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參數資料
| 型號： | TPS62420DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 1.61 A DUAL SWITCHING CONTROLLER, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件頁數： | 20/37頁 |
| 文件大小： | 1020K |
| 代理商： | TPS62420DRCT |
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I
RMSCout + Vout
1 *
Vout
Vin
L
1
2
3
DVout + Vout
1 *
Vout
Vin
L
1
8
Cout
)
ESR
www.ti.com
SLVS676C – JUNE 2006 – REVISED JUNE 2010
Table 7. List of Inductors
DIMENSIONS [mm3]
INDUCTOR TYPE
SUPPLIER
3.2×2.6×1.0
MIPW3226
FDK
3×3×0.9
LPS3010
Coilcraft
2.8×2.6×1.0
VLF3010
TDK
2.8x2.6×1.4
VLF3014
TDK
3×3×1.4
LPS3015
Coilcraft
3.9×3.9×1.7
LPS4018
Coilcraft
Output Capacitor Selection
The advanced fast response voltage mode control scheme of the two converters allows the use of small ceramic
capacitors with a typical value of 10mF, without having large output voltage under and overshoots during heavy
load transients. Ceramic X7R/X5R capacitors having low ESR values result in lowest output voltage ripple and
are therefore recommended.
If ceramic output capacitors are used, the capacitor RMS ripple current rating will always meet the application
requirements. The RMS ripple current is calculated as:
(8)
At nominal load current the inductive converters operate 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:
(9)
Where the highest output voltage ripple occurs at the highest input voltage Vin.
At light load currents the converters operate in Power Save Mode and the output voltage ripple is dependent on
the output capacitor value. The output voltage ripple is set by the internal comparator delay and the external
capacitor. Higher output capacitors like 22mF values minimize the voltage ripple in PFM Mode and tighten DC
output accuracy in PFM Mode.
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 converters need a ceramic input capacitor of 10mF. The input capacitor can be increased
without any limit for better input voltage filtering.
LAYOUT CONSIDERATIONS
As for all switching power supplies, the layout is an important step in the design. Proper function of the device
demands careful attention to PCB layout. Care must be taken in board layout to get the specified performance. If
the layout is not carefully done, the regulator could show poor line and/or load regulation, stability issues as well
as EMI problems. It is critical to provide a low inductance, impedance ground path. Therefore, use wide and
short traces for the main current paths as indicated in bold in Figure 36.
The input capacitor should be placed as close as possible to the IC pins as well as the inductor and output
capacitor.
Copyright 2006–2010, Texas Instruments Incorporated
27
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS62420DRCT | 制造商:Texas Instruments 功能描述:DC/DC Converter IC 制造商:Texas Instruments 功能描述:IC, DUAL STEP-DOWN CONVERTER, SON-10 |
| TPS62420DRCTG4 | 功能描述:直流/直流開關調節器 Dual Adj 600mA & 1000mA 2.25MHz 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62420EVM-167 | 功能描述:電源管理IC開發工具 STEP DOWN CONVERTER 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 |
| TPS62420QDRCRQ1 | 功能描述:直流/直流開關調節器 Dual,Adj,600mA&1000 mA,2.25MHz 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 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
| TPS62421DRCR | 功能描述:直流/直流開關轉換器 2.25MHz 600mA/1000 mA Dual Step Down RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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