PWM controller, to implement control of an active clamp forward.
ISL6745EVAL1Z
  EVAL BOARD
The ISL6745EVAL1Z evaluates the performance of the ISL6745 PWM controller for telecom applications.
ISL6841EVAL3Z
  EVAL BOARD
The ISL6841EVAL3Z evaluates the performance of the ISL6841 PWM controller for general purpose industrial applications.
ISL6721EVAL3Z
  EVAL BOARD
The ISL6721EVAL3Z eval board serves as a reference design for single switch resonant reset forward converter with multiple outputs for industrial...
ISL6730xEVAL1Z
  EVAL BOARD
The ISL6730x are voltage mode PFC controllers designed to drive cost-effective converters to meet input line harmonic regulations.
ISL6745ALEVAL3Z
  EVAL BOARD
The ISL6745ALEVAL3Z is a low cost, high performance LED driver with pfc function, and is compatible with the widely used wall dimmers.
The ISL6745LEVAL2Z, ISL6745UEVAL2Z evaluation boards are reference designs for powering high brightness white LEDs.
ISL6844EVAL1Z
  EVAL BOARD
Powered device portion of the Power over Ethernet (PoE) circuit for IP phones, WLAN access points, security cameras and RFID tag reader applications.
ISL6740EVAL3Z
  REFERENCE DESIGN
The ISL6740EVAL3Z serves as a reference design for a 48V to ±12V, 3.3V and 1.5V isolated power supply.
ISL6726EVAL1Z
  EVAL BOARD
The ISL6726EVAL1Z board uses the ISL6726, an advanced current mode PWM controller, to implement control of an active clamp forward.
ISL6745EVAL1Z
  EVAL BOARD
The ISL6745EVAL1Z evaluates the performance of the ISL6745 PWM controller for telecom applications.
ISL6841EVAL3Z
  EVAL BOARD
The ISL6841EVAL3Z evaluates the performance of the ISL6841 PWM controller for general purpose industrial applications.
ISL6721EVAL3Z
  EVAL BOARD
The ISL6721EVAL3Z eval board serves as a reference design for single switch resonant reset forward converter with multiple outputs for industrial...
ISL6730xEVAL1Z
  EVAL BOARD
The ISL6730x are voltage mode PFC controllers designed to drive cost-effective converters to meet input line harmonic regulations.
ISL6745ALEVAL3Z
  EVAL BOARD
The ISL6745ALEVAL3Z is a low cost, high performance LED driver with pfc function, and is compatible with the widely used wall dimmers.
The ISL6745LEVAL2Z, ISL6745UEVAL2Z evaluation boards are reference designs for powering high brightness white LEDs.
ISL6844EVAL1Z
  EVAL BOARD
Powered device portion of the Power over Ethernet (PoE) circuit for IP phones, WLAN access points, security cameras and RFID tag reader applications.