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| 型号： | TPS51461RGET |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING REGULATOR, 1000 kHz SWITCHING FREQ-MAX, PQCC24 |
| 封装： | 4 X 4 MM, GREEN, PLASTIC, QFN-24 |
| 文件页数： | 17/31页 |
| 文件大小： | 1627K |
| 代理商： | TPS51461RGET |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页当前第17页第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页
=
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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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS51462 | 制造商:TI 制造商全称: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:开关变换器、稳压器与控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS51462RGET | 功能描述:开关变换器、稳压器与控制器 3.3V/5Vin,DCAP Mode Sync SD Integ FET RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| TPS51463 | 制造商:TI 制造商全称: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/直流开关转换器 3.3V/5Vin,Sync SD Integr FET Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
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