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| 型号： | TPS40054PWPRG4 |
| 厂商： | TEXAS INSTRUMENTS INC |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封装： | GREEN, PLASTIC, HTSSOP-16 |
| 文件页数： | 18/35页 |
| 文件大小： | 866K |
| 代理商： | TPS40054PWPRG4 |
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页第17页当前第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页第32页第33页第34页第35页
A
MOD(f) + AMOD
f
LC
f
C
2
+ 5
4.93 kHz
20 kHz
2
+ 0.304
(71)
G +
1
A
MOD(f)
+
1
0.304 +
3.29
(72)
f
Z2 +
1
2p
R1
C3 N
C3 +
1
2p
100 kW
4.93 kHz +
323 pF, choose 330 pF
(73)
f
P2 +
1
2p
R3
C3 N
R3 +
1
2p
330 pF
73.3 kHz +
6.55 kW, choose 6.49 kW
(74)
f
C +
1
2p
R1
C2
G N
C2 +
1
2p
100 kW
3.29
20 kHz +
24.2 pF, choose 22 pF
(75)
f
P1 +
1
2p
R2
C2 N
R2 +
1
2p
22 pF
73.3 kHz +
98.2 kW, choose 97.6 kW
(76)
f
Z1 +
1
2p
R2
C1 N
C1 +
1
2p
97.6 kW
4.93 kHz +
331 pF, choose 330 pF
(77)
R
BIAS +
0.7 V
R1
V
O * 0.7 V
+
0.7 V
100kW
3.3 V * 0.7 V
+ 26.9 kW, choose 26.7 kW
(78)
CALCULATING THE BOOST AND BP10V BYPASS CAPACITANCE
C
BOOST +
Qg
DV
+
18 nC
0.5 V +
36 nF
(79)
C
BP(10 V) +
Q
gHS ) QgSR
DV
+
2
Qg
DV
+
36 nC
0.5 V +
72 nF
(80)
DESIGN EXAMPLE SUMMARY
www.ti.com ...................................................................................................................................... SLUS593F – DECEMBER 2003 – REVISED SEPTEMBER 2008
Select the double pole location for the Type III compensation network at the output capacitor ESR zero at
73.7 kHz.
The amplifier gain at the crossover frequency of 20 kHz is determined by the reciprocal of the modulator gain
AMOD at the crossover frequency from Equation 26:
And also from Equation 26:
Choose R1 = 100 k
The poles and zeros for a type III network are described in Equation 24 and Equation 25.
The size of the bypass capacitor depends on the total gate charge of the MOSFET being used and the amount
of droop allowed on the bypass capacitor. The BOOST capacitance for the Si7860DP, allowing for a 0.5 voltage
droop on the BOOST pin from Equation 28 is:
and the BP10V capacitance from Equation 29 is
For this application, a 0.1-F capacitor is used for the BOOST bypass capacitor and a 1.0-F capacitor is used
for the BP10V bypass.
Figure 15 shows component selection for the 10-V to 24-V to 3.3-V at 8 A dc-to-dc converter specified in the
design example. For an 8-V input application, it may be necessary to add a Schottky diode from BP10 to BOOST
to get sufficient gate drive for the upper MOSFET. As seen in Figure 7, the BP10 output is about 6 V with the
input at 8 V so the upper MOSFET gate drive may be less than 5 V.
A schottky diode is shown connected across the synchronous rectifier MOSFET as an optional device that may
be required if the layout causes excessive negative SW node voltage, greater than or equal to 2 V.
TPS40054-Q1, TPS40055-Q1 and TPS40057-Q1 automotive qualified versions TPS40055-EP Enhanced product
4.5 to 18V controller with power good TPS40195 4.5 to 18V controller with synchronization power good
TPS40200 Wide input non-synchronous DC-DC controller
Copyright 2003–2008, Texas Instruments Incorporated
25
Product Folder Link(s): TPS40054 TPS40055 TPS40057
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| TPS40055EVM-001 | 功能描述:电源管理IC开发工具 Eval Mod Converter 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 |
| TPS40055EVM-002 | 功能描述:电源管理IC开发工具 Wide Input Range Converter 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 |
| TPS40055MPWPREP | 功能描述:DC/DC 开关控制器 Mil Enh 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 |
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