Renesas offers a broad portfolio of single-ended and double-ended isolated PWM controllers, and zero-voltage switching (ZVS) full bridge controllers.

Use the following table to identify which 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 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

 High Performance Industry Standard Single-Ended PWM Controllers

ISL884X Family

Renesas' family of flexible single-ended current mode pulse width modulating (PWM) controllers is designed for a wide range of DC/DC conversion applications including boost, flyback, and isolated output configurations. With fast signal propagation and output switching characteristics, these products are ideal for existing and new designs.

Features include 30V operation, low operating current, 90µA startup current, adjustable operating frequency to 2MHz, and high peak current drive capability with 20ns rise and fall times.

Device Characteristic ISL8840A ISL8841A ISL8842A ISL8843A ISL8844A ISL8845A
UVLO 7.0V 7.0V 14.4V 8.4V 14.4V 8.4V
MAX Duty 96% 48% 96% 96% 48% 48%
Startup Current 90µA
VREF Accuracy +1% – 1.5%
Gate Drive 1A
Current Sense Prop Delay 35ns
Fsw Range Up to 2MHz
Error Amp BW 1.5MHz
Temp Range -40 °C – 105 °C
Minimum Duty 0%
Package SOIC8 or MSOP8

Family Values

  • -55°C - 125°C Military Temperature Grade Available
  • Small Package
  • Best Reference Accuracy
  • Least Current Sense Delay
  • Wide BW Error Amp

Applications

  • Telecom and Datacom Power
  • Wireless Base Station Power
  • File Server Power
  • Industrial Power Systems
  • PC Power Supplies
  • Isolated Buck and Flyback Regulators
  • Boost Regulators

Double-Ended PWM Controllers

ISL674X Family

Renesas' high performance double-ended pulse width modulating (PWM) controllers are suitable for both current- and voltage-mode control methods and designed for a wide range of power conversion applications using half-bridge, full bridge, and push-pull configurations.

Device Characteristic ISL6740 ISL6740A ISL6741 ISL6742 ISL6744A ISL6745A
Control Mode Voltage Voltage Peak current Voltage or peak current 50% free run Voltage
Voltage Feed Forward External Internal Not required Adjustable NA External
Package TSSOP16 TSSOP16 TSSOP16 QSOP16 MSOP8 MSOP10
FET Drive Voltage/Current 5V/0.5A 5V/0.5A 5V/0.5A VCC/10mA VCC/1A VCC/1A
SR Control No No No Yes No No
Output Current Sense No No No Yes No No
Current Limit Method Hiccup with adjustable shutdown delay Hiccup with adjustable shutdown delay Pulse by pulse with optional hiccup Pulse by pulse and/or average constant current limit Pulse by pulse with delayed hiccup Pulse by pulse with delayed hiccup
Internal Error Amplifier No No No Yes No No
UVLO 7.25V 7.25V 7.25V 8.75V 6.3V 6.3V
Frequency Sync Input Yes Yes Yes No No No
Fault Indicator Yes Yes Yes No No No

Family Values

  • Full Family to Support All Double-ended Topology
  • Flexible Control Modes
  • Reliable Protection Features
  • Unique Output Current Sense Feature
  • Optimized/Adjustable Dead Time Control

Applications

  • AC/DC Power Supplies
  • Bus Converters
  • DC Transformers
  • File Server Power
  • Half-Bridge and Full-Bridge Converters
  • Industrial Power Systems
  • Line-regulated Bus Converters
  • Telecom and Datacom Power
  • Wireless Base Station Power

ZVS Full Bridge Controllers

ISL675X Family

The ISL675X family of controllers consists of high-performance, low-pin-count alternative zero-voltage switching (ZVS) full bridge pulse width modulating (PWM) controllers. These parts achieve ZVS operation by driving the upper bridge FETs at a fixed 50% duty cycle while the lower bridge FETS are trailing-edge modulated with adjustable resonant switching delays.

Device Characteristic ISL6752 ISL6753 ISL6754 ISL6755
SR Control Yes No Yes No
Output Current Sense No No Yes Yes
Soft Start No Yes Yes Yes
Package QSOP16 QSOP16 QSOP20 QSOP20
Control Mode Peak current Peak current or voltage mode with FF Peak current or voltage mode with FF Peak current or voltage mode with FF
Internal Error Amp No Yes Yes Yes (2x)
Current Limit Pulse by pulse Pulse by pulse Pulse by pulse and average current limit Pulse by pulse and average current limit
Buffered OSC Output Yes Yes Yes Yes
Driver Voltage/Current VCC/10mA VCC/10mA VCC/10mA VCC/10mA
UVLO 8.75V 8.75V 8.75V 8.75V

Family Values

  • Unique PWM ZVS Control Algorithm
  • Easy for True Peak Mode Control
  • Easy for Diode Emulation and Light Load Burst Mode Operation
  • Easy For SR Control
  • Unique Output Current Sense Feature
  • Simple Implementation for Brick Wall Constant Current Limit
  • Simple Implementation for Current Sharing Control

Applications

  • ZVS Full Bridge Converters
  • Telecom and Datacom Power
  • Wireless Base Station Power
  • File Server Power
  • Industrial Power Systems