CR6851

CR6851 Novel Low Cost Green-Power PWM Controller With Soft Start & Frequency Jitter Feature z Low Cost, PWM&PFM&CRM (Cycle Reset Mode) z Low Start-up Current (about 1.5µA) z Low Operating Current (about 2.2mA) z Current Mode Operation z Under Voltage Lockout (UVLO) z Built-in Synchronized Slope Compensation z Built-in fixed soft start with 1.2mS z Built-in Frequency jitter for better EMI Signature z Programmable PWM Frequency z Audio Noise Free Operation z Leading edge Blanking on Sense input z Constant output power limiting for universal AC input Range z SOT-23-6L SOP8 and DIP-8 Pb-Free Packaging z Compatible with SG6848 (6849) / SG5701/SG5848/LD7535 (7550) / OB2262 (2263)/OB2278 2279 z Complete Protection with ¾ Soft Clamped GATE output voltage 16.5V ¾ VDD over voltage protect 25.6V ¾ Cycle-by-cycle current limiting ¾ Sense Fault Protect ion ¾ OTP (Over Temperature Protection) ¾ Output SCP (Short circuit Protection) ¾ Output OLP (Over Load Protection) ¾ Latch mode After OLP&SCP ¾ High-Voltage CMOS Process with ESD Applications z Switching AC/DC Adaptor z Battery Charger z Open Frame Switching Power Supply z Standby Power Supplies z Set-Top Box Power Supplies z 384X Replacement General Description The CR6851 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 ...