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Current Sense Transformer - 1:500

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Triad Magnetics CST25 Current Sense Transformers are ideal for monitoring currents in high-frequency applications such as switch-mode power supplies, LED lighting, etc. The CST25 components are offered with a built-in sense winding, allowing for ease of use. These fully encapsulated current sense transformers allow for a high isolation voltage of 4000VAC between primary and secondary windings. There are five different popular turn ratios available.

  • Mounting Style: Through Hole
  • Inductance: 470 mH
  • Current Rating: 25A
  • Turns Ratio: 1:500
  • Secondary Resistance: 16 Ohms
  • Termination Style: Solder Pin
  • Frequency Range: 50 kHz to 500 kHz
  • Operating Temperature Range: +40C to +100C
  • Output Current: 50 mA

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  • Interesting item. If I understand current transformers correctly, a ‘load’ resistor is placed across the secondary, effectively converting the current to a voltage. If I’m using a 5V A-to-D converter to read the voltage, a 100 ohm load resistor will provide full scale measurements (25 amps in, 500 ma out) ? This assumes I’m sampling fast enough to find the peaks in the AC waveform. Am I missing something?

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