MAX17497A

AC-D和DC-DC峰值电流模式转换器,集成降压稳压器

单芯片智能电表电源方案,简化设计并降低成本


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说明

MAX17497A/MAX17497B集成了电流模式、固定频率反激转换器和同步降压稳压器。器件提供设计宽输入电压范围、非隔离电源所需的全部控制电路,为智能电表、工业控制以及其它类似应用提供多路供电输出。MAX17497A带有上升/下降欠压锁定(UVLO)门限,优化于通用型离线式(85V AC至265V AC)电源;MAX17497B支持欠压锁定(UVLO),适合低压DC-DC转换器设计。两款器件均提供3.3V、固定输出同步降压稳压器,负载电流可达600mA。

MAX17497A反激转换器的开关频率为250kHz,MAX17497B反激/boost转换器的开关频率为500kHz。两款器件内部带有补偿的同步降压稳压器工作在1MHz开关频率,较高的工作频率允许使用小尺寸磁元件和滤波元件,支持紧凑的高性价比电源设计。EN/UVLO输入允许用户在所要求的输入电压下启动,也可作为开/关控制引脚。OVI引脚提供输入过压保护机制,当直流输入电压超出最大限制时可靠关断转换器。

可编程限流允许使用尺寸适中的原边开关FET,并为其提供保护。器件支持高于92%的最大占空比,并提供可编程斜率补偿,优化控制环路性能。器件带有漏极开路RESETN输出,用作上电就绪指示,当反激/boost转换器以及3.3V降压稳压器输出达到稳定电压时,进入高阻状态。可通过SSF引脚设置反激/boost转换器的软启动时间,3.3V降压稳压器采用内部数字软启动,限制浪涌电流。打嗝式过流保护以及热关断保护能够在发生过流、过热故障条件下将热耗降至最小。器件采用节省空间的16引脚(3mm × 3mm) TQFN封装,引脚间距为0.5mm。

MAX17497A, MAX17497B: Typical Startup Circuit MAX17497A, MAX17497B: Typical Startup Circuit 放大+

关键特性

  • 节省元件数量和电路板面积
    • 集成内部补偿的反激/boost转换器和降压稳压器
    • 无需检流电阻
    • 节省空间的16引脚(3mm × 3mm) TQFN封装
  • 最小辐射干扰
    • 离线式电源工作在250kHz开关频率,降低智能电表的无线接收器干扰
  • 浪涌电流抑制
    • 可编程反激/boost软启动
    • 降压稳压器采用内部数字式软启动
  • 故障状态下降低功耗
    • 打嗝式过流保护
    • 带有滞回的热关断
  • 可靠保护特性
    • 可编程反激/boost电流限制
    • 输入过压保护
  • 优化环路性能
    • 反激/boost可编程斜率补偿,提供最大相位裕量
  • 高效
    • 低RDSON、150mΩ、65V额定耐压的nMOSFET
    • 3.3V降压稳压器效率高于90%
  • 可选择频谱扩展

应用

  • 智能电表AC/DC电源
  • 通用输入、离线式AC-DC电源
  • 宽范围DC输入、反激/boost工业电源
Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. MethodIOUT1
(A)
Switch TypeSynchronous SwitchingDC-DC OutputsOper. Freq.
(kHz)
Package/PinsBudgetary
Price
minmaxminmaxSee Notes
MAX17497A 4.5361.251003.3
Preset
Resistor
0.6
External
Internal
Yes2
250
500
TQFN/16
$1.47 @1k
查看所有Step-Down Switching Regulators (388)

Part NumberVIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
IOUT1
(A)
IOUT1
(A)
Output Adjust. MethodSwitch TypeSynchronous SwitchingICC
(mA)
Oper. Freq.
(kHz)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
minmaxminmaxmaxSee Notes
MAX17497B 4.5367483.30.30.6
Preset
Resistor
InternalYes4.5500
TQFN/16
-40 to +125$1.63 @1k
查看所有Step-Down/Up Switching Regulators (30)
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。


MAX17497AEVKIT: MAX17497A评估板

技术资料

用户指南 5861 EE-SIM Design and Simulation Environment User Guide

质量和环境数据

申请可靠性报告: MAX17497A 
无铅封装的锡(Sn)晶须报告
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。

质量管理体系 >
环境管理体系 >

 
Status:
Package:
Temperature:

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    类型 编号 PDF 标题
    用户指南 5861 EE-SIM Design and Simulation Environment User Guide
    类型 编号 标题
    评估板7844MAX17497AEVKIT MAX17497A评估板