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參數(shù)資料
| 型號： | G5111 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Micro-power Step-Up DC/DC Converters in SOT23-5 |
| 中文描述： | 微功率升壓型DC / DC轉(zhuǎn)換器采用SOT23 - 5 |
| 文件頁數(shù)： | 4/5頁 |
| 文件大小： | 89K |
| 代理商： | G5111 |
Ver 0.2 Preliminary
Jan 09, 2002
TEL: 886-3-5788833
http://www.gmt.com.tw
4
G5111
Global Mixed-mode Technology Inc.
Capacitor Selection
Low ESR (Equivalent Series Resistance) capacitors
should be used at the output to minimize the output
ripple voltage and the peak-to-peak transient voltage.
Multilayer ceramic capacitors (MLCC) are the best
choice, as they have a very low ESR and are available
in very small packages. Their small size makes them a
good match with the G5111’s SOT-23 package. If
solid tantalum capacitors (like the AVX TPS, Sprague
593D families) or OS-CON capacitors are used, they
will occupy more volume than a ceramic ones and the
higher ESR increases the output ripple voltage. Notice
that use a capacitor with a sufficient voltage rating.
A low ESR surface-mount ceramic capacitors also
make a good selection for the input bypass capacitor,
which should be placed as close as possible to the
G5111. A 4.7μF input capacitor is sufficient for most
applications.
Diode Selection
For most G5111 applications, the high switching fre-
quency requires a high-speed rectifier Schottky diodes,
such as the Motorola MBR0520 (0.5A, 20V) with their
low forward voltage drop and fast switching speed, are
Typical Applications
Boost Converter
recommended. Many different manufacturers make
equivalent parts, but make sure that the component is
rated to operate at least 0.35A. To achieve high effi-
ciency, the average current rating of the Schottky di-
odes should be greater than the peak switching cur-
rent. Choose a reverse breakdown voltage greater
than the output voltage.
Lowering Output Voltage Ripple
The G5111 supplies energy to the load in bursts by
ramping up the inductor current, then delivering that
current to the load. To use low ESR capacitors will
help minimize the output ripple voltage, but proper
selection of the inductor and the output capacitor also
plays a big role. If a larger inductance value or a
smaller capacitance value is used, the output ripple
voltage will increase because the capacitor will be
slightly overcharged each burst cycle. To reduce the
output ripple, increase the output capacitance value or
add a 10pF feed-forward capacitor in the feedback
network of the G5111 (see the circuits in the Typical
Applications section). To add this small, inexpensive
10pF capacitor will greatly reduce the output voltage
ripple.
SEPIC Converter
VCC
SW
SHDN
FB
GND
G5111
10pF
22μF
4.7μF
L1
4.7μH
120k
V
IN
2.5V to 4.2V
390k
50mA
2
4
5
1
3
D1
L1
10μH
VCC
SW
SHDN
FB
GND
G5111
10pF
22μF
4.7μF
270k
V
IN
2.5V to 4.2V
470k
60mA
2
4
5
1
3
1μF
D1:MOTOROLA MBR0520
(800) 441-2447
D1:MOTOROLA MBR0520
(800) 441-2447
10μH
D1
C2
C1
R2
R1
5V
C2
C1
R2
R1
3.3V
C3
L1:MURATA LQH3C4R7M24
(814) 237-1431
L1,L2:MURATA LQH3C100K24
(814) 237-1431
L2
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| G611B | Tantalum Molded Capacitor; Capacitance: 220uF; Voltage: 2.5V; Packaging: Tape & Reel |
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| G618B | Tantalum Molded Capacitor; Capacitance: 33uF; Voltage: 4V; Case Size: 1.6x3.2 mm; Packaging: Tape & Reel |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| G5111_04 | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Micro-power Step-Up DC/DC Converters in SOT-23-5 |
| G5111T11U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Micro-power Step-Up DC/DC Converters in SOT-23-5 |
| G5111T11UF | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Micro-power Step-Up DC/DC Converters in SOT-23-5 |
| G5111T12U | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Micro-power Step-Up DC/DC Converters in SOT-23-5 |
| G5111T12UF | 制造商:GMT 制造商全稱:Global Mixed-mode Technology Inc 功能描述:Micro-power Step-Up DC/DC Converters in SOT-23-5 |
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