DATASHEET ISL6753 FN9182 Rev 2.00 ZVS Full-Bridge PWM Controller April 4, 2006 The ISL6753 is a high-performance, low-pin-count Features alternative, zero-voltage switching (ZVS) full-bridge PWM Adjustable Resonant Delay for ZVS Operation controller. Like the ISL6551, it achieves ZVS operation by driving the upper bridge FETs at a fixed 50% duty cycle while Voltage- or Current-Mode Operation the lower bridge FETS are trailing-edge modulated with 3% Current Limit Threshold adjustable resonant switching delays. Compared to the more 175A Startup Current familiar phase-shifted control method, this algorithm offers equivalent efficiency and improved overcurrent and light- Supply UVLO load performance with less complexity in a lower pin count Adjustable Deadtime Control package. Adjustable Soft-Start This advanced BiCMOS design features low operating current, adjustable oscillator frequency up to 2MHz, Adjustable Oscillator Frequency Up to 2MHz adjustable soft-start, internal over temperature protection, Tight Tolerance Error Amplifier Reference Over Line, precision deadtime and resonant delay control, and short Load, and Temperature propagation delays. Additionally, Multi-Pulse Suppression 5MHz GBWP Error Amplifier ensures alternating output pulses at low duty cycles where pulse skipping may occur. Adjustable Cycle-by-Cycle Peak Current Limit Fast Current Sense to Output Delay Ordering Information 70ns Leading Edge Blanking PART PART TEMP. PKG. NUMBER MARKING RANGE (C) PACKAGE DWG. Multi-Pulse Suppression ISL6753AAZA ISL6753AAZ -40 to 105 16 Ld QSOP M16.15A Buffered Oscillator Sawtooth Output (See Note) (Pb-free) Add -T suffix to part number for tape and reel packaging Internal Over Temperature Protection Pb-Free Plus Anneal Available and ELV, WEEE, NOTE: Intersil Pb-free plus anneal products employ special Pb-free RoHS Compliant material sets molding compounds/die attach materials and 100% matte tin plate termination finish, which are RoHS compliant and compatible with both SnPb and Pb-free soldering operations. Intersil Applications Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of ZVS Full-Bridge Converters IPC/JEDEC J STD-020. Telecom and Datacom Power Wireless Base Station Power Pinout File Server Power ISL6753 (QSOP) TOP VIEW Industrial Power Systems VERR 1 16 VREF 2 15 CTBUF SS 3 14 RTD VDD 4 13 RESDEL OUTLL CT 5 12 OUTLR FB 6 11 OUTUL 7 10 RAMP OUTUR 89 CS GND FN9182 Rev 2.00 Page 1 of 15 April 4, 2006ISL6753 FN9182 Rev 2.00 Page 2 of 15 April 4, 2006 Functional Block Diagram VDD VDD OUTUL 50% VREF OUTUR UVLO PWM STEERING LOGIC OVER- OUTLL TEMPERATURE PWM PROTECTION OUTLR GND + CS VREF - 1.00V 70 nS LEADING OVER CURRENT EDGE RESDEL COMPARATOR BLANKING 80mV + RAMP - 0.33 PWM OSCILLATOR COMPARATOR CT VREF 1 mA VREF RTD VERR CTBUF + 0.6V SOFTSTART SS CONTROL - FB