IN

EN

NC

OUT

1

5

4

3

10µF

0.1µF

10µF

MBR0520L

MBR0520L

1:2.2

10µF

3

1

D2

SN6501

D1

Vcc

5

2

GND

GND

4

TPS76350

2

GND

SN6501

www.ti.com

SLLSEA0C – FEBRUARY 2012 – REVISED MARCH 2012

Transformer Driver for Isolated Power Supplies

Check for Samples: SN6501

1

FEATURES

APPLICATIONS

•

Push-Pull Driver for Small Transformers

•

Isolated Interface Power Supply for CAN, RS-

485, RS-422, RS-232, SPI, I2C, Low-Power LAN

•

Single 3.3 V or 5 V Supply

•

Industrial Automation

•

High Primary-side Current Drive:

•

Process Control

–

5 V Supply: 350 mA (max)

•

Medical Equipment

–

3.3 V Supply: 150 mA (max)

•

Low Ripple on Rectified Output Permits Small

Output Capacitors

•

Small 5-pin SOT23 Package

DESCRIPTION

The SN6501 is a monolithic oscillator/power-driver, specifically designed for small form factor, isolated power

supplies in isolated interface applications. It drives a low-profile, center-tapped transformer primary from a 3.3 V

or 5 V DC power supply. The secondary can be wound to provide any isolated voltage based on transformer

turns ratio.

The SN6501 consists of an oscillator followed by a gate drive circuit that provides the complementary output

signals to drive the ground referenced N-channel power switches. The internal logic ensures break-before-make

action between the two switches.

The SN6501 is available in a small SOT23-5 package, and is specified for operation at temperatures from –40°C

to 125°C.

Figure 1. Typical Operating Circuit

1

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of

Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.

PRODUCTION DATA information is current as of publication date.

Copyright © 2012, Texas Instruments Incorporated

Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.