ISL6744A Datasheet, PDF (1/18 Pages) Intersil Corporation – Intermediate Bus PWM Controller

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Data Sheet
October 8, 2007
ISL6744A
FN6554.0
Intermediate Bus PWM Controller
The ISL6744A is a low cost, primary side, double-ended
controller intended for applications using full and half-bridge
topologies for unregulated DC/DC converters. It is a voltage-
mode PWM controller designed for half-bridge and full-
bridge power supplies. It provides precise control of
switching frequency, adjustable soft-start, precise deadtime
control with deadtimes as low as 35ns, and overcurrent
shutdown. The ISL6744A is identical to the ISL6744, but is
optimized for higher noise environments.
Low start-up and operating currents allow for easy biasing in
both AC/DC and DC/DC applications. This advanced
BiCMOS design features low start-up and operating
currents, adjustable switching frequency up to 1MHz, 1A
FET drivers, and very low propagation delays for a fast
response to overcurrent faults.
Ordering Information
PART
NUMBER
PART
TEMP.
PKG.
MARKING RANGE (°C) PACKAGE DWG. #
ISL6744AAUZ 6744A
(Note)
-40 to +105 8 Ld MSOP M8.118
(Pb-free)
ISL6744AABZ 6744AABZ
(Note)
-40 to +105 8 Ld SOIC M8.15
(Pb-free)
*Add “-T” or “-TK” 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
• Precision Duty Cycle and Deadtime Control
• 100µA Start-up Current
• Adjustable Delayed Overcurrent Shutdown and Restart
• Adjustable Oscillator Frequency Up to 2MHz
• 1A MOSFET Gate Drivers
• Adjustable Soft-Start
• Internal Over Temperature Protection
• 35ns Control to Output Propagation Delay
• Small Size and Minimal External Component Count
• Input Undervoltage Protection
• Pb-Free (RoHS Compliant)
Applications
• Telecom and Datacom Isolated Power
• DC Transformers
• Bus Converters
Pinout
ISL6744A
(SOIC, MSOP)
TOP VIEW
SS 1
RTD 2
CS 3
CT 4
8 VDD
7 OUTB
6 OUTA
5 GND
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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