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參數(shù)資料
| 型號： | TPS62229DDCT |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23 |
| 中文描述： | 400毫安，1.25 MHz的，高效率，降壓型轉(zhuǎn)換器薄，SOT23封裝 |
| 文件頁數(shù)： | 14/24頁 |
| 文件大小： | 709K |
| 代理商： | TPS62229DDCT |
www.ti.com
C2
1
2
P
R2
1
2
8 kHz
R2
V
I
GND
EN
SW
FB
C3
4.7
μ
F
L1
4.7
μ
H
C4
10
μ
F
TPS62220
V
I
2.5 V 6 V
V
O
1.8 V / 400 mA
R1
470k
R2
180k
C1
15 pF
C2
100 pF
INDUCTOR SELECTION
For high efficiencies, the inductor should have a low dc resistance to minimize conduction losses. Especially at
high-switching frequencies the core material has a higher impact on efficiency. When using small chip inductors,
the efficiency is reduced mainly due to higher inductor core losses. This needs to be considered when selecting
the appropriate inductor. The inductor value determines the inductor ripple current. The larger the inductor value,
the smaller the inductor ripple current and the lower the conduction losses of the converter. Conversely, larger
inductor values cause a slower load transient response. To avoid saturation of the inductor, the inductor should
be rated at least for the maximum output current of the converter plus the inductor ripple current that is
calculated as:
D
I
=V
x
L
O
I max=I max+
L
O
1-
V
O
D
I
L
V
I
2
L xf
TPS62220, TPS62221, TPS62222
TPS62223, TPS62224, TPS62227
TPS62228, TPS62229
SLVS491D–SEPTEMBER 2003–REVISED MARCH 2006
The pole is calculated as:
with R2 = lower resistor of voltage divider and C2 = lower capacitor of voltage divider.
For an output filter combination of L = 4.7 μH and C
O
= 10 μF, C1 and C2 must be selected to place a zero at 22
kHz, and a pole at 8 kHz. Choose components close to the calculated values.
Table 2. Compensation Selection
L
C
O
f
Z
f
P
4.7 μH
10 μF, 22 μF
22 kHz
8 kHz
Figure 15. Typical Application Circuit for the TPS62220 With Adjustable Output Voltage
where:
The highest inductor current occurs at maximum Vin. A more conservative approach is to select the inductor
current rating just for the maximum switch current of 880 mA. See
Table 3
for inductor selection.
f = switching frequency (1.25-MHz typical, 800-kHz minimal)
L = inductor value
I
L
= peak-to-peak inductor ripple current
I
L
max = maximum inductor current
14
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| TPS62229DDCTG4 | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.7V Out 400mA 95% Eff Step-Down Cnvrtr 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 |
| TPS62230DRYR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3 MHz Ultra Small 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 |
| TPS62230DRYT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 3 MHz Ultra Small 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 |
| TPS62230DRYT | 制造商:Texas Instruments 功能描述:DC/DC Converter IC 制造商:Texas Instruments 功能描述:IC, STEP-DOWN CONVERTER, SON-6 |
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