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參數(shù)資料
| 型號： | C2012X5R1A225M |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER |
| 中文描述： | 未穩(wěn)壓60 mA充電泵電壓型逆變器 |
| 文件頁數(shù)： | 4/23頁 |
| 文件大?。?/td> | 430K |
| 代理商： | C2012X5R1A225M |
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
4
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
efficiency considerations (continued)
The efficiency of the TPS6040x devices is dominated by their quiescent supply current at low output current and
by their output impedance at higher current.
I
O
I
O
I
Q
1
I
O
R
O
V
I
Where, I
Q
= quiescent current.
capacitor selection
To maintain the lowest output resistance, use capacitors with low ESR (see Table 1). The charge-pump output
resistance is a function of C
(fly)
’
s and C
O
’
s ESR. Therefore, minimizing the charge-pump capacitor
’
s ESR
minimizes the total output resistance. The capacitor values are closely linked to the required output current and
the output noise and ripple requirements. It is possible to only use 1-
μ
F capacitors of the same type.
input capacitor (C
I
)
Bypass the incoming supply to reduce its ac impedance and the impact of the TPS6040x switching noise. The
recommended bypassing depends on the circuit configuration and where the load is connected. When the
inverter is loaded from OUT to GND, current from the supply switches between 2 x I
O
and zero. Therefore, use
a large bypass capacitor (e.g., equal to the value of C
(fly)
) if the supply has high ac impedance. When the inverter
is loaded from IN to OUT, the circuit draws 2
×
I
O
constantly, except for short switching spikes. A 0.1-
μ
F bypass
capacitor is sufficient.
flying capacitor (C
(fly)
)
Increasing the flying capacitor
’
s size reduces the output resistance. Small values increases the output
resistance. Above a certain point, increasing C
(fly)
’
s capacitance has a negligible effect, because the output
resistance becomes dominated by the internal switch resistance and capacitor ESR.
output capacitor (C
O
)
Increasing the output capacitor
’
s size reduces the output ripple voltage. Decreasing its ESR reduces both output
resistance and ripple. Smaller 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.
VO(ripple)
IO
fosc
Co
2
IO
ESRCO
Table 1. Recommended Capacitor Values
DEVICE
VI
[V]
IO
[mA]
C
I
[
μ
F]
C(fly)
[
μ
F]
CO
[
μ
F]
TPS60400
1.8
…
5.5
1.8
…
5.5
1.8
…
5.5
1.8
…
5.5
60
1
1
1
TPS60401
60
10
10
10
TPS60402
60
3.3
3.3
3.3
TPS60403
60
1
1
1
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相關代理商/技術參數(shù) |
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|---|---|
| C2012X5R1A225M/0.80 | 功能描述:多層陶瓷電容器MLCC - SMD/SMT RoHS:否 制造商:American Technical Ceramics (ATC) 電容:10 pF 容差:1 % 電壓額定值:250 V 溫度系數(shù)/代碼:C0G (NP0) 外殼代碼 - in:0505 外殼代碼 - mm:1414 工作溫度范圍:- 55 C to + 125 C 產(chǎn)品:Low ESR MLCCs 封裝:Reel |
| C2012X5R1A225M/0.85 | 功能描述:多層陶瓷電容器MLCC - SMD/SMT 0805 2.2uF 10volts X5R 20%Thk 0.85mm RoHS:否 制造商:American Technical Ceramics (ATC) 電容:10 pF 容差:1 % 電壓額定值:250 V 溫度系數(shù)/代碼:C0G (NP0) 外殼代碼 - in:0505 外殼代碼 - mm:1414 工作溫度范圍:- 55 C to + 125 C 產(chǎn)品:Low ESR MLCCs 封裝:Reel |
| C2012X5R1A225M/1.25 | 功能描述:多層陶瓷電容器MLCC - SMD/SMT 2.2uF 20% 10Volts RoHS:否 制造商:American Technical Ceramics (ATC) 電容:10 pF 容差:1 % 電壓額定值:250 V 溫度系數(shù)/代碼:C0G (NP0) 外殼代碼 - in:0505 外殼代碼 - mm:1414 工作溫度范圍:- 55 C to + 125 C 產(chǎn)品:Low ESR MLCCs 封裝:Reel |
| C2012X5R1A225M/10 | 制造商:TDK CORPORATION OF AMERICA 功能描述:MLCC |
| C2012X5R1A225M085AA | 制造商:TDK 功能描述:CAP 2.2UF 10VDC X5R 20% SMD 0805 - Tape and Reel 制造商:TDK 功能描述:CAP CER 2.2UF 10V 20% X5R 0805 制造商:TDK 功能描述:CAPACITOR CERAMIC, 2.2UF, 10V, X5R, 20%, 0805; Capacitance:2.2F; Capacitance Tolerance: 20%; Dielectric Characteristic:X5R; Voltage Rating:10V; Capacitor Case Style:0805 [2012 Metric]; Capacitor Terminals:SMD; No. of Pins:2 ;RoHS Compliant: Yes 制造商:TDK CORPORATION OF AMERICA 功能描述:Case:C2012, T.C:X5R, Voltage:1A, Cap Value:225, Tol:M, Thickness:0.85, E series: 3 |
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