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參數(shù)資料
| 型號： | G5930TBU |
| 廠商： | Global Mixed-mode Technology Inc. |
| 元件分類： | 開關(guān)電容變換 |
| 英文描述： | Switched Capacitor Voltage Inverter with Shutdown |
| 中文描述： | 開關(guān)電容電壓逆變器，帶有關(guān)斷 |
| 文件頁數(shù)： | 7/8頁 |
| 文件大小： | 319K |
| 代理商： | G5930TBU |
Ver: 1.0
Sep 09, 2005
TEL: 886-3-5788833
http://www.gmt.com.tw
7
G5930
Global Mixed-mode Technology Inc.
Application Information
Table 1. Low-ESR Capacitor Manufacturers
PRODUCTION
METHOD
MANUFACTURER
SERIES
AVX
X7R
Surface-Mount
Ceramic
Matsuo
X7R
Capacitor Selection
To maintain the lowest output resistance, use capaci-
tors with low ESR (Table 1). The charge-pump output
resistance is a function of C1’s and C2’s ESR. There-
fore, minimizing the charge-pump capacitor’s ESR
minimizes the total output resistance.
Flying Capacitor (C1)
Increasing the flying capacitor’s value reduces the
output resistance. Above a certain point, increasing
C1’s capacitance has a negligible effect because the
output resistance becomes dominated by the internal
switch resistance and capacitor ESR.
Output Capacitor (C2)
Increasing the output capacitor’s value reduces the
output ripple voltage. Decreasing its ESR reduces
both output resistance and ripple. Lower capacitance
values can be used with light loads if higher output
ripple can be tolerated. Use the following equation to
calculate the peak-to-peak ripple:
2
C
L
OSC
L
RIPPLE
ESR
xI
2
xC
f
I
V
+
=
The output resistance is dependent on the capaci-
tance and ESR values of the external capacitors. The
output voltage drop is the load current times the output
resistance, and the power efficiency is
)
V
(
I
R
I
R
I
R
I
P
IN
Q
OUT
2
L
2
L
IN
OUT
2
+
=
η
Where IQ(VIN) is the quiescent power loss of the IC
device,and IL
2R
out is the conversion loss associated
with the switch on-resistance, the two external capaci-
tors and their ESRs.
Input Bypass Capacitor (C3)
Bypass the incoming supply to reduce its AC imped-
ance and the impact of the G5930’s switching noise. A
bypass capacitor with a value equal to that of C1 is
recommended.
Voltage Inverter
The most common application for these devices is a
charge-pump voltage inverter (Figure 2). This applica-
tion requires only two external components— capaci-
tors C1 and C2—plus a bypass capacitor, if neces-
sary.
Layout and Grounding
Good layout is important, primarily for good noise per-
formance. To ensure good layout, mount all compo-
nents as close together as possible, keep traces short
to minimize parasitic inductance and capacitance, and
use a ground plane.
Figure 2. Typical Application Circuit
+
C1+
C1-
63
C1
1F
2
IN
+
C2
1F
NEGATIVE
OUTPUT
-1 x V
IN
R
L
OUT
1
4
GND
SHDN
ON
OFF
C3
1F
5
G5930
+
C1+
C1-
63
C1
1F
2
IN
+
C2
1F
NEGATIVE
OUTPUT
-1 x V
IN
R
L
OUT
1
4
GND
SHDN
ON
OFF
C3
1F
5
G5930
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