ISL6752_06 Datasheet, PDF (1/16 Pages) Intersil Corporation – ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous Rectifier Control

®
Data Sheet
April 4, 2006
ISL6752
FN9181.2
ZVS Full-Bridge Current-Mode PWM with
Adjustable Synchronous Rectifier Control
The ISL6752 is a high-performance, low-pin-count
alternative zero-voltage switching (ZVS) full-bridge PWM
controller. Like Intersil’s 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 light-
load performance with less complexity in a lower pin count
package.
The ISL6752 features complemented PWM outputs for
synchronous rectifier (SR) control. The complemented
outputs may be dynamically advanced or delayed relative to
the PWM outputs using an external control voltage.
This advanced BiCMOS design features precision deadtime
and resonant delay control, and an oscillator adjustable to
2MHz operating frequency. Additionally, Multi-Pulse
Suppression ensures alternating output pulses at low duty
cycles where pulse skipping may occur.
Ordering Information
PART
NUMBER
PART
MARKING
TEMP.
RANGE
(°C)
PKG.
PACKAGE DWG. #
ISL6752AAZA ISL6752AAZ -40 to 105 16 Ld QSOP M16.15A
(Note)
(Pb-free)
Add -T suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free plus anneal products employ special Pb-free
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
Pb-free products are MSL classified at Pb-free peak reflow
temperatures that meet or exceed the Pb-free requirements of
IPC/JEDEC J STD-020.
Features
• Adjustable Resonant Delay for ZVS Operation
• Synchronous Rectifier Control Outputs with Adjustable
Delay/Advance
• Current-Mode Control
• 3% Current Limit Threshold
• Adjustable Deadtime Control
• 175µA Startup Current
• Supply UVLO
• Adjustable Oscillator Frequency Up to 2MHz
• Internal Over Temperature Protection
• Buffered Oscillator Sawtooth Output
• Fast Current Sense to Output Delay
• Adjustable Cycle-by-Cycle Peak Current Limit
• 70ns Leading Edge Blanking
• Multi-Pulse Suppression
• Pb-Free Plus Anneal Available (RoHS Compliant)
• ELV, WEEE, and RoHS Compliant
Applications
• ZVS Full-Bridge Converters
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
Pinout
ISL6752 (QSOP)
TOP VIEW
VADJ 1
VREF 2
VERR 3
CTBUF 4
RTD 5
RESDEL 6
CT 7
CS 8
16 VDD
15 OUTLL
14 OUTLR
13 OUTUL
12 OUTUR
11 OUTLLN
10 OUTLRN
9 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005, 2006. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.