參數(shù)資料
型號(hào)： MAX253EUA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類(lèi)： 其它接口
英文描述： Transformer Driver for Isolated RS-485 Interface
中文描述： SPECIALTY INTERFACE CIRCUIT, PDSO8
封裝： UMAX-8
文件頁(yè)數(shù)： 15/16頁(yè)
文件大?。?/td> 230K
代理商： MAX253EUA
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 about 22 turns on
each side of the center tap, or 44 turns total. This will
result in a nominal primary inductance of about 832μH.
The secondary can be scaled to produce the required
DC output.
Diode S elec tion
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
0.1μF 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 0.1μF chip or
ceramic capacitor is normally sufficient for input
M
Transformer Driver for
Isolated RS -485 Interfac e
______________________________________________________________________________________
15
* Nihon Inter Electronics Corp.
USA Phone: (805) 867-2555
FAX: (805) 867-2556
J apan 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
J apan 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
J apan Phone: 81-7-5231-8461, FAX: 81-7-5256-4158
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX253EUA+ 功能描述:功率驅(qū)動(dòng)器IC Transformer Driver for Iso RS-485 Int RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX253EUA+T 功能描述:功率驅(qū)動(dòng)器IC Transformer Driver for Iso RS-485 Int RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX253EUA-T 功能描述:功率驅(qū)動(dòng)器IC RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX253MJA 功能描述:功率驅(qū)動(dòng)器IC Integrated Circuits (ICs) RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
MAX253MSA/PR 功能描述:功率驅(qū)動(dòng)器IC Transformer Driver for Isolated RS-485 Interface RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類(lèi)型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
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