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參數(shù)資料
| 型號： | DS2282 |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | Digital Transmission Controller |
| 英文描述： | DATACOM, FRAMER, SMA30 |
| 文件頁數(shù)： | 6/16頁 |
| 文件大?。?/td> | 312K |
| 代理商： | DS2282 |
Capacitors
Choose the output capacitor (C4 of Figures 2, 3, and 4)
to be consistent with size, ripple, and output voltage
requirements. Place capacitors in parallel if the size
desired is unobtainable. This will not only increase the
capacitance, but also decrease the capacitor’s ESR (a
major contributor of ripple). A 330F tantalum output filter
capacitor with 0.07
ESR typically maintains 120mVP-P
output ripple when generating -5V at 1A from a 5V
input. Smaller capacitors are acceptable for lighter
loads or in applications that can tolerate higher output
ripple.
The value of C4 is chosen such that it acquires as
small a charge as possible during the switch on-time.
The amount of ripple as a function of capacitance is
give by:
VOUT x IOUT x ESR
IOUT x tOFF(min)
VP-P = _____________________ + _________________
VIN
C
When evaluating this equation, be sure to use the
capacitance value at the switching frequency. At
200kHz, the 330F tantalum capacitor of Figures 2, 3,
or 4 may degrade by a factor of ten, which will signifi-
cantly alter the ripple voltage calculation.
The ESR of both the bypass and filter capacitors also
affects efficiency. Best performance is obtained by
doubling up on the filter capacitors or using low-ESR
capacitors. Capacitors must have a ripple current rat-
ing equal to the peak current.
The smallest low-ESR SMT capacitors currently avail-
able are the Sprague 595D series. Sanyo OS-CON
organic semiconductor through-hole capacitors also
exhibit low ESR and are especially effective at low tem-
peratures. Table 1 lists the phone numbers of these
and other manufacturers.
PC Layout and Grounding
Due to high current levels and fast switching wave-
forms, proper PC board layout is essential. Use a star
ground configuration; connect the ground lead of the
input bypass capacitor, the output capacitor, the induc-
tor, and the GND pin of the MAX774/MAX775/MAX776
at a common point very close to the device. Addi-
tionally, input capacitor C2 (Figures 3 and 4) should be
placed extremely close to the device.
If an external resistor divider is used (Figures 3 and 4),
the trace from FB to the resistors must be extremely short.
MAX774/MAX775/MAX776
-5V/-12V/-15V or Adjustable, High-Efficiency,
Low IQ Inverting DC-to-DC Controllers
14
______________________________________________________________________________________
Table 1. Component Suppliers
SUPPLIER
PHONE
FAX
Coiltronics
(407) 241-7876
(407) 241-9339
Gowanda
(716) 532-2234
(716) 532-2702
Sumida Japan
81-3-3607-5111
81-3-3607-5144
Sumida USA
(708) 956-0666
(708) 956-0702
Kemet
(803) 963-6300
(803) 963-6322
Matsuo
(714) 969-2491
(714) 960-6492
Nichicon
(708) 843-7500
(708) 843-2798
Sanyo Japan
81-7-2070-6306
81-7-2070-1174
Sanyo USA
(619) 661-6835
(619) 661-1055
Sprague
(603) 224-1961
(603) 224-1430
United Chemi-Con
(714) 255-9500
(714) 255-9400
Motorola
(800) 521-6274
(602) 952-4190
Nihon USA
81-3-3494-7411
81-3-3494-7414
Nihon Japan
(805) 867-2555
(805) 867-2556
Harris
(407) 724-3729
(407) 724-3937
International Rectifier
(310) 322-3331
(310) 322-3332
Siliconix
(408) 988-8000
(408) 970-3950
IRC
(704) 264-8861
(704) 264-8866
INDUCTORS
CAPACITORS
DIODES
POWER MOSFETS
CURRENT-SENSE RESISTORS
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| DS2282/87-22282-000 | 功能描述:網(wǎng)絡(luò)控制器與處理器 IC RoHS:否 制造商:Micrel 產(chǎn)品:Controller Area Network (CAN) 收發(fā)器數(shù)量: 數(shù)據(jù)速率: 電源電流（最大值）:595 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PBGA-400 封裝:Tray |
| DS2282-113 | 功能描述:IC CTRLR/MON STIK T1 FDL 30-PIN RoHS:否 類別:集成電路 (IC) >> 接口 - 控制器 系列:- 標(biāo)準包裝:4,900 系列:- 控制器類型:USB 2.0 控制器 接口:串行 電源電壓:3 V ~ 3.6 V 電流 - 電源:135mA 工作溫度:0°C ~ 70°C 安裝類型:表面貼裝 封裝/外殼:36-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:36-QFN（6x6） 包裝:* 其它名稱:Q6396337A |
| DS2286-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS2287-32 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
| DS2287-8 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog IC |
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