AC/DC Charger/Adapter

CT5502S Datasheet

The CT5502S is a high performance AC/DC power supply controller for battery charger and adapter applications. The CT5502S uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) fly-back power supplies.

The CT5502S provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and the secondary control circuitry.The CT5502S can achieve excellent regulation and high average efficiency, meet CEC DOE VI & CoC V5.

The CT5502S has a proprietary cable voltage drop compensation function. Internal random frequency modulation to reduce system EMI.

The CT5502S integrates functions and protections of Under Voltage Lockout (UVLO), VDD over Voltage Protection (VDD OVP), Cycle-by-cycle Current Limiting (OCP), Short Load Protection (SLP), On-Chip Thermal Shutdown, VDD Clamping, etc The CT5502S is available in SOP-7 package.


  • Built-in 800V BJT
  • Quasi-Resonant Primary Side Regulation (QR-PSR) Control with High Efficiency
  • Standby power <70mw
  • Low stat-up current <1uA
  • High efficiency(Meet Energy Star 6.0)
  • Multi-Mode PSR Control
  • Fast Dynamic Response
  • Built-in Dynamic Base Drive
  • Audio Noise Free Operation
  • ±5% CC and CV Regulation
  • Programmable Cable Drop Compensation (CDC) in CV Mode
  • Built-in AC Line & Load CC Compensation
  • Build in Protections
    • Short Load Protection (SLP)
    • Cycle-by-Cycle Current Limiting (OCP)
    • Leading Edge Blanking (LEB)
    • On-Chip Thermal Shutdown (OTP)
    • VDD OVP & UVP & Clamp