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參數(shù)資料
| 型號： | TPS62290DRV |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | Half Bridge Gate Driver; Package: 8-SO-8; Container: Tape & Reel |
| 中文描述： | 1降壓轉換器2步驟× 2 SON封裝 |
| 文件頁數(shù)： | 14/23頁 |
| 文件大?。?/td> | 615K |
| 代理商： | TPS62290DRV |
www.ti.com
I
L
Vout
1
Vout
Vin
I
L
2
L
(1)
I
Lmax
I
outmax
(2)
Output Capacitor Selection
I
RMSCout
Vout
1
Vout
Vin
L
1
2
3
(3)
Vout
Vout
1
Vout
Vin
L
1
8
Cout
ESR
(4)
TPS62290
SLVS764–JUNE 2007
APPLICATION INFORMATION (continued)
Equation 1
calculates the maximum inductor current under static load conditions. The saturation current of the
inductor should be rated higher than the maximum inductor current as calculated with
Equation 2
. This is
recommended because during heavy load transient the inductor current will rise above the calculated value.
With:
f = Switching Frequency (2.25MHz typical)
L = Inductor Value
I
L
= Peak to Peak inductor ripple current
I
Lmax
= Maximum Inductor current
A more conservative approach is to select the inductor current rating just for the maximum switch current of the
corresponding converter.
Accepting larger values of ripple current allows the use of low inductance values, but results in higher output
voltage ripple, greater core losses, and lower output current capability.
The total losses of the coil have a strong impact on the efficiency of the dc/dc conversion and consist of both the
losses in the dc resistance (R
(DC)
) and the following frequency-dependent components:
The losses in the core material (magnetic hysteresis loss, especially at high switching frequencies)
Additional losses in the conductor from the skin effect (current displacement at high frequencies)
Magnetic field losses of the neighboring windings (proximity effect)
Radiation losses
Table 2. List of Inductors
DIMENSIONS [mm
3
]
3
×
3
×
1.5
INDUCTOR TYPE
LPS3015
SUPPLIER
Coilcraft
The advanced fast-response voltage mode control scheme of the TPS62290 allows the use of tiny ceramic
capacitors. Ceramic capacitors with low ESR values have the lowest output voltage ripple and are
recommended. The output capacitor requires either an X7R or X5R dielectric. Y5V and Z5U dielectric
capacitors, aside from their wide variation in capacitance over temperature, become resistive at high
frequencies.
At nominal load current, the device operates in PWM mode and the RMS ripple current is calculated as:
At nominal load current, the device operates in PWM mode and the overall output voltage ripple is the sum of
the voltage spike caused by the output capacitor ESR plus the voltage ripple caused by charging and
discharging the output capacitor:
At light load currents the converter operates in Power Save Mode and the output voltage ripple is dependent on
the output capacitor and inductor value. Larger output capacitor and inductor values minimize the voltage ripple
in PFM mode and tighten dc output accuracy in PFM mode.
14
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS62290DRVR | 功能描述:直流/直流開關調節(jié)器 2.25MHz 1A Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62290DRVRG4 | 功能描述:直流/直流開關調節(jié)器 2.25MHz 1A Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62290DRVT | 功能描述:直流/直流開關調節(jié)器 2.25MHz 1A Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62290DRVT | 制造商:Texas Instruments 功能描述:DC/DC Converter IC |
| TPS62290DRVTG4 | 功能描述:直流/直流開關調節(jié)器 2.25MHz 1A Step- Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率: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: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
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