AC/DC Charger/Adapter

CT5601 Datasheet

CT5601 is a high performance current mode PWM controller for offline flyback converter applications. The CT5601 has built-in General Primary Side CC control, which simplifies isolated power supply design that requires CC regulation of the output.

In CT5601, PWM switching frequency with shuffling is fixed to 65 KHz and is trimmed to tight range. The CT5601 has built-in green and burst mode control for light and no load condition, which can achieve less than 75mW standby power for sub 30W applications.

The CT5601 integrates functions and protections of Under Voltage Lockout (UVLO), VCC over Voltage Protection (VCC OVP), Cycle-by-cycle Current Limiting (OCP), Short Circuit Protection (SCP), Over Load Protection (OLP), On-Chip Thermal Shutdown (OTP), Soft Start, VCC clamping and CS Pin Float Protection, etc

The CT5600 is available in SOT23-6 package


  • Primary Side Constant-Current (CC) Control for DCM and CCM Operation
  • ±5% CC Regulation; ±1% CV Regulation
  • Less than 75mW Standby Power
  • Fixed 65KHz Switching Frequency <70mW
  • Green Mode and Burst Mode Control
  • Very Low Startup and Operation Current
  • Built-in Frequency Shuffling to Reduce EMI
  • Built-in Current Mode Control with Internal Slope Compensation
  • Built-in Line & Inductance Compensation for CC Operation
  • Built-in Protections with Auto Recovery:
    • VCC Under Voltage Lockout (UVLO)
    • VCC Over Voltage Protection (OVP)
    • On-Chip Thermal Shutdown (OTP)
    • Cycle-by-Cycle Current Limiting
    • Over Load Protection (OLP)
    • Short Circuit Protection (SCP)
    • Leading Edge Blanking (LEB)
    • CS Pin Float Protection