ISL6742_14 Datasheet, PDF (1/18 Pages) Intersil Corporation – Advanced Double-Ended PWM Controller

®
Data Sheet
October 31, 2008
ISL6742
FN9183.2
Advanced Double-Ended PWM Controller
The ISL6742 is a high-performance double-ended PWM
controller with advanced synchronous rectifier control and
current limit features. It is suitable for both current- and
voltage-mode control methods.
The ISL6742 includes complemented PWM outputs for
synchronous rectifier (SR) control. The complemented
outputs may be dynamically advanced or delayed relative to
the main outputs using an external control voltage.
Its advanced current sensing circuitry employs sample and
hold methods to provide a precise average current signal.
Suitable for average current limiting, a technique which
virtually eliminates the current tail-out common to peak
current limiting methods, it is also applicable to current
sharing circuits and average current mode control.
This advanced BiCMOS design features an adjustable
oscillator frequency up to 2MHz, internal over-temperature
protection, precision deadtime 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 PART TEMP. RANGE PACKAGE PKG.
(Note)
MARKING
(°C)
(Pb-free) DWG. #
ISL6742AAZA* ISL 6742AAZ -40 to +105 16 Ld QSOP M16.15A
*Add “-T” suffix for tape and reel. Please refer to TB347 for details on
reel specifications.
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
• Synchronous Rectifier Control Outputs with Adjustable
Delay/Advance
• Adjustable Average Current Signal
• 3% Tolerance Cycle-by-Cycle Peak Current Limit
• Fast Current Sense to Output Delay
• Adjustable Oscillator Frequency Up to 2MHz
• Adjustable Deadtime Control
• Voltage- or Current-Mode Operation
• Separate RAMP and CS Inputs for Voltage Feed-Forward
or Current-Mode Applications
• Tight Tolerance Error Amplifier Reference Over Line,
Load, and Temperature
• 175µA Start-up Current
• Supply UVLO
• Adjustable Soft-Start
• 70ns Leading Edge Blanking
• Multi-Pulse Suppression
• Internal Over-Temperature Protection
• Pb-Free (RoHS Compliant)
Applications
• Half-Bridge, Full-Bridge, Interleaved Forward, and Push-Pull
Converters
• Telecom and Datacom Power
• Wireless Base Station Power
• File Server Power
• Industrial Power Systems
Pinout
ISL6742
(16 LD QSOP)
TOP VIEW
VREF 1
VERR 2
RTD 3
CT 4
FB 5
RAMP 6
CS 7
IOUT 8
16 SS
15 VADJ
14 VDD
13 OUTA
12 OUTB
11 OUTAN
10 OUTBN
9 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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