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參數(shù)資料
| 型號： | EMK212BJ474MG |
| 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)： | 19/23頁 |
| 文件大?。?/td> | 430K |
| 代理商： | EMK212BJ474MG |
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
19
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
GaAs supply (continued)
R
PMAX
can be calculated using the following equation:
R
PMAX
V
CO
V
O
I
O
R
O
With: V
CO
=
–
3.3 V; V
O
=
–
2.7 V; I
O
=
–
3 mA
R
PMAX
= 200
–
52
= 148
A 100-
resistor was selected for R
P
.
The reference voltage across R2 is 1.24 V typical. With 5-
μ
A current for the voltage divider, R2 gets:
R2
1.24 V
5 A
250 k
R1
2.7
1.24 V
5 A
300 k
With C
P
= 1
μ
F the ratio V
O
/V
I
of the RC post filter is:
V
O
V
I
1
1
(2 125000Hz
100
1 F)
2
0.01
step-down charge pump
By exchanging GND with OUT (connecting the GND pin with OUT and the OUT pin with GND), a step-down
charge pump can easily be formed. In the first cycle S1 and S3 are closed, and C
(fly)
with C
O
in series are
charged. Assuming the same capacitance, the voltage across C
(fly)
and C
O
is split equally between the
capacitors. In the second cycle, S2 and S4 close and both capacitors with V
I
/2 across are connected in parallel.
C(fly)
+
1
μ
F
S2
S1
S3
S4
CO
1
μ
F
VO (VI/2)
GND
VI
VO (VI/2)
Figure 34. Step-Down Principle
TPS60400
OUT
C1+
IN
C1
–
GND
1
2
3
5
4
C(fly)
1
μ
F
CO
1
μ
F
CI
1
μ
F
VO (VI/2)
GND
VI
GND
Figure 35. Step-Down Charge Pump Connection
The maximum input voltage between V
I
and GND in the schematic (or between IN and OUT at the device itself)
must not exceed 6.5 V. For input voltages in the range of 6.5 V to 11 V, an additional Zener-diode is
recommended (see Figure 36).
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| EMK212BJ474MG-T | 制造商:TAIYO YUDEN 功能描述: |
| EMK212BJ475KDHT | 功能描述:多層陶瓷電容器MLCC - SMD/SMT CAP MLCC 0805 16V X5R 4.7uF 10% TOL 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 |
| EMK212BJ475KD-T | 功能描述:多層陶瓷電容器MLCC - SMD/SMT CAP MLCC 0805 16V X5R 4.7uF 10% 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 |
| EMK212BJ475KG-T | 功能描述:多層陶瓷電容器MLCC - SMD/SMT CAP MLCC 0805 16V X5R 4.7uF 10% 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 |
| EMK212BJ475KG-T | 制造商:TAIYO YUDEN 功能描述:Ceramic Multilayer Capacitor |
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