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參數資料
| 型號： | NCP1729 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Switched Capacitor Voltage Inverter |
| 中文描述： | 開關電容電壓逆變器 |
| 文件頁數： | 5/22頁 |
| 文件大小： | 165K |
| 代理商： | NCP1729 |
NCP1729
http://onsemi.com
5
6
4
2
3
1
OSC
V
out
C
1
C
2
+
R
L
+
+C
3
V
in
Figure 14. Test Setup/Voltage Inverter
5
C
1
= C
2
= C
3
= 3.3 F
DETAILED OPERATING DESCRIPTION
The NCP1729 charge pump converter inverts the voltage
applied to the V
in
pin. Conversion consists of a twophase
operation (Figure 15). During the first phase, switches S
2
and S
4
are open and S
1
and S
3
are closed. During this time,
C
1
charges to the voltage on V
in
and load current is supplied
from C
2
. During the second phase, S
2
and S
4
are closed, and
S
1
and S
3
are open. This action connects C
1
across C
2
,
restoring charge to C
2
.
Figure 15. Ideal Switched Capacitor Charge Pump
S3
S4
C
2
C
1
S1
S2
V
in
V
out
From OSC
APPLICATIONS INFORMATION
Output Voltage Considerations
The NCP1729 performs voltage conversion but does not
provide regulation. The output voltage will drop in a linear
manner with respect to load current. The value of this
equivalent output resistance is approximately 26 nominal
at 25
°
C with V
in
= 5.0 V. V
out
is approximately 5.0 V at
light loads, and drops according to the equation below:
VDROP
Iout
Rout
Vout
(Vin
VDROP)
Charge Pump Efficiency
The overall power conversion efficiency of the charge
pump is affected by four factors:
1. Losses from power consumed by the internal
oscillator, switch drive, etc. (which vary with input
voltage, temperature and oscillator frequency).
2. I
2
R losses due to the onresistance of the MOSFET
switches onboard the charge pump.
3. Charge pump capacitor losses due to
Equivalent Series Resistance (ESR).
4. Losses that occur during charge transfer from the
commutation capacitor to the output capacitor when
a voltage difference between the two capacitors
exists.
Most of the conversion losses are due to factors 2, 3 and 4.
These losses are given by Equation 1.
PLOSS(2,3,4)
Iout
2
Rout
Iout
2
1
(fOSC)C1
8RSWITCH
4ESRC1
ESRC2
(eq. 1)
The 1/(f
OSC
)(C
1
) term in Equation 1 is the effective output
resistance of an ideal switched capacitor circuit (Figures 16
and 17).
The losses due to charge transfer above are also shown in
Equation 2. The output voltage ripple is given by Equation 3.
0.5C2(VRIPPLE
2
2VoutVRIPPLE)]
fOSC
PLOSS
[ 0.5C1(Vin
2
Vout
2
)
(eq. 2)
VRIPPLE
Iout
(fOSC)(C2)
2(Iout)(ESRC2)
(eq. 3)
R
L
C
2
C
1
V
in
V
out
f
Figure 16. Ideal Switched Capacitor Model
R
L
C
2
V
in
V
out
R
EQUIV
REQUIV
1
f
C1
Figure 17. Equivalent Output Resistance
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1729-SKT | 制造商:P&S 功能描述:Sample Kit, including Two NCP1729SN35T1 and A Development Source CD-ROM 制造商:P&S 功能描述:Sample Kit,including Two NCP1729SN35T1 and A Development Source CD-ROM |
| 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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