The CT5503S is a high performance AC/DC power supply controller for battery charger and adapter applications. The CT5503S uses Pulse Frequency Modulation (PFM) method to build discontinuous conduction mode (DCM) fly-back power supplies.
The CT5503S provides accurate constant voltage, constant current (CV/CC) regulation without requiring an opto-coupler and the secondary control circuitry. The CT5503S can achieve excellent regulation and high average efficiency, meet CEC DOE VI & CoC V5.
The CT5503S has a proprietary cable voltage drop compensation function. Internal random frequency modulation to reduce system EMI.
The CT5503S 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 .