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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 |
| 文件頁數(shù)： | 14/18頁 |
| 文件大?。?/td> | 425K |
| 代理商： | TPS62020DRC |
www.ti.com
VO
VO
1–
VO
VI
L
1
8
CO
ESR
(9)
Input Capacitor Selection
Because of the nature of the buck converter having a pulsating input current, a low ESR input capacitor is
required for best input voltage filtering and minimizing the interference with other circuits caused by high input
voltage spikes. The input capacitor should have a minimum value of 10 μF for the TPS62020. The input
capacitor can be increased without any limit for better input voltage filtering.
Layout Considerations
For all switching power supplies, the layout is an important step in the design especially at high peak currents
and switching frequencies. If the layout is not carefully done, the regulator might show stability problems as well
as EMI problems. Therefore, use wide and short traces for the main current paths as indicated in bold in
Figure 16. These traces should be routed first. The input capacitor should be placed as close as possible to the
IC pins as well as the inductor and output capacitor. The feedback resistor network should be routed away from
the inductor and switch node to minimize noise and magnetic interference. To further minimize noise from
coupling into the feedback network and feedback pin, the ground plane or ground traces should be used for
shielding. A common ground plane or a star ground as shown below should be used. This becomes very
important especially at high switching frequencies of 1.25 MHz.
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
L1
6.2
μ
H
C2
22
μ
F
V
O
The Switch Node Must Be
Kept as Small as Possible
TPS62020, TPS62021
SLVS076B–JUNE 2003–REVISED APRIL 2004
Where the highest output voltage ripple occurs at the highest input voltage, V
I
.
At light load currents, the device operates in power save mode and the output voltage ripple is independent of
the output capacitor value. The output voltage ripple is set by the internal comparator thresholds. The typical
output voltage ripple is 1% of the nominal output voltage.
Table 2. Input and Output Capacitor Selection
CAPACITOR
VALUE
CASE SIZE
COMPONENT SUPPLIER
COMMENTS
Taiyo Yuden JMK212BJ106MG
TDK C12012X5ROJ106K
Taiyo Yuden JMK316BJ106KL
TDK C3216X5ROJ106M
Taiyo Yuden JMK316BJ226ML
Taiyo Yuden JMK325BJ226MM
Ceramic
Ceramic
10 μF
0805
10 μF
1206
Ceramic
22 μF
22 μF
1206
1210
Ceramic
Ceramic
Figure 16. Layout Diagram
14
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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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