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參數資料
| 型號： | TPS51317RGBR |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 1500 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | 4 X 3.50 MM, GREEN, PLASTIC, QFN-20 |
| 文件頁數： | 11/28頁 |
| 文件大小： | 1000K |
| 代理商： | TPS51317RGBR |
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=
=
P P
I
6 A
0.4
2.4 A
(
)
(
)
(
)
(
)
-
-
-
÷
÷
÷
÷
è
è
=
m
OUT
IN
OUT
SW
IN
P P
V
1.5
V
5
1.5
f
V
1 5
V
dT
L
0.43 H
I
1.5 A
=
+
VREF
OUT
LOWER
UPPER
LOWER
V
R
(
)
(
)
-
=
+
=
+
=
P P
OCL dc
OCL valley
1
I
6 A
1.5 A
6.75 A
2
SLUSAH9
– MARCH 2011
DESIGN PROCEDURE
The simplified design procedure is done for a non-droop application using the TPS51317 converter.
Step One
Determine the specifications.
The Rail requirements provide the following key parameters:
1. VOUT = 1.5 V
2. ICC(max) = 6 A
3. IDYN(max) = 3 A
4. ICC(tdc) = 3 A
Step Two
Determine system parameters.
The input voltage range and operating frequency are of primary interest. For example:
1. VIN = 5 V
2. fSW = 1 MHz
Step Three
Determine inductor value and choose inductor.
Smaller values of inductor have better transient performance but higher ripple and lower efficiency. Higher values
have the opposite characteristics. It is common practice to limit the ripple current to 25% to 50% of the maximum
current. In this case, use 40%:
(5)
At fSW = 1 MHz, with a 5-V input and a 1.5-V output:
(6)
For this application, a 0.42-
H, 1.55-mΩ inductor from NEC-TOKIN with part number MPCG0740LR42C is
chosen.
Step Four
Set the output voltage.
(7)
The output voltage is determined by the 2-V reference (VREF) and the resistor dividers (RUPPER and RLOWER).
The output voltage is regulated to the REFIN pin. Because the 2-V reference current capability is limited to less
than 50
A, care should be taken when selecting the resistor dividers. For the current reference design of 1.5 V
Step Five
Calculate OCL.
The DC OCL level of TPS51317 design is determined by Equation 8,
(8)
Copyright
2011, Texas Instruments Incorporated
19
Product Folder Link(s): TPS51317
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS51317RGBT | 功能描述:直流/直流開關轉換器 3.3V/5Vin,6A,DCAP Mode Sync Converter 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 |
| TPS51362RVER | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
| TPS51362RVET | 制造商:Texas Instruments 功能描述:22V INPUT, 10A INTEGRATED FET 制造商:Texas Instruments 功能描述:IC REG BUCK SYNC ADJ 10A 28VQFN |
| TPS51363 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:22-V Input, 8-A or 10-A Converter With Integrated FET |
| TPS51363RVER | 制造商:Texas Instruments 功能描述:Conv DC-DC Single Step Down 3V to 22V 28-Pin VQFN EP T/R 制造商:Texas Instruments 功能描述:IC REG BCK SYNC ADJ 10/8A 28VQFN |
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