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參數(shù)資料
| 型號： | MAX253MJA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 其它接口 |
| 英文描述： | Transformer Driver for Isolated RS-485 Interface |
| 中文描述： | SPECIALTY INTERFACE CIRCUIT, CDIP8 |
| 封裝： | CERAMIC, DIP-8 |
| 文件頁數(shù)： | 14/16頁 |
| 文件大?。?/td> | 230K |
| 代理商： | MAX253MJA |
M
Transformer Driver for
Isolated RS -485 Interfac e
14
______________________________________________________________________________________
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 S elec tion
T ransformer S elec tion
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 6.67μs. 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 tied high, the guaranteed minimum frequency
is 250kHz, giving a maximum period of 4μs.
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
44CT
28CT
44CT
44CT
Typical
Windings
Secondary
44
56CT
56CT
220CT
66CT, 132CT
FS Low
18.3V-μs
18.3V-μs
12V-μs
18.3V-μs
18.3V-μs
Primary ET
Product
FS High
11V-μs
11V-μs
7.2V-μs
11V-μs
11V-μs
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: (407) 241-7876
FAX: (407) 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
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| MAX253MSA/PR | 功能描述:功率驅(qū)動器IC Transformer Driver for Isolated RS-485 Interface RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX253MSA/PR-T | 功能描述:功率驅(qū)動器IC 1W Primary-Side Transformer H-Bridge Driver for Isolated Supplies RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 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 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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| MAX2547_99-RD0203 | 制造商:Maxim Integrated Products 功能描述:EVAL BOARD - Boxed Product (Development Kits) |
| MAX2547ELM+ | 制造商:Maxim Integrated Products 功能描述:WCDMA/HSPA BAND I RF-TO-BITS FEMTO-BASES |
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