參數(shù)資料
型號： TPS62224DDC
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)： 14/20頁
文件大?。?/td> 464K
代理商： TPS62224DDC
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
IL
Vout
1–Vout
Vin
L
f
I
Lmax
I
outmax
IL
2
f = switching frequency (1.25 MHz typical, 800 kHz minimal)
L = inductor value
I
L
= peak-to-peak inductor ripple current
I
Lmax
= maximum inductor current
TPS62220, TPS62221, TPS62222
TPS62223, TPS62224
TPS62228, TPS62229
SLVS491C–SEPTEMBER 2003–REVISED SEPTEMBER 2004
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 need to 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
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. SeeTable 3 for inductor selection.
14
相關(guān)PDF資料
PDF描述
TPS62220DDC 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
TPS62221DDC 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
TPS62222DDC 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
TPS62229DDC 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
TPS62223DDC 400-mA, 1.25-MHz, HIGH-EFFICIENCY, STEP-DOWN CONVERTER IN THIN-SOT23
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS62224DDCR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.6V Out 400mA 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
TPS62224DDCRG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.6V Out 400mA 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
TPS62224DDCT 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.6V Out 400mA 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
TPS62224DDCTG4 功能描述:直流/直流開關(guān)調(diào)節(jié)器 1.6V Out 400mA 95% Eff St-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
TPS62225DDCR 功能描述:直流/直流開關(guān)調(diào)節(jié)器 2.2V 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
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