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参数资料
| 型号： | FAN4855MTCX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BST SYNC ADJ 0.5A 8TSSOP |
| 产品变化通告： | Product Discontinuation 03/Dec/2009 |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 3 V ~ 5 V |
| 输入电压： | 1.6 V ~ 4.5 V |
| 电流 - 输出： | 500mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP（0.173"，4.40mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-TSSOP |
Layout and Grounding Considerations
Careful design of printed circuit board is recommended
since high frequency switching and high peak currents
are present in DC/DC converters applications. A general
rule is to place the converter circuitry well away from any
sensitive analog components. The printed circuit board
Application Example
The FAN4855 can be used as a constant current source
to drive white LEDs like QTLP670C-IW. As shown in the
diagram below, the current is maintained constant over a
wide range of input voltages.
layout should be based on some simple rules to minimize
EMI and to ensure good regulation performances:
L = 10μH
D1
62 ?
1.
Place the IC, inductor, input and output capacitor as
close together as possible.
1
2
3
FAN4855
8
7
6
D2
62 ?
2.
Keep the output capacitor as close to the FAN4855
4
5
as possible with very short traces to V OUT and GND
pins. Typically it should be within 0.25 inches or 6
mm.
+
Cin
10μF
+
+
Cout
10μF
D3
62 ?
3.
4.
Keep the traces for the power components wide,
typically > 50 mils or 1.25 mm.
Place the external networks for LBI and FB close to
D4
62 ?
FAN4855, but away from the power components as
far as possible to prevent voltage transient from cou-
pling into sensitive nodes.
20
19.8
5.
6.
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
electromagnetic shields for some of the RF energy
radiated.
The connection of the GND pin of the IC (pin 8) to
19.6
19.4
19.2
19
18.8
18.6
18.4
18.2
the overall grounding system should be directly to
the bottom of the output ?lter capacitor. A star
grounding system radiating from where the power
18
0
1
2 3
Input Voltage (V)
4
5
enters the PCB, is a recommended practice.
FAN4855 Rev. 1.0.1
10
www.fairchildsemi.com
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相关代理商/技术参数 |
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|---|---|
| FAN4855MTCX | 制造商:Fairchild Semiconductor Corporation 功能描述:DC/DC Converter IC |
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| FAN4855MUX | 制造商:FAIRCHILD 制造商全称:Fairchild Semiconductor 功能描述:500mA High Efficiency Boost Regulator with Adjustable Output, Shutdown and Low Battery Detect |
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