The CT11 series PCB-mount high-frequency current sense transformer is designed for switching power supply (SMPS) applications. It provides output feedback signals to pulse control circuits, enabling low-cost power regulation.Rated primary current is 25A (maximum 40A). Frequency range is up to 500kHz.The product uses a high-permeability ferrite core. Seven standard turns ratio options are available: 1:50, 1:100, 1:150, 1:200, 1:300, 1:500, and 1:1000, suitable for different detection accuracy requirements.The low-profile PCB-mount design is available in multiple structural styles.It is widely used in switching power supplies, lighting control, and switch control applications.
Notes: Product specifications can be customized
Q: What is the function of the CT11 series in switching power supplies?
A: The CT11 series current sense transformer detects primary side current and provides feedback signals to the pulse control circuit, enabling low-cost closed-loop regulation for switching power supplies. By sensing current changes, the control circuit adjusts the PWM duty cycle to achieve output voltage regulation and overcurrent protection.
Q: How to choose the right turns ratio?
A: Turns ratio selection depends on the primary current range and the required secondary sampling voltage. A lower turns ratio (e.g., 1:50) has fewer secondary turns, higher output current, and is suitable for larger current sensing. A higher turns ratio (e.g., 1:1000) has more secondary turns, lower output current, and is suitable for smaller currents or applications requiring higher output voltage. We recommend selecting based on the peak primary current and the sensitivity of the downstream sampling circuit.