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CS2845LN8

CS2845LN8

  • 厂商:

    CHERRY

  • 封装:

  • 描述:

    CS2845LN8 - Current Mode PWM Control Circuit with 50% Max Duty Cycle - Cherry Semiconductor Corporat...

  • 详情介绍
  • 数据手册
  • 价格&库存
CS2845LN8 数据手册
CS2844/3845 SERIES CS2844/CS3844 CS2845/CS3845 Current Mode PWM Control Circuit with 50% Max Duty Cycle Description The CS3844/45 provides all the necessary features to implement off-line fixed frequency current-mode control with a minimum number of external components. The CS3844 family incorporates a new precision temperature-controlled oscillator to minimize variations in frequency. An internal toggle flip-flop, which blanks the output every other clock cycle, limits the duty-cycle range to less than 50%. An undervoltage lockout ensures that VREF is stabilized before the output stage is enabled. In the CS2844/CS3844 turn on occurs at 16V and turn off at 10V. In the CS2845/CS3845 turn on is at 8.4V and turn off at 7.6V. Other features include low start-up current, pulse-by-pulse current limiting, and a high-current totem pole output for driving capacitive loads, such as gate of a power MOSFET. The output is low in the off state, consistent with N-channel devices. Features s Optimized for Offline Control s Temp. Compensated Oscillator s 50% Max Duty-cycle Clamp s VREF Stabilized before Output Stage is Enabled s Low Start-up Current s Pulse-by-pulse Current Limiting s Improved Undervoltage Lockout s Double Pulse Suppression s 1% Trimmed Bandgap Ref. s High Current Totem Pole Output Absolute Maximum Ratings Supply Voltage (ICC
CS2845LN8
物料型号: - CS2844LN8(8L PDIP) - CS2844LD14(14LSO) - CS2844LDR14(14L SO,卷带和卷盘) - CS2844LDW16(16L SO Wide) - CS2844LDWR16(16L SO Wide,卷带和卷盘) - CS2845LN8(8L PDIP) - CS2845LDW16(16L SO Wide) - CS2845LDWR16(16L SO Wide,卷带和卷盘) - CS3844GN8(8L PDIP) - CS3844GD8(8LSO) - CS3844GDR8(8L SO,卷带和卷盘) - CS3844GD14(14L SO) - CS3844GDR14(14L SO,卷带和卷盘) - CS3844GDW16(16L SO Wide) - CS3844GDWR16(16L SO Wide,卷带和卷盘) - CS3845GN8(8L PDIP) - CS3845GD8(8L SO) - CS3845GDR8(8L SO,卷带和卷盘) - CS3845GD14(14L SO) - CS3845GDR14(14L SO,卷带和卷盘) - CS3845GDW16(16L SO Wide) - CS3845GDWR16(16L SO Wide,卷带和卷盘)

器件简介: CS3844/45是一款提供所有必要的特性以实现离线固定频率电流模式控制的集成电路,最少的外部组件数量。CS3844家族集成了一个新的精密温度控制振荡器,以最小化频率变化。内部触发器在每个时钟周期翻转输出,限制占空比范围在50%以下。欠压锁定确保在输出阶段启用之前$V_{REF}$稳定。

引脚分配: - 8L PDIP/SO:1号引脚为COMP,2号引脚为VFB,3号引脚为Sense,4号引脚为OSC,5号引脚为Gnd,6号引脚为VoUT,7号引脚为VccPwr,8号引脚为Vcc。 - 14L SO Narrow:1号引脚为COMP,3号引脚为VFB,5号引脚为Sense,7号引脚为OSC,9号引脚为Gnd,10号引脚为Pwr Gnd,11号引脚为VoUT,12号引脚为VccPwr,14号引脚为Vcc。 - 16L SO Wide:3号引脚为COMP,4号引脚为VFB,5号引脚为Sense,6号引脚为OSC,10号引脚为Gnd,11号引脚为Pwr Gnd,12号引脚为VoUT,13号引脚为VccPwr,14号引脚为Vcc。

参数特性: - 输出电压:4.95V至5.10V - 线路调节:6mV至20mV - 负载调节:6mV至25mV - 温度稳定性:0.2mV/°C至0.4mV/°C - 总输出变化:4.90V至5.18V - 输出噪声电压:50uV至5uV - 长期稳定性输出短路:-30mA至-180mA

功能详解: CS3844/45系列集成电路优化了离线控制,具有温度补偿的振荡器、最大50%占空比限制、钳位VREF在输出阶段启用前稳定、低启动电流、逐脉冲电流限制、改进的欠压锁定、双脉冲抑制、1%修剪的带隙参考、高电流图腾柱输出。

应用信息: 适用于需要离线控制的应用,例如电源转换器。

封装信息: - 8 Lead PDIP - 8 Lead SO Narrow - 14L SO Narrow - 16L SO Wide
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