參數(shù)資料
型號： MAX775CPA
廠商： MAXIM INTEGRATED PRODUCTS INC
元件分類： 穩(wěn)壓器
英文描述： Quadruple 2-Input Positive-AND Gates With Open-Collector Outputs 14-CDIP -55 to 125
中文描述： SWITCHING CONTROLLER, 300 kHz SWITCHING FREQ-MAX, PDIP8
封裝： 0.300 INCH, PLASTIC, DIP-8
文件頁數(shù)： 14/16頁
文件大?。?/td> 163K
代理商： MAX775CPA
Capac itors
Choose the output capacitor (C4 of Figures 2, 3, and 4)
to be consistent with your size, ripple, and output volt-
age requirements. Place capacitors in parallel if the
size you want is unobtainable. You will not only
increase the capacitance, but also decrease the
capacitor’s ESR (a major contributor of ripple). A
330μF tantalum output filter capacitor with 0.07
ESR
typically maintains 120mV
p-p
output ripple when
generating -5V at 1A from a 5V input. Smaller capaci-
tors 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:
OUT
x I
OUT
x ESR
V
p-p
=V
V
IN
When evaluating this equation, be sure to use the
capacitance value at the switching frequency. At
200kHz, the 330μF 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.
I
OUT
x t
OFF(min)
C
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.
M
-5V/-12V/-15V or Adjustable,
High-Efficiency, Low I
Q
Inverting DC-DC Controllers
14
______________________________________________________________________________________
Table 1. Component Suppliers
SUPPLIER
INDUCTORS
PHONE
FAX
Coiltronics
Gowanda
Sumida USA
Sumida J apan
CAPACITORS
(407) 241-7876
(716) 532-2234
(708) 956-0666
81-3-3607-5111
(407) 241-9339
(716) 532-2702
(708) 956-0702
81-3-3607-5144
Kemet
Matsuo
Nichicon
Sanyo USA
Sanyo J apan
Sprague
United Chemi-Con
DIODES
(803) 963-6300
(714) 969-2491
(708) 843-7500
(619) 661-6835
81-7-2070-6306
(603) 224-1961
(714) 255-9500
(803) 963-6322
(714) 960-6492
(708) 843-2798
(619) 661-1055
81-7-2070-1174
(603) 224-1430
(714) 255-9400
Motorola
Nihon USA
Nihon J apan
POWER MOSFETS
(800) 521-6274
(805) 867-2555
81-3-3494-7411
(602) 952-4190
(805) 867-2556
81-3-3494-7414
Harris
International Rectifier
Siliconix
CURRENT-SENSE RESISTORS
(407) 724-3729
(310) 322-3331
(408) 988-8000
(407) 724-3937
(310) 322-3332
(408) 970-3950
IRC
(704) 264-8861
(704) 264-8866
相關(guān)PDF資料
PDF描述
MAX775CSA -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC Controllers
MAX775EPA -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC Controllers
MAX775ESA -5V/-12V/-15V or Adjustable, High-Efficiency, Low IQ Inverting DC-DC Controllers
MAX775MJA Triple 3-Input Positive-NAND Gates 20-LCCC -55 to 125
MAX776CPA Triple 3-Input Positive-NAND Gates 14-CFP -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX775CSA 功能描述:DC/DC 開關(guān)控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX775CSA+ 功能描述:DC/DC 開關(guān)控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX775CSA+T 功能描述:DC/DC 開關(guān)控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX775CSA-T 功能描述:DC/DC 開關(guān)控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
MAX775EPA 功能描述:DC/DC 開關(guān)控制器 5/12/15/AdjV- Inv DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK
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