DESCRIPTION
The RS2051 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 Burst/CRM (Cycle Reset Mode) under light-load/zero-load conditions. This can minimize standby power consumption and achieve power-saving functions. With a very low start-up current, the RS2051 could use a large value start-up resistor (2MΩ). Built-in synchronized slope compensation enhances the stability of the system and avoids sub-harmonic oscillation.

FEATURES
• Low Cost, PWM, Burst & CRM (Cycle Reset Mode)
• Low Operating Current (1.2mA)
• Low Start-up Current (about 3μA)
• Under Voltage Lockout (UVLO)
• Built-in Synchronized Slope Compensation
• Built-in Frequency Jiggling for better EMI Signature
• Programmable PWM Frequency
• Audio Noise Free Operation
• Soft Clamped GATE output voltage 18V
• VDD over voltage protect 34V
• Cycle-by-cycle current limiting
• Sense Fault Protect ion
• Latch mode After OLP&SCP
• RoHS Compliant and 100% Lead (Pb)-Free

APPLICATIONS
• Switching AC/DC Adaptor
• Battery Charger
• Open Frame Switching Power Supply
• Standby Power Supplies
• VCR, SVR, STB, DVD & DVCD Player SMPS
• Auxiliary Power Supply for PC and Server
• Open-frame SMPS