參數(shù)資料
型號(hào)： TPS62020DRC
廠商： Texas Instruments, Inc.
英文描述： 600 mA/1.25 MHz HIGH-EFFICIENCY STEP-DOWN CONVERTER
中文描述： 600 mA/1.25兆赫高效降壓型轉(zhuǎn)換器
文件頁(yè)數(shù)： 12/18頁(yè)
文件大?。?/td> 425K
代理商： TPS62020DRC
www.ti.com
APPLICATION INFORMATION
ADJUSTABLE OUTPUT VOLTAGE VERSION
When the adjustable output voltage version TPS62020 is used, the output voltage is set by the external resistor
divider. See Figure 15.
VO
0.5 V
1
R1
R2
(3)
C1
1
2
10 kHz
R1
(4)
C2
R1
R2
C1
(5)
VIN
VIN
EN
MODE
GND
SW
SW
FB
PGND
PGND
2
3
1
6
4
9
10
5
7
8
TPS62020
C3
22
μ
F
V
I
2.5 V to 6 V
L1
6.2
μ
H
C4
22
μ
F
V
O
1.8 V / 600 mA
R1
470 k
R2
180 k
C1
33 pF
C2
100 pF
TPS62020, TPS62021
SLVS076B–JUNE 2003–REVISED APRIL 2004
The output voltage is calculated as:
with R1 + R2
≤
1 M
and internal reference voltage V
ref
typical = 0.5 V
R1 + R2 should not be greater than 1 M
because of stability reasons. To keep the operating quiescent current
to a minimum, the feedback resistor divider should have high impedance with R1+R2
≤
1 M
. Due to this 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.
C1 and C2 should be selected as:
with:
R1 = upper resistor of voltage divider
C1 = upper capacitor of voltage divider
For C1 a value should be chosen that comes closest to the calculated result.
with:
R2 = lower resistor of voltage divider
C2 = lower capacitor of voltage divider
For C2, the selected capacitor value should always be selected larger than the calculated result. For example, in
Figure 15 for C2 100 pF are selected for a calculated result of C2 = 88.42 pF.
If quiescent current is not a key design parameter C1 and C2 can be omitted, and a low impedance feedback
divider has to be used with R1 + R2 < 100 k
. This reduces the noise available on the feedback pin (FB) as well
but increases the overall quiescent current during operation. The higher the programmed output voltage the
lower the feedback impedance has to be for best operation when not using C1 and C2.
Figure 15. Adjustable Output Voltage Version
12
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TPS62020DRCR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA Hi-Eff Step-Down 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
TPS62020DRCRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA Hi-Eff Step-Down 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
TPS62020EVM-019 功能描述:電源管理IC開發(fā)工具 TPS62020-019 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評(píng)估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V
TPS62021DGQR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA 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
TPS62021DGQRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 Adj 600mA 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
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