MAX1847

高效率、电流模式、反相PWM控制器


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说明

MAX1846/MAX1847高效率PWM反相控制器能帮助设计者在电信及网络应用中实现小尺寸、低噪声、负电压输出的DC-DC转换器。这两种器件工作于+3V至+16.5V,能产生-500mV至-200V的输出。为了尽可能减小开关噪声,两种器件都采用了电流型、恒定频率的PWM控制方案。工作频率可以通过电阻设置在100kHz至500kHz。

MAX1846采用超小型10引脚µMAX®封装。高工作频率、兼容陶瓷电容和无需变压器的反相拓扑适合于紧凑型设计。最低至100kHz的工作频率兼容电解电容,允许用户采用低成本外部元件。高电流输出驱动器设计用于驱动P沟道MOSFET,可以使转换器的输出高达30W的功率。

MAX1847具有时钟同步和关断的功能。MAX1847还可以配合一个N沟道MOSFET和变压器,构成反相反激式控制器,输出功率可达70W。MAX1847采用16引脚的QSOP封装。

电流模式控制简化了补偿,能提供良好的瞬态响应。通过低侧电流检测实现精确的电流模式控制和过流保护。
MAX1846、MAX1847:典型工作电路 MAX1846、MAX1847:典型工作电路 放大+

关键特性

  • 转换效率90%
  • 输入范围+3.0V至+16.5V
  • 输出范围-500mV至-200V
  • 驱动高侧P沟道MOSFET
  • 开关频率100kHz至500kHz
  • 电流型、PWM控制
  • 内部软启动
  • 电解或陶瓷输出电容
  • MAX1847还提供:
    • 同步至外部时钟及关断功能
    • 兼容N沟道开关的反相反激式拓扑

应用

  • 蜂窝基站
  • CO DSL线驱动器电源
  • 工业电源
  • 网络设备
  • 光网络设备
  • 服务器
  • SLIC电源
  • VoIP电源
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
IOUT1
(A)
Output Adjust. MethodDC-DC OutputsOper. Freq.
(kHz)
Switch TypePackage/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX1846 316.5-2-2005Resistor1500External
UMAX/10
$2.78 @1k
MAX1847 
QSOP/16
$3.09 @1k
查看所有Inverting Switching Regulators (22)
Pricing Notes:
价格仅供参考,用于同类产品的比较。所提供报价为美元,需要依汇率折合成人民币。该价格将因当地关税、税率和汇率而异。有关特定订购量和指定版本的报价和供货问题,请参考:价格与供货网站或与指定代理商联系。

型号   生产流程   工艺   样本量   不合格   FIT @ 25°C   FIT @ 55°C  

备注: 通过技术手段对故障率进行汇总,并映射到相关的材料部件号。 故障率与被测件的数量密切相关。

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