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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)： | 3/23頁 |
| 文件大?。?/td> | 430K |
| 代理商： | C2012X5R1A225M |
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
3
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
detailed description
operating principle
The TPS60400, TPS60401 charge pumps invert the voltage applied to their input. For the highest performance,
use low equivalent series resistance (ESR) capacitors (e.g., ceramic). During the first half-cycle, switches S2
and S4 open, switches S1 and S3 close, and capacitor (C
(fly)
) charges to the voltage at V
I
. During the second
half-cycle, S1 and S3 open, S2 and S4 close. This connects the positive terminal of C
(fly)
to GND and the
negative to V
O.
By connecting C
(fly)
in parallel, C
O
is charged negative. The actual voltage at the output is more
positive than
–
V
I
, since switches S1
–
S4 have resistance and the load drains charge from C
O
.
C(fly)
1
μ
F
S2
S1
S3
S4
CO
1
μ
F
VO (
–
VI)
GND
VI
GND
Figure 1. Operating Principle
charge-pump output resistance
The TPS6040x devices are not voltage regulators. The charge pumps output source resistance is
approximately 15
at room temperature (with V
I
= 5 V), and V
O
approaches
–
5 V when lightly loaded. V
O
will
droop toward GND as load current increases.
V
O
=
–
(V
I
–
R
O
×
I
O
)
RO
1
osc
C(fly)
4 2RSWITCH
ESRCFLY
ESRCO
R
O
= output resistance of the converter
efficiency considerations
The power efficiency of a switched-capacitor voltage converter is affected by three factors: the internal losses
in the converter IC, the resistive losses of the capacitors, and the conversion losses during charge transfer
between the capacitors. The internal losses are associated with the IC
’
s internal functions, such as driving the
switches, oscillator, etc. These losses are affected by operating conditions such as input voltage, temperature,
and frequency. The next two losses are associated with the voltage converter circuit
’
s output resistance. Switch
losses occur because of the on-resistance of the MOSFET switches in the IC. Charge-pump capacitor losses
occur because of their ESR. The relationship between these losses and the output resistance is as follows:
P
CAPACITOR LOSSES
+ P
CONVERSION LOSSES
= I
O
2
×
R
O
R
SWITCH
= resistance of a single MOSFET-switch inside the converter
f
OSC
= oscillator frequency
The first term is the effective resistance from an ideal switched-capacitor circuit. Conversion losses occur during
the charge transfer between C
(fly)
and C
O
when there is a voltage difference between them. The power loss is:
P
CONV.LOSS
1
2
C
(fly)
V
2
I
V
2
O
1
O
V
2
RIPPLE
2V
O
V
RIPPLE
osc
(1)
(2)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 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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