ISL6754_14 Datasheet, PDF (1/19 Pages) Intersil Corporation – ZVS Full-Bridge PWM Controller with Adjustable Synchronous Rectifier Control

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Data Sheet
September 29, 2008
ISL6754
FN6754.1
ZVS Full-Bridge PWM Controller with
Adjustable Synchronous Rectifier Control
The ISL6754 is a high-performance extension of the Intersil
family of zero-voltage switching (ZVS) full-bridge PWM
controllers. Like the ISL6752, 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 ISL6752’s feature set are average current
monitoring and soft-start. The average current signal may be
used for average current limiting, current sharing circuits and
average current mode control. Additionally, the ISL6754
supports both voltage- and current-mode control.
The ISL6754 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
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6754AAZA* 6754 AAZ -40 to +105 20 Ld QSOP M20.15
*Add -T suffix to part number for tape and reel packaging.
NOTE: These Intersil Pb-free plastic packaged products employ
special Pb-free material sets, molding compounds/die attach
materials, and 100% matte tin plate plus anneal (e3 termination
finish, which is 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
• Voltage- or Current-Mode Control
• 3% Current Limit Threshold
• Adjustable Average Current Limit
• Adjustable Deadtime Control
• 175µA Start-up 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 (RoHS Compliant)
Applications
• ZVS Full-Bridge Converters
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
Pinout
ISL6754
(20 LD QSOP)
TOP VIEW
VREF 1
VERR ²
CTBUF 3
RTD 4
RESDEL 5
CT 6
FB 7
RAMP 8
CS 9
IOUT 10
20 SS
19 VADJ
18 VDD
17 OUTLL
16 OUTLR
15 OUTUL
14 OUTUR
13 OUTLLN
12 OUTLRN
11 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2008. All Rights Reserved
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