RS2052 Datasheet | PTC

DESCRIPTION The RS2052 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 powersaving functions. With a very low start-up current, the RS2052 could use a large value start-up resistor (2MΩ). Built-in synchronized slope pensation enhances the stability of the system and avoids sub-harmonic oscillation. Dynamic peak current 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 sense input could remove the signal glitch due to snubbed circuit diode reverse recovery and thus greatly reduces the external ponent count and system cost in the design. Cycle-by-Cycle current limiting ensures safe operation even during short-circuit. Excellent EMI performance is achieved built-in soft driver and low EMI technique. APPLICATIONS - Switching AC/DC Adaptor - Open Frame Switching Power Supply - Standby Power Supplies - Set-Top Box Power Supplies 100m W Standby Power Green PWM Controller Features - Low standby power（<0.1W） - Low startup current (about 5μA) - Low operating current (about 1.5m A) - Power on Soft Start Reducing Power MOSFET Vds Stress - Adjustable OTP - Over Voltage (fixed or adjustable) Protection (OVP) - OLP, OVP and OTP coverage with auto- recovery - PWM&PFM&CRM Current Control Mode - Built-in Synchronized Slope pensation - Frequency shuffling for Excellent EMI Performance - Fixed 65KHz Switching Frequency - Audio Noise Free Operation - Leading edge Blanking on Sense input - Constant output power limiting for universal AC input Range - Soft Clamped GATE output voltage 12.0V - Good Protection Coverage With Under Voltage Lockout...