ISL6753 Datasheet, PDF (1/15 Pages) Intersil Corporation – ZVS Full-Bridge PWM Controller

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Data Sheet
March 10, 2005
ISL6753
FN9182.1
ZVS Full-Bridge PWM Controller
The ISL6753 is a high-performance, low-pin-count
alternative zero-voltage switching (ZVS) full-bridge PWM
controller. Like the 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.
This advanced BiCMOS design features low operating
current, adjustable oscillator frequency up to 2MHz,
adjustable soft-start, internal over temperature protection,
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
TEMP. RANGE
PART NUMBER
(°C)
PACKAGE
PKG.
DWG. #
ISL6753AAZA
(See Note)
-40 to 105 16 Ld QSOP M16.15A
(Pb-free)
Add -T suffix to part number for tape and reel packaging
Features
• Adjustable Resonant Delay for ZVS Operation
• Voltage- or Current-Mode Operation
• 3% Current Limit Threshold
• 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 and ELV, WEEE, RoHS Compliant
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.
Applications
• ZVS Full-Bridge Converters
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
Pinout
ISL6753 (QSOP)
TOP VIEW
VERR 1
CTBUF 2
RTD 3
RESDEL ⁴
CT 5
FB 6
RAMP 7
CS 8
16 VREF
15 SS
14 VDD
13 OUTLL
12 OUTLR
11 OUTUL
10 OUTUR
9 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Copyright Intersil Americas Inc. 2005. All Rights Reserved
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