SLOU565 August   2024

 

  1.   1
  2.   Description
  3.   Features
  4.   Applications
  5.   5
  6. 1Evaluation Module Overview
    1. 1.1 Introduction
    2. 1.2 Kit Contents
    3. 1.3 Specification
    4. 1.4 Device Information
  7. 2Hardware
    1. 2.1 Getting Started
      1. 2.1.1 Power Supplies
      2. 2.1.2 Input
      3. 2.1.3 Output
    2. 2.2 Application Circuit
      1. 2.2.1 Astable Mode
    3. 2.3 Evaluation Module Limitations
    4. 2.4 Electrostatic Discharge Caution
  8. 3Hardware Design Files
    1. 3.1 Schematic
    2. 3.2 PCB Layout
    3. 3.3 Bill of Materials
  9. 4Additional Information
    1. 4.1 Trademarks
  10. 5Related Documentation

2.2.1 Astable Mode

Figure 2-1 shows a simplified schematic of the EVM for the purpose of this application circuit. Figure 2-1 shows the full default configuration of the TLC3555EVM. The EVM operates on a single supply of VDD =  1.5 V to VDD =  18V.

TLC3555EVM TLC3555 Astable Circuit Configuration Figure 2-1 TLC3555 Astable Circuit Configuration

The default EVM configuration is the Astable mode of operation. Figure 2-2 shows a Tina TI simulation of the Astable configuration shown in Figure 2-1. The power supply is VDD = 15V. The frequency of operation can be calculated using Equation 1.

Equation 1. f ≈ 1.44 ( R 2   + 2 R 7 ) C 4   H z
Equation 2. f≈1.44(1.3 kΩ +2×2.40 kΩ)6.8 nF ≈ 34.7 kHz
TLC3555EVM TLC3555 Astable Simulation with VDD = 15V Figure 2-2 TLC3555 Astable Simulation with VDD = 15V