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ISL6752 Datasheet

  • ISL6752

  • ZVS Full-Bridge Current-Mode PWM with Adjustable Synchronous...

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ISL6752
Data Sheet
March 10, 2005
FN9181.1
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鈥檚 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.
Features
鈥?Adjustable Resonant Delay for ZVS Operation
鈥?Synchronous Rectifier Control Outputs with Adjustable
Delay/Advance
鈥?Current-Mode Control
鈥?3% Current Limit Threshold
鈥?Adjustable Deadtime Control
鈥?175碌A(chǔ) Startup Current
鈥?Supply UVLO
鈥?Adjustable Oscillator Frequency Up to 2MHz
鈥?Internal Over Temperature Protection
鈥?Buffered Oscillator Sawtooth Output
鈥?Fast Current Sense to Output Delay
鈥?Adjustable Cycle-by-Cycle Peak Current Limit
鈥?70ns Leading Edge Blanking
鈥?Multi-Pulse Suppression
鈥?Pb-Free (RoHS Compliant)
鈥?ELV, WEEE, and RoHS Compliant
Ordering Information
PART NUMBER
ISL6752AAZA
(Note)
TEMP. RANGE
(擄C)
-40 to 105
PACKAGE
16 Ld QSOP
(Pb-free)
PKG.
DWG. #
M16.15A
Applications
鈥?ZVS Full-Bridge Converters
鈥?Telecom and Datacom Power
鈥?Wireless Base Station Power
鈥?File Server Power
鈥?Industrial Power Systems
Add -T suffix to part number for tape and reel packaging.
NOTE: Intersil Pb-free 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.
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 1-888-352-6832
|
Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2005. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.

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