توضیحات
آيسي BH0170A يک ايسي Green Mode Power Switch
که براي منبع تغذيه هاي (SMPS) با کمترين قطعات خارجي طراحي شده.
ويژگي ها:
*محافظ Brown out با هيستريس
*مدار سافت استارت داخلي 5 ميلي ثانيه
*Internal Avalanche-Rugged 700V SenseFET
*استارتاپ با هاي ولتاژ
*مدار Auto-Restart داخلي
**کاربرد ها :
*منبع تغذيه هاي سوييچينگ
*منبع تغذيه هاي فلاي بک
*پرينتر، اسکنر
Description
Green Mode Fairchild Power Switch
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
Switch 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 total 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 costeffective flyback converters, such as in PC auxiliary
Features:
?* Brownout Protection with Hysteresis
?* Built-In 5ms Soft-Start Function
? *Internal Avalanche-Rugged 700V SenseFET
? *No 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)
? *Internal OTP Sensor with Hysteresis
? *VIN Pin for Pull-HIGH Latch Function and *PullLOW Auto-Recovery Protection
**Applications
*General-purpose switch-mode power supplies
*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
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