• 1.

    Operating Temp. Range: The combination of ambient temperature and temperature rise.

  • 2.

    Secondary Inductance: Tested at 10kHz, 0.1 VRMS.

  • 3.

    Primary DCR (8-7): 4.7 mΩ (Ref)

  • 4.

    Current Rating: Peak current (50% duty cycle) through primary (8-7) to cause 40°C temperature rise at 25°C ambient.

  • 5.

    SRF: Values are for reference only.

  • 6.

    Flammability Standard: Meets UL 94V-0.

  • 7.

    Terminating Resistor (RB): To calculate the value use the formula, RB = E0TR/Ip

  • 8.

    ET Product: The maximum ET is based upon a flux density of 3700 Gauss at 25°C. Suitable for bipolar applications only.

    ET = EO/2f
    EO = IPRB/TR

    Where as,

    EO = Output voltage (V)
    RB = Term. Resistor (Ω)
    IP = Primary Current (A)
    TR = Turns Ratio
    f = Frequency (Hz)

  • 9.

    Packaging

    • Reel Diameter: 13”
    • Reel Width: 16mm
    • Pieces/Reel: 1000
  • 10.

    Compliance & Solutions:

    RoHS Compliant    Custom Solutions

  • 11.

    Specifications subject to change without prior notice.

Frequently Asked Questions (FAQs)

How do I select the correct turns ratio for my controller or current-sense architecture?

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The correct turns ratio depends on the sense-voltage range required by your controller, the burden resistor value, and the accuracy needed across the operating current range. Higher ratios generate more sense voltage but increase burden dissipation, so selection requires balancing signal amplitude, thermal limits, controller input requirements, and the ET-product limits defined for each CT01 part number.

What burden resistor should I use with the CT01 Series?

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Choose a burden resistor that produces sufficient sense voltage for the controller while staying within the allowable ET-product and thermal ratings. ICE Components provides formulas relating burden value, turns ratio, output voltage, and primary current, allowing designers to size the resistor in a way that ensures reliable waveform reproduction and prevents core saturation.

Can CT01 be used in current-mode controlled SMPS?

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Yes. CT01 is well suited for current-mode, average-current, and protection-focused SMPS control schemes. When paired with the correct burden resistor and minimal filtering, the transformer delivers an isolated representation of the inductor or switch-node current that is appropriate for control loops and protection thresholds.

Does CT01 require specific PCB layout practices for best accuracy?

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Optimal performance is achieved by routing the primary path with minimal loop area, placing the burden resistor close to the secondary pins, and distancing high dV/dt switching traces from the transformer and sense lines. These practices reduce parasitic coupling and help maintain a clean, stable sense waveform.

Can CT01 measure pulsed or non-sinusoidal currents?

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Yes. CT01 is designed for switch-mode applications and can measure pulsed or non-sinusoidal currents as long as the volt-seconds applied remain within the ET-product limits for the specific part number. Appropriate burden selection and filtering help ensure waveform fidelity and prevent saturation.

Do I need external shielding when using CT01 in noise-sensitive applications?

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Most designs do not require additional physical shielding. Using a continuous ground plane beneath the transformer and maintaining distance from noisy switching nodes generally provides adequate noise immunity, even in high-dV/dt environments.

Is CT01 compatible with common SMPS controller ICs?

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Yes. CT01 can interface with a wide range of current-mode and protection-oriented SMPS controllers. Proper burden sizing ensures that the output waveform matches the input requirements of the specific controller being used.

How is CT01 typically inserted into the current path being measured?

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The current to be sensed is routed directly through the transformer’s primary pins, and the secondary winding, paired with the burden resistor, generates a scaled and isolated voltage proportional to that current. This configuration supports monitoring of switch-node, inductor-leg, or supply-rail currents.

What factors affect CT01’s accuracy at higher switching frequencies?

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Accuracy is influenced by the chosen burden resistor, the transformer’s leakage inductance and parasitic characteristics, PCB stray capacitances, and input filtering at the controller. Maintaining short secondary traces and minimizing capacitive coupling to noisy nodes help preserve signal integrity.

Where can I download models and supporting resources for CT01?

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The CT01 product page provides access to the datasheet, mechanical drawings, layout recommendations, and options to obtain SPICE and 3D models for simulation and CAD integration.