ISL6755
ZVS Full-Bridge PWM Controller with Average Current Limit

Key Features

• Adjustable Resonant Delay for ZVS Operation
• Voltage- or Current-Mode Operation
• 3% Current Limit Threshold
• Adjustable Average Current Limit
• 175µA Startup Current
• Supply UVLO
• Adjustable Deadtime Control
• Adjustable Soft-Start
• Adjustable Oscillator Frequency Up to 2MHz
• Tight Tolerance Error Amplifier Reference Over Line, Load, and Temperature
• 5MHz GBWP Error Amplifier
• Adjustable Cycle-by-Cycle Peak Current Limit
• Fast Current Sense to Output Delay
• 70ns Leading Edge Blanking
• Multi-Pulse Suppression
• Buffered Oscillator Sawtooth Output
• Internal Over-Temperature Protection
• Pb-Free (RoHS Compliant)

Description

The ISL6755 is a high-performance extension of the Intersil family of full-bridge ZVS controllers. Like the ISL6753, it achieves 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.

Adding to the ISL6753's feature set is average current monitoring. The signal may be used for average current limiting, current sharing circuits and average current mode control.

This advanced BiCMOS design features low operating current, adjustable oscillator frequency up to 2MHz, adjustable soft-start, precision deadtime and resonant delay control, and short propagation delays. Additionally, Multi-Pulse Suppression ensures alternating output pulses at low duty cycles where pulse skipping may occur.

Applications

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