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參數資料
| 型號： | TPS51461RGET |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封裝： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件頁數： | 17/31頁 |
| 文件大小： | 1627K |
| 代理商： | TPS51461RGET |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁當前第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁
=
m
SLEW
SS
SLEW
C
0.9 V
10 nF
0.9 V
t
900
s
I
10 A
(
)
(
)
-
=
+
=
+
=
P P
OCL dc
OCL valley
1
I
6 A
1.5 A
6.75 A
2
(
)
(
)
(
)
(
)
(
)
(
)
(
)
(
)
÷
D
+
÷
è
=
-
÷
÷
D
-
÷
÷
è
è
2
VOUT
SW
LOAD max
MIN off
IN min
OUT min_ under
VOUT
IN min
SW
VOUT
LOAD insert
MIN off
IN min
V
t
L
I
t
V
C
V
2
V
t
V
(
)
(
)
(
)
(
)
D
=
D
2
OUT
LOAD max
OUT min_ over
VOUT
LOAD release
L
I
C
2
V
SLUSAD9 – DECEMBER 2010
www.ti.com
(10)
Step Six
Calculate OCL.
The DC OCL level of TPS51461 design is determined by Equation 11,
(11)
The minimum valley OCL is 6 A over process and temperature, and IP-P = 1.5 A, the minimum DC OCL is
calculated to be 6.75A.
Step Seven
Determine the output capacitance.
To determine COUT based on transient and stability requirement, first calculate the the minimum output
capacitance for a given transient.
Equation 13 and Equation 12 can be used to estimate the amount of capacitance needed for a given dynamic
load step/release. Please note that there are other factors that may impact the amount of output capacitance for
a specific design, such as ripple and stability. Equation 13 and Equation 12 are used only to estimate the
transient requirement, the result should be used in conjunction with other factors of the design to determine the
necessary output capacitance for the application.
(12)
(13)
Equation 12 and Equation 13 calculate the minimum COUT for meeting the transient requirement, which is
72.9 F assuming the following:
±3% voltage allowance for load step and release
MLCC capacitance derating of 60% due to DC and AC bias effect
In this reference design, 4, 22-F capacitors are used in order to provide this amount of capacitance.
24
Copyright 2010, Texas Instruments Incorporated
Product Folder Link(s): TPS51461
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相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS51462 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAPa?￠ Mode Synchronous Step-Down Integrated FETs Converter With 2-Bit VID |
| TPS51462RGER | 功能描述:開關變換器、穩壓器與控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS51462RGET | 功能描述:開關變換器、穩壓器與控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS51463 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:3.3-V/5-V Input, D-CAP+? Mode Synchronous Step-Down Integrated FETs Converter |
| TPS51463RGER | 功能描述:直流/直流開關轉換器 3.3V/5Vin,Sync SD Integr FET 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 |
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