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參數(shù)資料
| 型號： | TPS62208DBV |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | DC/DC變換器 |
| 英文描述： | HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER |
| 中文描述： | 高效率，采用SOT23降壓，DC - DC變換器 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 280K |
| 代理商： | TPS62208DBV |
www.ti.com
APPLICATION INFORMATION
ADJUSTABLE OUTPUT VOLTAGE VERSION
When the adjustable output voltage version TPS62200 is used, the output voltage is set by the external resistor
divider. See Figure 16.
Vout
0.5 V
1
R1
R2
C1
1
2
10 kHz
R1
C2
R1
R2
C1
V
I
GND
EN
SW
FB
C3
4.7
μ
F
L1
10
μ
H
C4
10
μ
F
TPS62200
V
I
2.5 V 6 V
V
O
1.8 V / 300 mA
R1
470k
R2
180k
C1
33 pF
C2
100 pF
INDUCTOR SELECTION
The TPS6220x device is optimized to operate with a typical inductor value of 10 μH.
TPS62200, TPS62201
TPS62202, TPS62203, TPS62207
TPS62204, TPS62205, TPS62208
SLVS417D–MARCH 2002–REVISED MAY 2004
The output voltage is calculated as
R1 + R2 should not be greater than 1 M
for reasons of stability. To keep the operating quiescent current to a
minimum, the feedback resistor divider should have high impedance with R1+R2
≤
1 M
. Because of the high
impedance and the low reference voltage of V
ref
= 0.5 V, the noise on the feedback pin (FB) needs to be
minimized. Using a capacitive divider C1 and C2 across the feedback resistors minimizes the noise at the
feedback without degrading the line or load transient performance.
R1 + R2
≤
1 M
and internal reference voltage V(ref)typ = 0.5 V
C1 and C2 should be selected as
For C1 a value should be chosen that comes closest to the calculated result.
R1 = upper resistor of voltage divider
C1 = upper capacitor of voltage divider
For C2 the selected capacitor value should always be selected larger than the calculated result. For example, in
Figure 16 for C2, 100 pF are selected for a calculated result of C2 = 86.17 pF.
R2 = lower resistor of voltage divider
C2 = lower capacitor of voltage divider
If quiescent current is not a key design parameter, C1 and C2 can be omitted, and a low-impedance feedback
divider must be used with R1+R2 <100 k
. This design reduces the noise available on the feedback pin (FB) as
well, but increases the overall quiescent current during operation.
Figure 16. Typical Application Circuit for the Adjustable Output Voltage
For high efficiencies, the inductor should have a low dc resistance to minimize conduction losses. Although the
inductor core material has less effect on efficiency than its dc resistance, an appropriate inductor core material
must be used.
12
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS62200DBV | HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER |
| TPS62201DBV | HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER |
| TPS62202DBV | HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER |
| TPS62203DBV | HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER |
| TPS62204DBV | HIGH-EFFICIENCY, SOT23 STEP-DOWN, DC-DC CONVERTER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS62208DBVR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.875V Out Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62208DBVRG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.875V Out Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62208DBVT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.875V Out Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62208DBVTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.875V Out Hi-Eff Step-Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62220DDCR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 400mA Hi-Eff Step-Down Con 15uA RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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