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参数资料
| 型号： | TPS40304DRCR |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封装： | 3 X 3 MM, GREEN, PLASTIC, SON-10 |
| 文件页数： | 7/31页 |
| 文件大小： | 1798K |
| 代理商： | TPS40304DRCR |
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(
)
(
)
OUT
IN m ax
OUT
SW
IN m ax
V
1
14 V
1.8 V
1
L
471nH
0.3
I
V
f
0.3
10 A
14 V
1200 kHz
-
=
=
(
)
(
)
2
1
RIPPLE
OUT
RIPPLE
L rms
L avg
12
I
10
3.5
10.05 A
=
+
=
+
=
+
=
2
TRAN
OVER
OUT
I
L
I
L
V
T
C
V
C
<
D =
=
(
)
2
TRAN
UNDER
OUT
IN
OUT
IN
OUT
I
L
I
L
V
T
C
V
C
<
D
=
=
-
(
)
2
TRAN(max)
OUT(min)
OUT
OVER
I
L
4
400nH
C
35 F
1.8 100mV
V
=
m
RIPPLE
RIPPLE(total)
RIPPLE(cap)
OUT
SW
MAX
RIPPLE
I
V
8 C
f
ESR
I
3.5 A
36mV
8 35 F 1200kHz
7m
3.5 A
-
÷
-
è
=
-
÷
m
è
=
W
www.ti.com
SLUS964 – NOVEMBER 2009
Inductor Selection (L1)
Synchronous buck power inductors are typically sized for approximately 30% peak-to-peak ripple current (IRIPPLE)
Given this target ripple current, the required inductor size can be calculated in Equation 3.
(3)
Selecting a standard 400-nH inductor value, solve for IRIPPLE =3.5 A
The RMS current through the inductor is approximated by Equation 4.
(4)
Output Capacitor Selection (C12)
The selection of the output capacitor is typically driven by the output transient response. Equation 5 and
Equation 6 overestimate the voltage deviation to account for delays in the loop bandwidth and can be used to
determine the required output capacitance.
(5)
(6)
If VIN(min) > 2 x VOUT, use overshoot (Equation 5) to calculate minimum output capacitance. If VIN(min) < 2 x VOUT,
use undershoot(Equation 6) to calculate minimum output capacitance.
(7)
With a minimum capacitance, the maximum allowable ESR is determined by the maximum ripple voltage and is
approximated by Equation 8.
(8)
Two 0805, 22-F, 6.3 V, X5R ceramic capacitors are selected to provide more than 35-F of minimum
capacitance and less than 7 m
Ω of ESR (2.5 mΩ each).
Copyright 2009, Texas Instruments Incorporated
15
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相关代理商/技术参数 |
参数描述 |
|---|---|
| TPS40304DRCT | 功能描述:DC/DC 开关控制器 3-20V Wide Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
| TPS40304DRCT | 制造商:Texas Instruments 功能描述:Synchronous Buck Controller IC 制造商:Texas Instruments 功能描述:IC, SYNC BUCK CONTROLLER, SON-10 |
| TPS40304EVM-353 | 功能描述:电源管理IC开发工具 Eval with NexFET Pwr MOSFETs RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| TPS40305 | 制造商:TI 制造商全称:Texas Instruments 功能描述:3-V TO 20-V INPUT SYNCHRONOUS BUCK CONTROLLER |
| TPS40305DRCR | 功能描述:DC/DC 开关控制器 3-20V Wide Input Sync Buck Controller RoHS:否 制造商:Texas Instruments 输入电压:6 V to 100 V 开关频率: 输出电压:1.215 V to 80 V 输出电流:3.5 A 输出端数量:1 最大工作温度:+ 125 C 安装风格: 封装 / 箱体:CPAK |
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