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參數(shù)資料
| 型號： | TPS40055EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TPS40055 EVALUATION MODULE(TPS40055評估模塊) |
| 中文描述： | TPS40055評估模塊（TPS40055評估模塊） |
| 文件頁數(shù)： | 10/18頁 |
| 文件大小： | 350K |
| 代理商： | TPS40055EVM |
SLUU190 April 2004
10
Wide Range Input TPS40055 Converter Delivers 5 Volts at 2 Amps
4.8
Short circuit protection
The TPS40055 implements short circuit protection by comparing the voltage across the topside MOSFET while
it is ON to a voltage developed across R
LIM
due to an internal current source of 10
μ
A inside pin 16. Both of these
voltages are negative with respect to V
IN
. From the datasheet equation, R
LIM
is defined as:
R
LIM
R9
I
OC
1.12
R
DS(on)
I
SINK
V
OS
I
SINK
Here, I
OC
is the overcurrent set point equal to the dc output current plus one half the inductor ripple current, V
OS
is the overcurrent comparator offset, and I
SINK
is the current into the I
LIM
pin 16. Using worst case tolerances
the value of R
LIM
should be maximized to ensure that the converter can deliver full rated current under all
conditions. Looking at worst case conditions, R
LIM
= R9 is found to be:
R
LIM
(3 A
0.3 A)
1.12
(55 m
8.65 A
1.4)
23 mV
8.65 A
23.5 k
The standard value of 23.5 k
was selected. This ensures that we can deliver a minimum of 3 A before current
limit is activated. There is also a small capacitor, C8, placed in parallel with R9 to filter the signal.
4.9
Snubber component selection
The junction of Q1, Q2, and L1 rises fast enough to contribute to dV/dT induced voltage on the gate of Q1:B.
A snubber consisting of C12 and R10 is added to slow down the rise time of the switch node.
4.10 Compensation components
The TPS40055 uses voltage mode control in conjunction with a high frequency error amplifier. The power circuit
L/C double pole corner frequency fc is situated at 1.8 kHz. The feedback compensation network is implemented
to provide two zeroes and three poles. The first pole is placed at the origin to improve dc regulation.
The two zeros are placed near 1.96 kHz,
f
Z1
1
2
R
4
C
4
and
f
Z2
1
2
R
6
R
7
C
5
The second pole is placed at 66 kHz,
f
p1
1
2
R
4
C
3
C
3
C
4
C
4
and the third pole is placed at 159 kHz, which is near one-half of the switching frequency.
f
p2
1
2
R
7
C
5
(10)
(11)
(12)
(13)
(14)
(15)
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| TPS40055EVM-001 | 功能描述:電源管理IC開發(fā)工具 Eval Mod Converter RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40055EVM-002 | 功能描述:電源管理IC開發(fā)工具 Wide Input Range Converter RoHS:否 制造商:Maxim Integrated 產(chǎn)品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS40055MPWPREP | 功能描述:DC/DC 開關(guān)控制器 Mil Enh Wide Input Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055MPWPREPG4 | 功能描述:DC/DC 開關(guān)控制器 Synch Buck Cntrlr, source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
| TPS40055PWP | 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數(shù)量:1 最大工作溫度:+ 125 C 安裝風(fēng)格: 封裝 / 箱體:CPAK |
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