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參數(shù)資料
| 型號： | FAN5307 |
| 廠商： | Fairchild Semiconductor Corporation |
| 元件分類： | DC/DC變換器 |
| 英文描述： | High-Efficiency Step-Down DC-DC Converter |
| 中文描述： | 高效率降壓型DC - DC轉換器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 633K |
| 代理商： | FAN5307 |
FAN5307
PRODUCT SPECIFICATION
REV. 1.0.2 6/22/04
9
Application Information
Adjustable Output Voltage Version
The output voltage for the adjustable version is set by the
external resistor divider, as shown below:
and is calculated as:
To reduce noise sensitivity, R1 + R2 should not exceed
800k
.
Inductor Selection
The inductor parameters directly related to device perfor-
mances are saturation current and dc resistance. The
FAN5307 operates with a typical inductor value of 10μH.
The lower the dc resistance, the higher the efficiency. For
saturation current, the inductor should be rated higher than
the maximum load current plus half of the inductor ripple
current that is calculated as follows:
where:
f = Switching Frequency
L = Inductor Value
I
L
= Inductor Ripple Current
Input Capacitor Selection
For best performances, a low ESR input capacitor is
required. A ceramic capacitor of at least 4.7μF, placed as
close to the input pin of the device is recommended.
Output Capacitor Selection
The FAN5307’s switching frequency of 1MHz allows the
use of a low ESR ceramic capacitor with a value of 10μF to
22μF. This provides low output voltage ripple. In power save
mode the output voltage ripple is independent of the output
capacitor value and the ripple is determined by the internal
comparator thresholds. The typical output voltage ripple at
light load is 1% of the nominal output voltage.
PCB Layout Recommendations
The inherently high peak currents and switching frequency
of the power supplies require a careful PCB layout design.
Therefore, use wide traces for the high current path and
place the input capacitor, the inductor, and the output capaci-
tor as close as possible to the integrated circuit terminals. For
the adjustable version the resistor divider should be routed
away from the inductor to avoid electromagnetic interfer-
ence.
The 6-lead MLP version of the FAN5307 separates the high
current ground from the reference ground, therefore it is
more tolerant to the PCB layout design and shows better per-
formance.
Inductor
Value
10μH
Vendor
Part Number
Performance
Sumida
CDRH5D28-100
CDRH5D18-100
CDRH4D28-100
LQH66SN100M
01L
CDRH3D16-6R8
CDRH4D18-100
CR32-100
CR43-100
LQH4C100K04
High
Efficiency
Murata
6.8μH
10μH
Sumida
Smallest
Solution
Murata
Table 1: Recommended Inductors
10
μ
H
10μF
4.7
μ
F
F
1
3
4
5
2
V
IN
V
OUT
GND
EN
FB
L
X
C
R1
R2
4.7pF
V
OUT
0.5V
1
R
1
R
2
------
+
×
=
I
L
V
OUT
1
----------------L
V
V
IN
(
)
–
f
×
×
=
Capacitor
Value
4.7μF
10μF
Vendor
Part Number
Taiyo
Yuden
JMK212BY475MG
JMK212BJ106MG
JMK316BJ106KL
C12012X5ROJ106K
C3216X5ROJ106M
GRM32DR60J226K
TDK
22μF
Murata
Table 2: Recommended Capacitors
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| FAN5307MP | 制造商:Rochester Electronics LLC 功能描述: 制造商:Fairchild Semiconductor Corporation 功能描述: |
| FAN5307MP15X | 制造商:FAIRCHILD 制造商全稱:Fairchild Semiconductor 功能描述:High-Efficiency Step-Down DC-DC Converter |
| FAN5307MP18X | 功能描述:開關變換器、穩(wěn)壓器與控制器 Ang fg Stp DwnConvTR Adj OP UltraPortabl RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| FAN5307MPX | 功能描述:直流/直流開關轉換器 High-effic step-down DC/DC RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
| FAN5307S15X | 功能描述:開關變換器、穩(wěn)壓器與控制器 Ang fg Stp DwnConvTR Adj OP UltraPortabl RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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