參數(shù)資料
型號(hào)： TPS75125Q
廠商： Texas Instruments, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： FAST-TRANSIENT-RESPONSE 1.5-A LOW-DROPOUT VOLTAGE REGULATORS(快速瞬間響應(yīng)，1.5A低壓差穩(wěn)壓器)
中文描述： 快速瞬態(tài)響應(yīng)1.5低壓差穩(wěn)壓器（快速瞬間響應(yīng)，1.5A的低壓差穩(wěn)壓器）
文件頁(yè)數(shù)： 17/27頁(yè)
文件大小： 431K
代理商： TPS75125Q
TPS75101Q, TPS75115Q, TPS75118Q, TPS75125Q, TPS75133Q WITH POWER GOOD
TPS75301Q, TPS75315Q, TPS75318Q, TPS75325Q, TPS75333Q WITH RESET
FAST-TRANSIENT-RESPONSE 1.5-A LOW-DROPOUT VOLTAGE REGULATORS
SLVS241B
–
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 23). 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 22.
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 23.
Figure 23 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.
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS75125QPWP 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75125QPWPG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75125QPWPR 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75125QPWPRG4 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
TPS75133QPWP 功能描述:低壓差穩(wěn)壓器 - LDO Fast-Tran-Resp 1.5-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(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)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(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
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