1

®

FN6703.1

CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.

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ISL6745A

Improved Bridge Controller with Precision

Dead Time Control

The ISL6745A is a low-cost double-ended voltage-mode

PWM controller designed for half-bridge and full-bridge

power supplies and line-regulated bus converters. It

provides precise control of switching frequency, adjustable

soft-start, and overcurrent shutdown. In addition, the

ISL6745A allows for accurate adjustment of MOSFET

non-overlap time (“deadtime”) with deadtimes as low as

35ns, allowing power engineers to optimize the efficiency of

open-loop bus converters. The ISL6745A also includes a

control voltage input for closed-loop PWM and line voltage

feed-forward functions. The ISL6745A is identical to the

ISL6745, 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 also features adjustable switching

frequency up to 1MHz, 1A FET drivers, and very low

propagation delays for a fast response to overcurrent faults.

The ISL6745A is available in a space-saving MSOP-10

package and is guaranteed to meet rated specifications over

a wide -40°C to +105°C temperature range.

Features

• Precision Duty Cycle and Deadtime Control

• 100µA Start-up Current

• Adjustable Delayed Overcurrent Shutdown and Re-Start

• 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

• Half-bridge Converters

• Full-bridge Converters

• Line-regulated Bus Converters

• AC/DC Power Supplies

• Telecom, Datacom, and File Server Power

Ordering Information

PART

NUMBER

(Note)

PART

MARKING

TEMP.

RANGE

(°C)

PACKAGE

(Pb-Free)

PKG.

DWG. #

ISL6745AAUZ* 6745A

-40 to +105 10 Ld MSOP M10.118

*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.

Pinout

ISL6745A

(10 LD MSOP)

TOP VIEW

SS 1

RTD

VERR

CS

CT

GND

OUTA

OUTB

VDDP

VDD

2

3

4

5

6

7

8

9

10

Data Sheet

September 11, 2008