CR6850D

CR6850D Novel Low Cost Green-Power PWM Controller Features Low Cost, PWM&PFM&CRM (Cycle Reset Mode) Low Start-up Current (about 8µA) Low Operating Current (about 2mA) Current Mode Operation Under Voltage Lockout (UVLO) Built-in Synchronized Slope Compensation Programmable PWM Frequency Audio Noise Free Operation Leading edge Blanking on Sense input Constant output power limiting for universal AC input Cycle-by-cycle current limiting Soft clamped gate output voltage 16.8V Over voltage protect 25.5V High-Voltage CMOS Process with ESD SOT-23-6L、SOP-8 & DIP-8 Pb-Free Packaging Applications Switching AC/DC Adaptor Battery Charger Open Frame Switching Power Supply 384X Replacement General Description The CR6850D is a highly integrated low cost current mode PWM controller, which is ideal for small power current mode of offline AC-DC fly-back converter applications. Making use of external resistors, the IC changes the operating frequency and automatically enters the PFM/CRM (Cycle Reset Mode) under light-load/zero-load conditions. This can minimize standby power consumption and achieve green-power functions. With a very low start-up current, the CR6850D could use a large value start-up resistor (2Mohm). Built-in synchronized slope compensation enhances the stability of the system and avoids sub-harmonic oscillation. Dynamic peak limiting circuit minimizes output power change caused by delay time of the system over a universal AC input range. Leading edge blanking circuit on current...