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| 型号： | MAX253CSA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 7/18页 |
| 文件大小： | 0K |
| 描述： | IC XFRMR DRIVER RS485 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 100 |
| 类型： | 驱动器 |
| 驱动器/接收器数： | 1/0 |
| 规程： | RS232，RS485 |
| 电源电压： | 4.5 V ~ 5.5 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 管件 |
Transformer Driver for
Isolated RS-485 Interface
sensor, an extra several hundred milliwatts could easily
be supplied by the circuit, as shown. A 12V supply
could be generated by adding two more diodes to the
ends of the secondary, and a -5V supply could be gen-
erated by connecting additional diodes to the 1/4 and
3/4 tap points on the secondary. For 5V only applica-
tions, the MAX187 is recommended.
______________Component Selection
Transformer Selection
The transformer primary used with the MAX253 must be
a center-tapped winding with sufficient ET product to
prevent saturation at the worst-case lowest selected
frequency. The MAX253’s guaranteed minimum fre-
quency with the FS pin held low is 150kHz, equating to
a maximum period of 6.67s. The required ET product
for half the primary is simply the product of the maxi-
mum supply voltage and half the maximum period.
With FS connected high, the guaranteed minimum fre-
quency is 250kHz, giving a maximum period of 4s.
The secondary winding may or may not be center
tapped, depending on the rectifier topology used. The
phasing of the secondary winding is not critical. In
some applications, multiple secondaries might be
required. Half-wave rectification could be used, but is
discouraged because it normally adds a DC imbalance
to the magnetic flux in the core, reducing the ET prod-
uct. If the DC load is imbalanced, full-wave rectification
is recommended, as shown in Figure 9b.
The transformer turns ratio must be set to provide the
minimum required output voltage at the maximum
anticipated load with the minimum expected input volt-
Table 2. Typical Transformer Characteristics
Table 3. Transformer, Transformer Core, and Optocoupler Suppliers
CHARACTERISTIC
5V to ±10V
5V to 5V
3.3V to 5V
5V to 24V
5V to ±5V; ±12V
Figure
9a
2, 3, 5, 6
4, 7
8
10
Turns Ratio
1CT*:1
1CT:1.3CT
1CT:2.1CT
1CT:5CT
1CT:1.5CT:3CT
Primary
44CT
28CT
44CT
Typical
Windings
Secondary
44
56CT
220CT
66CT, 132CT
FS Low
18.3V-s
12V-s
18.3V-s
Primary ET
Product
FS High
11V-s
7.2V-s
11V-s
TRANSFORMERS
TRANSFORMER CORES
OPTOCOUPLERS
BH Electronics
Phone: (507) 532-3211
FAX: (507) 532-3705
Philips Components
Phone: (407) 881-3200
FAX: (407) 881-3300
Quality Technology
Phone: (408) 720-1440
FAX: (408) 720-0848
Coilcraft
Phone: (708) 639-6400
FAX: (708) 639-1469
Magnetics Inc.
Phone: (412) 282-8282
FAX: (412) 282-6955
Sharp Electronics
Phone: (206) 834-2500
FAX: (206) 834-8903
Coiltronics
Phone: (516) 241-7876
FAX: (516) 241-9339
Fair-Rite Products
Phone: (914) 895-2055
FAX: (914) 895-2629
Siemens Components
Phone: (408) 777-4500
FAX: (408) 777-4983
*CT = Center Tapped
MAX253
Maxim Integrated
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX253CSA+ | 功能描述:功率驱动器IC Transformer Driver for Iso RS-485 Int RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX253CSA+T | 功能描述:功率驱动器IC Transformer Driver for Iso RS-485 Int RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX253CSA-T | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX253CUA | 功能描述:功率驱动器IC RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
| MAX253CUA+ | 功能描述:功率驱动器IC Transformer Driver for Iso RS-485 Int RoHS:否 制造商:Micrel 产品:MOSFET Gate Drivers 类型:Low Cost High or Low Side MOSFET Driver 上升时间: 下降时间: 电源电压-最大:30 V 电源电压-最小:2.75 V 电源电流: 最大功率耗散: 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:SOIC-8 封装:Tube |
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