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参数资料
| 型号： | G5107TBU |
| 厂商： | Global Mixed-mode Technology Inc. |
| 元件分类： | DC/DC变换器 |
| 英文描述： | Low-Voltage, High-Efficiency, Step-up DC-DC Converter |
| 中文描述： | 低电压，高效率，升压型DC - DC转换器 |
| 文件页数： | 9/10页 |
| 文件大小： | 421K |
| 代理商： | G5107TBU |
Ver: 0.3 Preliminary
May 11, 2006
TEL: 886-3-5788833
http://www.gmt.com.tw
8
G5107
Global Mixed-mode Technology Inc.
Function Description
Normal Operation
The G5107 uses a constant frequency control scheme
to provide excellent line and load regulation. Operation
can be best understood by referring to the block dia-
gram. At the start of each oscillator cycle, the SR latch
is set, which turns on the power switch M1. An artificial
ramp is generated to the positive terminal of the PWM
comparator A2. When this voltage exceeds the level at
the negative input of A2, the SR latch is reset turning
off the power switch. The level at the negative input of
A2 is set by the error amplifier A1, and is simply an
amplified version of the difference between the feed-
back voltage and the reference voltage of 1.28V. In
this manner, the error amplifier sets the correct peak
current level (DCM) or duty (CCM) to keep the output
in regulation.
Over Voltage Protection
Over voltage protect function is designed to prevent
the output accidentally damage the load. Once the
device detects over voltage (nominalx1.05) at the
output, the internal NMOS switch turned off to stop
power input.
Application Information
Inductor Selection
A 2.2H~10H inductor is recommended for small
ripple applications. Small form factor and high effi-
ciency are the major concerns for most G5107 appli-
cations. Inductor with low core losses and small DCR
(cooper wire resistance) at 1MHz are good choice for
G5107 applications.
Capacitor Selection
Various types of output capacitor are suitable for
G5107. To obtain small output ripple, the small size of
ceramic capacitors are suitable for G5107 applications.
X5R and X7R types are recommended because they
retain their capacitance over wider voltage and tem-
perature ranges than other types such as Y5V or Z5U.
A 4.7F~22F output capacitor is enough for most
applications.
To using a low cost Tantalum/Electrolytic type capaci-
tors, a 47F~100F output capacitor is enough. An-
other small 1F ceramic is recommended to place near
G5107 VCC pin to bypass high frequency noise gener-
ated from the higher ESR output capacitor.
Diode Selection
Schottky diodes, with their low forward voltage drop
and fast reverse recovery, are the ideal choices for
G5107 applications. The forward voltage drop of a
Schottky diode represents the conduction losses in the
diode, while the diode capacitance (CT or CD) repre-
sents the switching losses. For diode selection, both
forward voltage drop and diode capacitance need to
be considered. Schottky diodes with higher current
ratings usually have lower forward voltage drop and
larger diode capacitance, which can cause significant
switching losses at the 1MHz switching frequency of
the G5107. A Schottky diode rated at 2A is sufficient
for most G5107 applications.
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