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參數(shù)資料
| 型號(hào)： | NCP1729 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Switched Capacitor Voltage Inverter |
| 中文描述： | 開關(guān)電容電壓逆變器 |
| 文件頁數(shù)： | 6/22頁 |
| 文件大?。?/td> | 165K |
| 代理商： | NCP1729 |
NCP1729
http://onsemi.com
6
Capacitor Selection
In order to maintain the lowest output resistance and
output ripple voltage, it is recommended that low ESR
capacitors be used. Additionally, larger values of C
1
will
lower the output resistance and larger values of C
2
will
reduce output voltage ripple. (See Equation 3).
Table 1 shows various values of C
1
, C
2
and C
3
with the
corresponding output resistance values at 25
°
C. Table 2
shows the output voltage ripple for various values of C
1
, C
2
and C
3
. The data in Tables 1 and 2 was measured not
calculated.
Table 1. Output Resistance vs. Capacitance
(C
1
= C
2
= C
3
), V
in
= 4.75 V and V
out
= 4.0 V
C
1
= C
2
= C
3
( F)
R
out
( )
0.68
55.4
1.3
36.9
3.3
26.0
7.3
25.8
10
25.5
24
25.0
50
24.0
Table 2. Output Voltage Ripple vs. Capacitance
(C
1
= C
2
= C
3
), V
in
= 4.75 V and V
out
= 4.0 V
C
1
= C
2
= C
3
( F)
Output Voltage Ripple
(mV)
0.68
322
1.3
205
3.3
120
7.3
69
10
56
24
32
50
20
Input Supply Bypassing
The input voltage, V
in
should be capacitively bypassed to
reduce AC impedance and minimize noise effects due to the
switching internals in the device. If the device is loaded from
V
out
to GND, it is recommended that a large value capacitor
(at least equal to C
1
) be connected from V
in
to GND. If the
device is loaded from V
in
to V
out
, a small (0.7 F) capacitor
between the pins is sufficient.
Voltage Inverter
The most common application for a charge pump is the
voltage inverter (Figure 14). This application uses two or
three external capacitors. The C
1
(pump capacitor) and C
2
(output capacitor) are required. The input bypass capacitor
C
3
, may be necessary depending on the application. The
output is equal to V
in
plus any voltage drops due to loading.
Refer to Tables 1 and 2 for capacitor selection. The test setup
used for the majority of the characterization is shown in
Figure 14.
Layout Considerations
As with any switching power supply circuit, good layout
practice is recommended. Mount components as close
together as possible to minimize stray inductance and
capacitance. Also use a large ground plane to minimize
noise leakage into other circuitry.
Capacitor Resources
Selecting the proper type of capacitor can reduce
switching loss. Low ESR capacitors are recommended. The
NCP1729 was characterized using the capacitors listed in
Table 3. This list identifies low ESR capacitors for the
voltage inverter application.
Table 3. Capacitor Types
Manufacturer/Contact
Part Types/Series
AVX
8434489411
www.avxcorp.com
TPS
Cornell Dubilier
5089968561
www.cornelldubilier.com
ESRD
ll d bili
Sanyo/Oscon
6196616835
www.sanyovideo.com/oscon.htm
SN
SVP
Vishay
6032241961
i h
www.vishay.com
593D
594
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| NCP1729SN35T1 | 功能描述:電荷泵 Switched Cap Voltage RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| NCP1729SN35T1G | 功能描述:電荷泵 Switched Cap Voltage Inverter w/Shutdown RoHS:否 制造商:Maxim Integrated 功能:Inverting, Step Up 輸出電壓:- 1.5 V to - 5.5 V, 3 V to 11 V 輸出電流:100 mA 電源電流:1 mA 最大工作溫度:+ 70 C 封裝 / 箱體:SOIC-8 Narrow 封裝:Tube |
| NCP1729SN35T1G | 制造商:ON Semiconductor 功能描述:Power Supply IC |
| NCP1800DM41R2 | 功能描述:電池管理 4.1V Single Cell RoHS:否 制造商:Texas Instruments 電池類型:Li-Ion 輸出電壓:5 V 輸出電流:4.5 A 工作電源電壓:3.9 V to 17 V 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:VQFN-24 封裝:Reel |
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