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參數(shù)資料
| 型號： | TPS62040DRC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 1.2 A/1.25 MHZ, HIGH EFFICIENCY STEP DOWN CONVERTER |
| 中文描述： | 1.2 A/1.25兆赫，高效降壓轉換器 |
| 文件頁數(shù)： | 15/21頁 |
| 文件大?。?/td> | 372K |
| 代理商： | TPS62040DRC |
SLVS463A JUNE 2003 REVISED OCTOBER 2003
www.ti.com
15
Output Capacitor Selection
The advanced fast response voltage mode control scheme of the TPS6204x allows the use of small ceramic
capacitors with a typical value of 22
μ
F without having large output voltage under and overshoots during heavy load
transients. Ceramic capacitors having low ESR values have the lowest output voltage ripple and are recommended.
If required, tantalum capacitors may also be used. Refer to Table 2 for component selection.
If ceramic output capacitor are used, the capacitor RMS ripple current rating always meets the application
requirements. Just for completeness the RMS ripple current is calculated as:
IRMSCout
VO
1–
VO
VI
L
1
2
3
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:
VO
VO
1–
VO
VI
L
1
8
CO
ESR
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.
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 22
μ
F. The input capacitor can be increased without any limit
for better input voltage filtering.
Table 2. Input and Output Capacitor Selection
CAPACITOR
VALUE
CASE SIZE
COMPONENT SUPPLIER
COMMENTS
22
μ
F
22
μ
F
1206
Taiyo Yuden JMK316BJ226ML
Ceramic
1210
Taiyo Yuden JMK325BJ226MM
Ceramic
(8)
(9)
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS62040DRCR | 功能描述:直流/直流開關調節(jié)器 Adj 1.2A Hi-Eff Step-Down 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 |
| TPS62040DRCR | 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-10 |
| TPS62040DRCR | 制造商:Texas Instruments 功能描述:IC DC/DC CONVERTER |
| TPS62040DRCRG4 | 功能描述:直流/直流開關調節(jié)器 Adj 1.2A Hi-Eff Step-Down 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 |
| TPS62040EVM-229 | 功能描述:電源管理IC開發(fā)工具 TPS62040-229 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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