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參數(shù)資料
| 型號： | ML4854IT |
| 廠商： | FAIRCHILD SEMICONDUCTOR CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect |
| 中文描述： | 0.5 A SWITCHING REGULATOR, 650 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | TSSOP-8 |
| 文件頁數(shù)： | 11/13頁 |
| 文件大小： | 133K |
| 代理商： | ML4854IT |
ML4854
PRODUCT SPECIFICATION
REV. 1.0.7 5/6/03
11
components. The PCB layout should be based on some
simple rules to minimize EMI and to ensure good regulation
performances:
1.
Place the IC, inductor, input and output capacitor as
close together as possible.
2.
Keep the output capacitor as close to the ML4854 as
possible with very short traces to V
OUT
and GND pins.
Typically it should be within 0.25 inches or 6 mm.
3.
Keep the traces for the power components wide,
typically > 50 mils or 1.25 mm.
4.
Place the external networks for LBI and FB close to
ML4854, but as far away as possible from the power
components to prevent voltage transient from coupling
into sensitive nodes.
5.
On multilayer boards, use component side copper for
grounding around the IC and connect back to a quiet
ground plane using vias. The ground planes act as
electrostatic shields for some of the RF energy radiated.
6.
The connection of the GND pin of the IC (pin 8) to the
overall grounding system should be directly to the
bottom of the output filter capacitor. A star grounding
system radiating from where the power enters the PCB,
is a recommended practice.
Application Example:
Using ML4854 as a constant current source to drive four LEDs:
The current through the LEDs is maintained constant within a large input voltage range as shown in the diagram below:
L
L = 10
μ
H
Cin = Cout = 10
μ
F
R = 62 ohm
D1...D4 = QTLP 600C-EB (blue)
D1
ML4854
1
2
3
4
8
7
6
5
R
D2
Cout
Cin
+
+
+
R
D3
R
D4
R
20
ML4854 feeds LED QTLP 600C-EB
Input Voltage (V)
L18.4
18.2
19.6
19.4
19.2
19
18.8
18.6
18
0
1
2
3
4
5
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| ML4854 | Adjustable, Low-Current, 2-Cell Boost Regulator with Shutdown and Low Battery Detect |
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| ML4863 | High Efficiency Flyback Controller(高效回轉(zhuǎn)電源控制器) |
| ML4865CS-2 | High Voltage High Current Boost Regulator |
| ML4865 | High Voltage High Current Boost Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| ML4854ITX | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| ML485-G | 功能描述:射頻混合器 1.6-3.2 GHz High IP3 Mixer w/ Int LO Amp RoHS:否 制造商:NXP Semiconductors 頻率范圍: 轉(zhuǎn)換損失——最大: 工作電源電壓:6 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| ML485-PCB | 功能描述:射頻開發(fā)工具 ML485 1.6-3.2GHz Eval Brd Active Mxr RoHS:否 制造商:Taiyo Yuden 產(chǎn)品:Wireless Modules 類型:Wireless Audio 工具用于評估:WYSAAVDX7 頻率: 工作電源電壓:3.4 V to 5.5 V |
| ML485TRG | 制造商:TriQuint Semiconductor 功能描述:RF MIXER |
| ML4861 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:Low Voltage Boost Regulator |
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