參數(shù)資料
型號(hào)： LTC4268IDKD-1#PBF
廠商： Linear Technology
文件頁(yè)數(shù)： 40/46頁(yè)
文件大小： 419K
描述： IC PD HIGH POWER W/CNTRL 32-DFN
產(chǎn)品培訓(xùn)模塊： Power over Ethernet
標(biāo)準(zhǔn)包裝： 52
類(lèi)型： 以太網(wǎng)供電開(kāi)關(guān)（PoE）
應(yīng)用： 遠(yuǎn)程外設(shè)（工業(yè)控制，相機(jī)，數(shù)據(jù)訪問(wèn)）
內(nèi)部開(kāi)關(guān)： 是
工作溫度： -40°C ~ 85°C
安裝類(lèi)型： 表面貼裝
封裝/外殼： 32-WFDFN 裸露焊盤(pán)
供應(yīng)商設(shè)備封裝： 32-DFN（7x4）裸露焊盤(pán)
包裝： 管件
LTC4268-1
40
42681fc
The output capacitor should have an RMS current rating
greater than:
 
I
RMS(SEC)
=I
OUT
DC
MAX
1DC
MAX
Continuing the example:
I
RMS(SEC)
=5.3A
49.4%
1 49.4%
=5.24A
This is calculated for each output in a multiple winding
application.
ESR and ESL along with bulk capacitance directly affect the
output voltage ripple. The waveforms for a typical flyback
converter are illustrated in Figure 19.
The maximum acceptable ripple voltage (expressed as a
percentage of the output voltage) is used to establish a
starting point for the capacitor values. For the purpose
of simplicity we will choose 2% for the maximum output
ripple, divided equally between the ESR step and the
charging/discharging DV. This percentage ripple changes,
depending on the requirements of the application. You
can modify the equations below. For a 1% contribution
applicaTions inForMaTion
to the total ripple voltage, the ESR of the output capacitor
is determined by:
 
ESR
COUT
d1%
V
OUT
1DC
MAX
(
)
I
OUT
The other 1% is due to the bulk C component, so use:
 
C
OUT
e
I
OUT
1%  V
OUT
f
OSC
In many applications the output capacitor is created from
multiple capacitors to achieve desired voltage ripple,
reliability and cost goals. For example, a low ESR ceramic
capacitor can minimize the ESR step, while an electrolytic
capacitor satisfies the required bulk C.
Continuing our example, the output capacitor needs:
 
ESR
COUT
d1%
5V   1 49.4%
(
)
5.3A
= 4mW
C
OUT
e
5.3A
1
2   kHz
=600礔
These electrical characteristics require paralleling several
low ESR capacitors possibly of mixed type.
OUTPUT VOLTAGE
RIPPLE WAVEFORM
SECONDARY
CURRENT
PRIMARY
CURRENT
I
PRI
V
COUT
42681 F19
RINGING
DUE TO ESL
I
PRI
N
V
ESR
Figure 19. Typical Flyback Converter Waveforms
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC4268IDKD-1-TR 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Power PD with Synchronous NoOpto Flyback Controller
LTC4268IDKD-1-TRPBF 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:High Power PD with Synchronous NoOpto Flyback Controller
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LTC4269-2 制造商:LINER 制造商全稱(chēng):Linear Technology 功能描述:IEEE 802.3at High Power PD and Synchronous Forward Controller with AUX Support
LTC4269CDKD-1#PBF 功能描述:IC PD/OPTO FLYBACK CTRLR 32-DFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 熱交換 系列:- 標(biāo)準(zhǔn)包裝:50 系列:- 類(lèi)型:熱交換控制器 應(yīng)用:-48V 遠(yuǎn)程電力系統(tǒng)，AdvancedTCA ? 系統(tǒng)，高可用性 內(nèi)部開(kāi)關(guān):無(wú) 電流限制:可調(diào) 電源電壓:11.5 V ~ 14.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應(yīng)商設(shè)備封裝:10-MSOP 包裝:管件
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