參數(shù)資料
型號： DS21Q48N
廠商： DALLAS SEMICONDUCTOR
元件分類： Digital Transmission Interface
英文描述： DATACOM, PCM TRANSCEIVER, PBGA144
封裝： BGA-144
文件頁數(shù)： 5/16頁
文件大?。?/td> 296K
代理商： DS21Q48N
MAX863
Dual, High-Efficiency, PFM, Step-Up
DC-DC Controller
______________________________________________________________________________________
13
Voltage ripple is the sum of contributions associated
with ESR and the capacitor value, as shown below:
VRIPPLE
VRIPPLE,ESR + VRIPPLE,C
To simplify selection, assume that 75% of the ripple
results from ESR and that 25% results from the capaci-
tor value. Voltage ripple as a consequence of ESR is
approximated by:
VRIPPLE,ESR
RESR x IPEAK
so:
Estimate input and output capacitor values for a given
voltage ripple as follows:
where V is the input or output voltage, depending on
which capacitor is being calculated.
Choose input capacitors with working voltage ratings
over the maximum input voltage, and output capacitors
with working voltage ratings higher than their respec-
tive outputs.
Add VDD and REF Bypass Capacitors
Bypass the MAX863 with 0.1F or higher value ceramic
capacitors placed as close to the VDD, REF, and GND
pins as possible.
Set the Output Voltage
DC-DC converter 1 operates with a 3.3V, 5V, or
adjustable output. For a preset output, connect
SENSE1 to OUT1 (Figures 2 and 4a), then set FB1 to
VDD for 3.3V operation or to GND for 5V operation. For
an adjustable output, connect a resistor voltage divider
to the FB1 pin (Figure 7). In adjustable output circuits,
connect SENSE1 to GND.
DC-DC converter 2 can be adjusted from very high
voltages down to VIN using external resistors connect-
ed to the FB2 pin, as shown in Figure 7. Select feed-
back resistor R2 in the 10k
to 500k range. R1 is
given by:
where 1.25V is the voltage of the internal reference.
R1 = R2
V
1.25V
OUT
1
C
0.5L x I
Vx V
2
PEAK
RIPPLE,C
≥
R
V
I
ESR
RIPPLE,ESR
PEAK
≤
MAX863
FB1 OR FB2
COUT
C1
(OPTIONAL)
R1
R2
C2
(OPTIONAL FOR HIGH-
VOLTAGE CIRCUITS)
VOUT1 OR VOUT2
Figure 7. Adjustable Output Circuit
Table 1. Component Suppliers
PHONE
Inductors
SUPPLIER
Marcon/United
Chemi-Con
(847) 696-2000
TDK
(847) 390-4373
Vishay/Vitramon
(203) 268-6261
(847) 390-4428
(203) 452-5670
Large-Value Ceramic Capacitors
(847) 696-9278
Motorola
(602) 303-5454
AVX
(803) 946-0690
Sanyo USA
(619) 661-6835
Sprague
(603) 224-1961
(619) 661-1055
(603) 224-1430
Electrolytic Capacitors
(803) 626-3123
Dale/Vishay
(402) 564-3131
IRC
(512) 992-7900
(402) 563-6418
(512) 992-3377
(602) 994-6430
Current-Sense Resistors
Sumida USA
(847) 956-0666
Central Semiconductor
(516) 435-1110
International Rectifier
(310) 322-3331
(516) 435-1824
(310) 322-3232
(847) 956-0702
MOSFETs and Diodes
Coiltronics
(561) 241-7876
Dale Inductors
(605) 668-4131
(561) 241-9339
(605) 665-1627
FAX
(847) 639-1469
Coilcraft
(847) 639-6400
相關(guān)PDF資料
PDF描述
DS21Q48 DATACOM, PCM TRANSCEIVER, PBGA144
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
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DS21Q50 制造商:MAXIM 制造商全稱:Maxim Integrated Products 功能描述:Quad E1 Transceiver
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DS21Q50L-C01 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述:
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