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Offline Regulators | FSBH0270NY_F116

700V Integrated Power Switch for 16Watt offline flyback converters, 100kHz, Brown In/Out Protection

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Overview

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 VFB is lower than 1.6V, which allows an operating current of only 2.5mA.
The FSBH-series has built-in synchronized slope compensation to achieve stable peak-current-mode control. The proprietary external line compensation ensures constant output power limit over a wide AC input voltage range, from 90VAC to 264VAC.
The FSBH-series provides many protection functions. In addition to cycle-by-cycle current limiting, the internal open-loop protection circuit ensures safety when an open-loop or output short occurs. PWM output is disabled until VDD drops below the VTH-OLP, then the controller starts up again. As long as VDD exceeds 28V, the internal OVP circuit is triggered.
Compared with a discrete MOSFET and controller or RCC switching converter solution, the FSBH-series reduces component count, design size, and weight; while increasing efficiency, productivity, and system reliability. These devices provide a basic platform that is well suited for the design of cost-effective flyback converters, such as in PC auxiliary power supplies.

  • Desktop PC
  • LCD TV
  • PDP TV
  • 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
  • VDD Under-Voltage Lockout (UVLO)
  • VDD Over-Voltage Protection (OVP)
  • Internal Auto-Restart Circuit (OVP, OTP)
  • Constant Power Limit (Full AC Input Range)
  • VIN Pin for Pull-HIGH Latch Function and Pull-LOW
  • Internal OTP Sensor with Hysteresis
  • Auto-Recovery Protection

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FSBH0270NY-F116

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