ISL6755 Datasheet, PDF (1/17 Pages) Intersil Corporation – ZVS Full-Bridge PWM Controller with Average Current Limit

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Data Sheet
September 29, 2008
ISL6755
FN6442.1
ZVS Full-Bridge PWM Controller with
Average Current Limit
The ISL6755 is a high-performance extension of the Intersil
family of full-bridge ZVS controllers. Like the ISL6753, 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 ISL6753’s feature set is average current
monitoring. The signal may be used for average current
limiting, current sharing circuits and average current mode
control.
This advanced BiCMOS design features low operating
current, adjustable oscillator frequency up to 2MHz,
adjustable soft-start, 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.
Ordering Information
PART
NUMBER
(Note)
PART
MARKING
TEMP.
RANGE
(°C)
PACKAGE PKG.
(Pb-free) DWG. #
ISL6755AAZA* 6755 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.
Pinout
ISL6755
(20 LD QSOP)
TOP VIEW
VERR 1
CTBUF 2
RTD 3
RESDEL 4
CT 5
FB2 6
FB1 7
RAMP 8
CS 9
IOUT 10
20 VREF
19 SS
18 VDD
17 OUTLL
16 OUTLR
15 OUTUL
14 OUTUR
13 N/C
12 GND
11 GND
Features
• Adjustable Resonant Delay for ZVS Operation
• Voltage- or Current-Mode Operation
• 3% Current Limit Threshold
• Adjustable Average Current Limit
• 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 (RoHS Compliant)
Applications
• ZVS Full-Bridge Converters
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
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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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