CR6237 Datasheet | Chip Rail

Features Up to 5% Precision for Constant Voltage Regulation and Constant Current Regulation at Universal AC input Primary-side Sensing and Regulation Without TL431 and Opto-coupler Flyback Topology In DCM Operation Soft-start Built-in Leading Edge Blanking (LEB) Frequency Jitter to Reduce System EMI Programmable CV and CC Regulation Adjustable Constant Current and Output Power Setting Built-in Secondary Constant Current Applications Cell Phone /Digital Cameras Charger Small Power Adaptor General Description CR623X is a high performance offline PWM power switch for low power AC/DC charger and adaptor applications. It operates in primary-side sensing and provides constant voltage (CV) and constant current (CC) regulation without TL431 and opto-coupler. A typical output CC/CV curve is shown as in the Fig.1. Fig.1. Typical CC/CV Curve Control with Primary Side Feedback Built-in Secondary Constant Voltage Sampling Controller Program Cable Drop pensation Rich Protections For System Reliability including VDD Under Voltage Lockout with Hysteresis (UVLO) Cycle-by-Cycle Current Limiting and Peak Current Protection (OCP) Over Temperature Protection (OTP) VDD Over Voltage Protection (OVP) VDD Clamp Lead-free SOP-8L & DIP-8L Auxiliary Power for PC, TV etc. Linear Regulator/RCC Replacement In CC mode, the current point and maximum output power setting can be adjusted by the sense resistor RS at CS pin. In CV mode, CR623X captures the auxiliary flyback signal at Pin INV and then regulates the output voltage. IN this mode, multi-mode operations are utilized to achieve high performance and high efficiency. In addition, built-in cable drop pensation further enhances output accuracy. CR623X offers power on soft-start control and ensures safe operation with plete protections against all the fault conditions. Built-in protection circuitry includes Cycle-by-Cycle current limiting, peak current protection, OTP，VDD OVP, VDD clamp and UVLO. Excellent EMI performance is achieved with...