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参数资料
| 型号： | MAX253CSA |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 8/18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
age. In addition, include in the calculations an
allowance for worst-case losses in the rectifiers. Since
the turns ratio determined in this manner will ordinarily
produce a much higher voltage at the secondary under
conditions of high input voltage and/or light loading, be
careful to prevent an overvoltage condition from occur-
ring (see Output Voltage vs. Load Current in the
Typical
Operating Characteristics).
Transformers used with the MAX253 will ordinarily be
wound on high-permeability magnetic material. To min-
imize radiated noise, use common closed-magnetic-
path physical shapes (e.g., pot cores, toroids, E/I/U
cores). A typical core is the Philips 213CT050-3B7,
which is a toroid 0.190” in diameter and 0.05” thick.
For operation with this core at 5.5V maximum supply
voltage, the primary should have approximately 22
turns on each side of the center tap, or 44 turns total.
This will result in a nominal primary inductance of
approximately 832H. The secondary can be scaled to
produce the required DC output.
Diode Selection
The MAX253’s high switching frequency demands
high-speed rectifiers. Schottky diodes are recom-
mended. Ensure that the Schottky diode average cur-
rent rating exceeds the load-current level. The 1N5817
is a good choice for through-hole applications, and the
NIEC* SB05W05C dual in an SOT-23 package is rec-
ommended for surface-mount applications. Use the
higher frequency setting to reduce ripple.
Output Filter Capacitor
In applications sensitive to output-ripple noise, the out-
put filter capacitor C2 should have a low effective
series resistance (ESR), and its capacitance should
remain fairly constant over temperature. Sprague 595D
surface-mount solid tantalum capacitors and Sanyo
OS-CON through-hole capacitors are recommended
due to their extremely low ESR. Capacitor ESR usually
rises at low temperatures, but OS-CON capacitors pro-
vide very low ESR below 0°C.
In applications where output ripple is not critical, a
0.1F chip or ceramic capacitor is sufficient. Refer to
Table 4 for suggested capacitor suppliers. Use the
higher frequency setting to reduce ripple.
Input Bypass Capacitor
The input bypass capacitor C1 is not critical. Unlike
switching regulators, the MAX253’s supply current is
fairly constant, and is therefore less dependent on the
input bypass capacitor. A low-cost 0.1F chip or
ceramic capacitor is normally sufficient for input
bypassing.
* Nihon Inter Electronics Corp.
USA Phone: (805) 867-2555
FAX: (805) 867-2556
Japan Phone: 81-3-3494-7411
FAX: 81-3-3494-7414
Table 4. Suggested Capacitor Suppliers
PRODUCTION METHOD
CAPACITORS
Surface Mount
Matsuo
267 series (low ESR)
USA Phone: (714) 969-2491, FAX: (714) 960-6492
Sprague Electric Co.
595D/293D series (very low ESR)
USA Phone: (603) 224-1961, FAX: (603) 224-1430
Murata Erie
Ceramic
USA Phone: (800) 831-9172, FAX: (404) 436-3030
High-Performance
Through Hole
Sanyo
OS-CON series (very low ESR)
USA Phone: (619) 661-6835, FAX: (619) 661-1055
Japan Phone: 81-7-2070-1005, FAX: 81-7-2070-1174
Through Hole
Nichicon
PL series (low ESR)
USA Phone: (708) 843-7500, FAX: (708) 843-2798
Japan Phone: 81-7-5231-8461, FAX: 81-7-5256-4158
MAX253
16
Maxim Integrated
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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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