TPS55010: Isolated DC/DC Converter

Photocoupler

Summary:

The TPS55010 is a transformer driver designed to provide isolated power to isolated interfaces such as RS-485 and RS-232 with a 3.3V or 5V input supply.

The device uses fixed frequency current mode control and a half-bridge power stage with primary side feedback to regulate the output voltage for the 2W power level. The switching frequency can be adjusted from 100 kHz to 2000 kHz, thus finding the best balance between size, efficiency and noise specifications. The switching frequency is set with a resistor or synchronized to an external clock using the RT/CLK pin. To minimize inrush current, connect a small capacitor to the SS pin. The EN pin is used as an enable pin or to increase the default input UVLO voltage (starting at 2.6V).

Device characteristics

Isolated Fly-Buck? topology

Primary side feedback

100 kHz to 2000 kHz switching frequency

Sync to external clock

Adjustable slow start

Adjustable input voltage UVLO

Open drain fault output

Cycle-by-cycle current limit

With thermal shutdown protection

3mm x 3mm 16-pin QFN package

Device application

Provides noise immunity in PLC, data acquisition and measurement equipment

Isolated RS-232 and RS-485 communication channels

Power line driver, ISO amplifier, sensor, CAN transceiver

Floating power supply for IGBT gate drivers

Improve the safety of medical equipment

TPS55010 pin structure

TPS55010 internal structure block diagram

TPS55010 typical application circuit

Reference materials:

1.TPS55010 data sheet can be found in the PDF document (click on the PDF file to download)

2. Learn electronic components from scratch: http://

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