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參數(shù)資料
| 型號： | TPS53353DQPT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING REGULATOR, PDSO22 |
| 封裝： | 5 X 6 MM, ROHS COMPLIANT, PLASTIC, SON-22 |
| 文件頁數(shù)： | 13/25頁 |
| 文件大小： | 556K |
| 代理商： | TPS53353DQPT |
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-
-
=
=
IN
OUT
IN
OUT
max
SW
IN
OUT
SW
IN(max)
IND ripple
max
V
1
3
L
I
f
V
I
f
V
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-
=
+
IN
OUT
max
TRIP
IND peak
SW
IN
DS on
max
V
1
I
32
R
L
f
V
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( )
-
=
W
OUT
SW
IND ripple
V
10 mV
(1
D)
10 mV
L
f
L
f
ESR
0.6 V
I
0.6 V
60
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-
=
IND ripple
OUT
I
ESR
V
0.6
2
R1
R2
0.6
SLUSAK2
– AUGUST 2011
External Component Selection
The external components selection is a simple process when using organic semiconductors or special polymer
output capacitors.
1. SELECT OPERATION MODE AND SOFT-START TIME
Select operation mode and soft-start time using Table 1.
2. SELECT SWITCHING FREQUENCY
Select the switching frequency from 250 kHz to 1 MHz using Table 2.
3. CHOOSE THE INDUCTOR
The inductance value should be determined to give the ripple current of approximately 1/4 to 1/2 of maximum
output current. Larger ripple current increases output ripple voltage and improves signal-to-noise ratio and
helps ensure stable operation, but increases inductor core loss. Using 1/3 ripple current to maximum output
current ratio, the inductance can be determined by Equation 6.
(6)
The inductor requires a low DCR to achieve good efficiency. It also requires enough room above peak
inductor current before saturation. The peak inductor current can be estimated in Equation 7.
(7)
4. CHOOSE THE OUTPUT CAPACITOR(S)
When organic semiconductor capacitor(s) or specialty polymer capacitor(s) are used, for loop stability,
capacitance and ESR should satisfy Equation 5. For jitter performance, Equation 8 is a good starting point to
determine ESR.
where
D is the duty factor.
The required output ripple slope is approximately 10 mV per tSW (switching period) in terms of VFB terminal
voltage.
(8)
5. DETERMINE THE VALUE OF R1 AND R2
The output voltage is programmed by the voltage-divider resistor, R1 and R2 shown in Figure 38. R1 is
connected between VFB pin and the output, and R2 is connected between the VFB pin and GND.
Recommended R2 value is from 10 k
Ω to 20 kΩ. Determine R1 using Equation 9.
(9)
20
Copyright
2011, Texas Instruments Incorporated
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS53353DQPT | 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV 20A QFN22 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, 制造商:Texas Instruments 功能描述:SYNCHRONOUS BUCK CONV, 20A, QFN22, Primary Input Voltage:15V, No. of Outputs:1, Output Voltage:5.5V, Output Current:20A, No. of Pins:22, Operating Temperature Min:-40C, Operating Temperature Max:85C, MSL:- , RoHS Compliant: No |
| TPS53353EVM-744 | 功能描述:電源管理IC開發(fā)工具 HI-EFF,20A,SYNC BUCK CONVERTER RoHS:否 制造商:Maxim Integrated 產(chǎn)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 |
| TPS53355 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:High-Efficiency 30-A Synchronous Buck Converter with Eco-modea?￠ |
| TPS53355DQPR | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 HI-EFF,30A,SYNC BUCK 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 |
| TPS53355DQPT | 功能描述:直流/直流開關(guān)調(diào)節(jié)器 HI-EFF,30A,SYNC BUCK 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 |
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