RS2528 700V High Voltage Green Mode PWM Power Switch DESCRIPTION RS2528 is a highly integrated current mode PWM power switch. It built in patent High voltage startup, optimized for high performance, exhibit extra low standby power consumption (<30mW) and costs effective offline flyback converter applications. PWM switching frequency at normal operation is internally fixed. At no load or light load condition, it operates in burst mode to minimize switching loss. Less than 30mW standby power consumption and very high conversion efficiency is thus achieved. Patent high voltage startup is implemented in RS2528, which features with short startup time and extra low standby current. RS2528 offers rich protections with auto-recovery including Cycle-by-Cycle current limiting (OCP), over load protection (OLP), VDD under voltage lockout (UVLO), and over temperature protection (OTP), VDD over voltage protection (OVP). It also provides the protection with latched shut down including V DD over voltage protection. Excellent EMI performance is achieved with RS2528 proprietary frequency burst technique. The frequency at below 22KHz is minimized to avoid audible noise during operation. FEATURES Built-in 700V high voltage startup Patent High voltage startup technique Extra low standby (<30mW) Integrated with HV MOSFET Power on soft startup Frequency spreading to minimize EMI Audio noise free operation Fixed 65KHz switching frequency Comprehensive protection - VDD under voltage lockout with hysteresis (UVLO) - Cycle-by-Cycle over current protection (OCP) - Overload protection (OLP) with auto-recovery - Over temperature protection (OTP) with auto-recovery - VDD over voltage protection (OVP) with auto-recovery APPLICATIONS Offline AC/DC flyback converter for - AC/DC adapter - PDA power supplies - Digital cameras and camcorder adapter - VCR, SVR, STB, DVD&DVCD player SMPS - Set-Top box power - Auxiliary power supply for PC and server - Open-frame SMPS Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, No. 233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan RS2528 BLOCK DIAGRAM Drain 5/6 VDD Latch Soft Driver Logic Control Internal supply R CS Float Q Soft-Start S LVDD Green model OSC OCP UVLO Slope compensation POR VDD 2 LEB 4 CS 3 FB Vth CPL OVP 5V VDD clamper Burst model PWM Compartor Debounce GND V1.0 OLP 7/8 2 December 2013 RS2528 APPLICATION CIRCUIT V1.0 3 December 2013 RS2528 ORDER INFORMATION DEVICE RS2528 Y Z DEVICE CODE Y is package & Pin Assignments designator : P : DIP-8 Z is Lead Free designator : P: Commercial Standard, Lead (Pb) Free and Phosphorous (P) Free Package PIN CONFIGURATION NC 1 8 GND VDD 2 7 GND FB 3 6 Drain CS 4 5 Drain PIN DESCRIPTION Pin Name NC VDD FB CS GND Drain V1.0 Description Pin No. No Connect 1 Power Supply Feedback input pin. The PWM duty cycle is determined by voltage level into this pin and the current-sense signal at CS pin. Current sense input. 2 Ground HV MOSFET Drain Pin. The Drain pin is connected to the primary lead of the transformer. 5, 6 4 3 4 7, 8 December 2013 RS2528 IMPORTANT NOTICE Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements, improvements, and other changes to its products and to discontinue any product without notice at any time. PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No circuit patent licenses are implied. Princeton Technology Corp. 2F, 233-1, Baociao Road, Sindian Dist., New Taipei City 23145, Taiwan Tel: 886-2-66296288 Fax: 886-2-29174598 http://www.princeton.com.tw V1.0 11 December 2013