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參數(shù)資料
| 型號： | TPS75418Q |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | FAST-TRANSIENT-RESPONSE 2-A LOW-DROPOUT VOLTAGE REGULATORS |
| 中文描述： | 快速瞬態(tài)響應2 -低壓差電壓調(diào)節(jié)器 |
| 文件頁數(shù)： | 17/29頁 |
| 文件大?。?/td> | 446K |
| 代理商： | TPS75418Q |
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TPS75201Q, TPS75215Q, TPS75218Q, TPS75225Q, TPS75233Q WITH RESET
TPS75401Q, TPS75415Q, TPS75418Q, TPS75425Q, TPS75433Q WITH POWER GOOD
FAST-TRANSIENT-RESPONSE 2-A LOW-DROPOUT VOLTAGE REGULATORS
SLVS242B – MARCH 2000 – REVISED JUNE 2003
17
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
APPLICATION INFORMATION
In most cases one can neglect the effect of inductive impedance ESL. Therefore, the following application
focuses mainly on the parasitic resistance ESR.
Figure 22 shows the output capacitor and its parasitic impedances in a typical LDO output stage.
LDO
V
I
V
ESR
I
O
R
ESR
C
O
R
LOAD
V
O
+
–
Figure 22. LDO Output Stage With Parasitic Resistances ESR and ESL
In steady state (dc state condition), the load current is supplied by the LDO (solid arrow) and the voltage across
the capacitor is the same as the output voltage (V(C
O
) = V
O
). This means no current is flowing into the C
O
branch. If I
O
suddenly increases (transient condition), the following occurs:
The LDO is not able to supply the sudden current need due to its response time (t
1
in Figure 24). Therefore,
capacitor C
O
provides the current for the new load condition (dashed arrow). C
O
now acts like a battery with
an internal resistance, ESR. Depending on the current demand at the output, a voltage drop will occur at
R
ESR
. This voltage is shown as V
ESR
in Figure 23.
When C
O
is conducting current to the load, initial voltage at the load will be V
O
= V(C
O
) – V
ESR
. Due to the
discharge of C
O
, the output voltage V
O
will drop continuously until the response time t
1
of the LDO is reached
and the LDO will resume supplying the load. From this point, the output voltage starts rising again until it
reaches the regulated voltage. This period is shown as t
2
in Figure 24.
The figure also shows the impact of different ESRs on the output voltage. The left brackets show different levels
of ESRs where number 1 displays the lowest and number 3 displays the highest ESR.
From above, the following conclusions can be drawn:
The higher the ESR, the larger the droop at the beginning of load transient.
The smaller the output capacitor, the faster the discharge time and the bigger the voltage droop during the
LDO response period.
相關PDF資料 |
PDF描述 |
|---|---|
| TPS75425Q | FAST-TRANSIENT-RESPONSE 2-A LOW-DROPOUT VOLTAGE REGULATORS |
| TPS75433Q | FAST-TRANSIENT-RESPONSE 2-A LOW-DROPOUT VOLTAGE REGULATORS |
| TPS75215Q | FAST-TRANSIENT-RESPONSE 2-A LOW-DROPOUT VOLTAGE REGULATORS |
| TPS75218Q | FAST-TRANSIENT-RESPONSE 2-A LOW-DROPOUT VOLTAGE REGULATORS |
| TPS75225Q | FAST-TRANSIENT-RESPONSE 2-A LOW-DROPOUT VOLTAGE REGULATORS |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS75418QPWP | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75418QPWPG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75418QPWPR | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75418QPWPRG4 | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
| TPS75425QPWP | 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 2-A RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動電壓（最大值）:307 mV 輸出電流:1 A 負載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:VQFN-20 |
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