The ISL6753 is a high-performance, low-pin-count
alternative, zero-voltage switching (ZVS) full-bridge PWM
controller. Like the ISL6551, 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. Compared to the more
familiar phase-shifted control method, this algorithm offers
equivalent efficiency and improved overcurrent and lightload performance with less complexity in a lower pin count package.
This advanced BiCMOS design features low operating
current, adjustable oscillator frequency up to 2MHz,
adjustable soft-start, internal over temperature protection,
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.

Features
• Adjustable Resonant Delay for ZVS Operation
• Voltage- or Current-Mode Operation
• 3% Current Limit Threshold
• 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 Plus Anneal Available and ELV, WEEE, RoHS Compliant

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