MAX253

1W原边变压器H桥驱动器,用于隔离电源


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说明

The MAX253 monolithic oscillator/power-driver is specifically designed to provide isolated power for an isolated RS-485 or RS-232 data interface. The device drives a center-tapped transformer primary from a 5V or 3.3V DC power supply. The secondary can be wound to provide any isolated voltage needed at power levels up to 1W.

The MAX253 consists of a CMOS oscillator driving a pair of N-channel power switches. The oscillator runs at double the output frequency, driving a toggle flip-flop to ensure 50% duty cycle to each of the switches. Internal delays are arranged to ensure break-before-make action between the two switches.

The SD pin puts the entire device into a low-power shutdown state, disabling both the power switches and oscillator.
MAX253:典型工作电路 MAX253:典型工作电路 放大+

关键特性

  • Simple Power-Supply Transformer Driver Design for Isolated RS-485/RS-232 Data-Interface Applications
    • Single 5V or 3.3V Supply
    • Low-Current Shutdown Mode: 0.4µA
    • Pin-Selectable Frequency: 350kHz or 200kHz
  • 8-Pin DIP, SO, and µMAX® Packages Take Minimal Board Space

应用

  • 桥接地电位差
  • 高噪声抑制通信接口
  • 隔离型和/或高压电源
  • 隔离型RS-485/RS-232电源
  • 医疗装置
  • 过程控制
  • 变压器驱动器
Part NumberVIN
(V)
VIN
(V)
Driver Output Resistance
(Ω)
Max. IOUT
(A)
TopologyFreq.
(kHz)
ICC
(mA)
Package/PinsOper. Temp.
(°C)
Budgetary
Price
minmaxmaxmaxSee Notes
MAX253 2.5640.2Push-Pull3500.45
CDIP/8
PDIP/8
SOIC (N)/8
UMAX/8
-55 to +125
-40 to +85
0 to +70
$1.49 @1k
查看所有Transformer Drivers (6)
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。

工具和模型

  • MAX253宏模型
  • 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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