2500个 仙童Fairchild Semiconductor SG5841JSZ SOIC-8 PWM 电源管理芯片 Date 1235 全新库存现货

2500个 仙童Fairchild Semiconductor SG5841JSZ SOIC-8 PWM 电源管理芯片 Date 1235 全新库存现货

高度集成的SG5841/J系列PWM控制器具备多种特性，可提升反激式转换器的性能。 为最大限度降低待机功耗，其专有绿色模式功能可进行关断时间调制，在轻载条件下持续降低开关频率。该绿色模式功能使电源能够满足国际节能要求。为进一步降低功耗，SG5841/J采用BiCMOS工艺制造。这使得启动电流低至约14μA，工作电流仅为4mA。因此，可以使用较大的启动电阻。 内置的同步斜坡补偿实现了稳定的峰值电流模式控制。专有的内部锯齿波功率限制器可在90VAC至264VAC的宽交流输入电压范围内确保恒定的输出功率限制。 SG5841/J具备多种保护功能。除逐周期电流限制外，内部开环保护电路可在发生开环或输出短路故障时确保安全。PWM输出会被禁用，直到VDD降至欠压锁定（UVLO）下限以下，然后控制器重新启动。可应用外部NTC热敏电阻进行过温保护。 SG5841/J提供8引脚DIP或SOP封装。

商品特性

• 绿色模式PWM控制器
• 低启动电流：14μA
• 低工作电流：4mA
• 带跳频的可编程PWM频率
• 峰值电流模式控制
• 逐周期电流限制
• 同步斜坡补偿
• 前沿消隐（LEB）
• 恒定输出功率限制
• 带软驱动的图腾柱输出
• VDD过压钳位
• 可编程过温保护（OTP）
• 内部开环保护
• VDD欠压锁定（UVLO）
• GATE输出最大电压钳位：18V

应用领域

• 通用开关模式电源和反激式电源转换器，包括：
• 电源适配器、开放式开关电源

Description
The highly integrated SG5841/J series of PWM controllers provides several features to enhance the
performance of flyback converters.
To minimize standby power consumption, a proprietarygreen-mode function provides off-time modulation tocontinuously decrease the switching frequency at light-load conditions. This green-mode function enables thepower supply to meet international power conservationrequirements. To further reduce power consumption,SG5841/J is manufactured using the BiCMOS process.This allows a low startup current, around 14uA, and anoperating current of only 4mA. As a result, a largestartup resistance can be used.
The built-in synchronized slope compensation achievesstable peak-current-mode control. The proprietaryinternal sawtooth power-limiter ensures a constantoutput power limit over a wide range of AC inputvoltages, from 90VAc to 264VAc.
SG5841/J provides many protections. In addition tocycle-by-cycle current limiting, the internal open-loopprotection circuit ensures safety should an open-loop oroutput-short-circuit failure occur. PWM output isdisabled until Vop drops below the UVLO lower limit,then the controller restarts. An external NTC thermistorcan be applied for over-temperature protection.
SG5841/J is available in an 8-pin DIP or SOP package.

Features
Green-Mode PWM Controller
Low Startup Current : 14uA
Low Operating Current: 4mA
Programmable PWM Frequency with Hopping
Peak-Current-Mode Control
Cycle-by-Cycle Current Limiting
Synchronized Slope Compensation
Leading-Edge Blanking (LEB)
Constant Output Power Limit
Totem Pole Output with Soft Driving
Vop Over-Voltage Clamping
Programmable Over-Temperature Protection (OTP)
Internal Open-Loop Protection
Vop Under-Voltage Lockout (UVLO)
GATE Output Maximum Voltage Clamp:18V

Applications
flyback power converters, including:
General-purpose, switch-mode, power supplies and
Power AdaptersOpen-Frame SMPS