1 Features

1• Isolated Fly-Buck™ Topology

• Primary Side Feedback

• 100 kHz to 2000 kHz Switching Frequency

• Synchronizes to External Clock

• Adjustable Slow Start

• Adjustable Input Voltage UVLO

• Open Drain Fault Output

• Cycle-by-Cycle Current Limit

• Thermal Shutdown Protection

• 3 mm x 3 mm 16 Pin QFN Package

2 Applications

• Noise Immunity in PLCs, Data Acquisition and

Measurement Equipment

• Isolated RS-232 and RS-485 Communication

Channels

• Powers Line Drivers, ISO Amplifiers, Sensors,

CAN Transceivers

• Floating Supplies for IGBT Gate Drivers

• Promotes Safety in Medical Equipment

3 Description

The TPS55010 is a transformer driver designed to

provide isolated power for isolated interfaces, such as

RS-485 and RS-232, from 3.3 V or 5 V input supply.

The device uses fixed frequency current mode control

and half bridge power stage with primary side

feedback to regulate the output voltage for power

levels up to 2W. The switching frequency is

adjustable from 100 kHz to 2000 kHz so solution size,

efficiency and noise can be optimized. The switching

frequency is set with a resistor or is synchronized to

external clock using the RT/CLK pin. To minimize

inrush currents, a small capacitor can be connected

to the SS pin. The EN pin can be used as an enable

pin or to increase the default input UVLO voltage

from 2.6V.

With the same transformer the TPS55010 can

provide a solution for different input and output

voltage combinations by adjusting the primary side

voltage. Off the shelf transformers are available to

provide single positive, or dual positive and negative

output voltages.

The TPS55010 is available in a 3mm x 3mm 16 pin

QFN package with thermal pad.