- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄384297 > EMK212BJ474MG (Texas Instruments, Inc.) UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER PDF資料下載
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)： | 4/23頁 |
| 文件大?。?/td> | 430K |
| 代理商： | EMK212BJ474MG |
TPS60400, TPS60401, TPS60402, TPS60403
UNREGULATED 60-mA CHARGE PUMP VOLTAGE INVERTER
SLVS324
–
JULY 2001
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
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| EML17 | General purpose transistor |
| EMT1 | General Purpose Transistor (Isolated Dual Transistors) |
| EMT3 | TERMINAL |
| EMT2 | TERMINAL |
| EMT5 | Emitter common (dual transistors) |
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 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。