For Avionic Applications: Reliable Phase-Shift Driver PCB based on TLC6A598

Arshmah Shahkar

The Texas Instruments TLC6A598 evaluation board helps designers to evaluate the operation and performance of the TLC6A598 8-Bit Shift Register designed for the high current multi-load application. It is a monolithic, high-voltage, high-current power 8-bit shift register designed for use in systems that require relatively high load power such as LEDs. The Texas Instruments TLC6A598 characterization is for operation over the operating ambient temperature range of −55°C to 125°C.

Hardware Components

1.Test pointsx5
2.Yellow Connector jack x1
3.Header 5×2 x1
4.Res 2.4k x8
6.Res 0ohm x8
7.Head screwx4
8.Header 8×1 x2
9.TLC6A598MDWR x1
10.Res 10k x17
11.Red Connector Jack x1
12.Cap 220uF x1
13.Green LED x8
14.Black Connector jack x1
15.Cap 0.1uF x10

Software Tools:

  • Inventhub
  • Altium Designer

Phase Shift:

Avionics refers to the electronic systems designed for use in aviation. It is a combination of both aircraft and electronic systems. It includes navigation, flight control, engine control system, fault or damage detection, and communication. Applications of avionics are in Commercial airliners, helicopters, military fighter jets, and spacecraft. They use avionics to provide services, track and identify performance measures, and operate within established safety parameters.

In avionics, communication through RADAR is very crucial. The TLC6A598 is responsible for communication and safety in avionics. They control the phase of elements in a phased array antenna in communication, especially in RADAR. This is how communication is possible in avionics.


It contains an 8-bit serial-in, parallel-out shift register that is used to provide an 8-bit D-type storage register. This device has built-in voltage clamps on the output side for inductive transient protection, so it can also drive relays, solenoids, and other low-current or high-voltage loads. They can limit the current level to avoid any short circuits in the device. This device is highly reliable and robust for avionic applications.

Outputs are low-side, open-drain DMOS transistors with output ratings of 50 V and 350-mA continuous sink-current capabilities. The current limit decreases as the junction temperature increases for additional device protection. A built-in load open or load short diagnostic mechanism provides enhanced safety protection. The device provides a cycle redundancy check to verify register values in the shift registers.

Board Design:

I have designed a board using a TLC6A598. The purpose of designing this board is to provide an example of the solution of controlling 8 channel relays. This board helps users evaluate the operation and performance of the TLC6A598. It operates with two power supplies i.e. 5V DC and 24V DC. One of them is used to control TLC6A598 and the other one is used to provide power to relays.

Design files:

I have uploaded the schematic file of this board online on Inventhub. The viewers can visually view and download it to implement my design.

For a better view of my PCB design board in different layers, I have uploaded the PCB file of my deign on Inventhub. The manufacturer can easily download this file and implement my design on a board without any error.

For fabrication of this board, I have created a release file of the project which is a ZIP file containing all schematic, PCB, routing layers, and 3D model of the chip. To fabricate my PCB, I will send this release file to my manufacturer instead of visiting him, he can download the file and fabricate my board.

Bill of Materials:

I also have created an online Bill of Material on Inventhub. Sometimes, it becomes difficult to order the component with the same footprint and dimensions as per design requirements. This BOM file contains the details of the dimensions of each component. The component provider can export the file in CSV format and can deliver my components easily. I can calculate the total cost of my project according to the components and manufacturer I have chosen for my design. By clicking on ‘Edit BOM’ I can select the ‘supply chain’ button to calculate the cost of my product.

Why TLC6A598?

As compared to NPIC6C596 and STPIC6D595 devices, TLC6A598 is more efficient and reliable. It protects the loads from any damage. They can work on high power and can limit the current. Following are the major reasons why TLC6A598 is better and preferable to other devices.

  • Overcurrent Protection
  • Low Power consumption
  • Output Detection
  • Serial Communication Error detection
  • Thermal Shutdown
  • Enhanced cascading for multiple stages
  • Open and short load detection

Circuit Design and Testing:

The TLC6A598 device is designed to operate with an input voltage supply range from 3 V to 5.5 V. It operates with two supply power rails, one power rail for the TLC6A598 and another power rail for the relays. This board is designed to work with the USB2ANY board and USB2ANY Explore Software.

The USB2ANY board is available here.

The test setup of this board can be arranged as:

TLC6A598EVM Test Bench Setup by Texas Instruments


To get complete how-to and detailed information on the project design and implementation visit this link:

Complete Project link

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