TLP3547 Simple Evaluation

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TLP3547 Simple Evaluation [Copy link]

  Test purpose: To perform performance test on photorelay TLP3547 Test tools: 1, adjustable DC power supply 2. Oscilloscope 3. Multimeter 15B Environment: 23℃ humidity 47% According to TLP3547F test conditions, If=5mA, VDD 20V, load 200Ω. There is a current limiting resistor If welded on the back of the evaluation table. After removal, short-circuit it. Connect a 660Ω current limiting resistor in series in the circuit you welded. VCC uses 5V, so If=（5-1.64）/660=5.1mA, and the typical value of Vf is 1.64V. The input terminal is connected to the drive signal generated by the waveform generator, square wave, amplitude 5V, and the test point TP3 is connected to the oscilloscope channel 1. The load end VDD is connected to 20VDC, the load is connected to a 200Ω resistor, and the TP4 test point is connected to the oscilloscope channel 2. When 1Hz driving signal is input and load voltage VDD 20V, the rise delay and fall delay graphs are obtained. It can be seen from the graph that the rise delay is 127us and the fall delay is 865us When 10Hz driving signal is input and load voltage VDD 20V, the rise delay and fall delay graphs are obtained. It can be seen from the graph that the rise delay is 136us and the fall delay is 1014us When 50Hz driving signal is input and load voltage VDD 20V, the rise delay and fall delay graphs are obtained. It can be seen from the graph that the rise delay is 153us and the fall delay is 1123us. When a 500Hz drive signal is input and the load voltage VDD is 20V, the rise delay and fall delay diagrams are obtained. It can be seen from the figure that the rise delay is 99us and the fall delay is 1210us. It can be seen from the figure that 500Hz is close to the critical frequency of shutdown. When the frequency is increased, some parts will be completely shut down. The data may have a slight error (The data may have a slight error), but it does not affect the overall trend. Conclusion: 1. In terms of rise delay, the TLP3547F time is about 25 times faster than the mechanical relay on average. 2. In terms of fall delay, the TLP3547F time is about 4 times faster than the mechanical relay on average. 3. In terms of switching frequency, the critical frequency of TPL3547F is around 500Hz. Due to limited time and personal ability, thank you!