●Description
●The highly integrated FSBH-series consists of an integrated current-mode Pulse Width Modulator (PWM) and an avalanche-rugged 700V SenseFET. It is specifically designed for high-performance offline Switched-Mode Power Supplies (SMPS) with minimal external components.
●The integrated PWM controller features include a proprietary green-mode function that provides off-time modulation to linearly decrease the switching frequency at light-load conditions to minimize standby power consumption. To avoid acoustic-noise problems, the minimum PWM frequency is set above 18kHz. This green-mode function enables the power supply to meet
●international power conservation requirements. The PWM controller is manufactured using the BiCMOS process to further reduce power consumption. The FSBH-series turns off some internal circuits to improve power saving when VFBis lower than 1.6V, which allows an operating current of only 2.5mA.
●Features
●Brownout Protection with Hysteresis
●Built-In 5ms Soft-Start Function
●Internal Avalanche-Rugged 700V SenseFET
●Low Acoustic Noise During Light-Load Operation
●High-Voltage Startup
●Linearly Decreasing PWM Frequency to 18KHz
●Peak-Current-Mode Control
●Cycle-by-Cycle Current Limiting
●Leading-Edge Blanking (LEB)
●Synchronized Slope Compensation
●Internal Open-Loop Protection
●VDDUnder-Voltage Lockout (UVLO)
●VDDOver-Voltage Protection (OVP)
●Internal Auto-Restart Circuit (OVP, OTP)
●Constant Power Limit (Full AC Input Range)
●Internal OTP Sensor with Hysteresis
●Applications
●General-purpose switched-mode power supplies and flyback power converters, including:
●Auxiliary Power Supply for PC and Server
●SMPS for VCR, SVR, STB, DVD & DVCD Player, Printer, Facsimile, and Scanner
●Adapter for Camcorder
