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參數(shù)資料
| 型號(hào)： | TPS40003EVM |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | TPS40003 Evaluation Module(TPS40003評(píng)估板) |
| 中文描述： | TPS40003評(píng)估模塊（TPS40003評(píng)估板） |
| 文件頁(yè)數(shù)： | 15/17頁(yè) |
| 文件大?。?/td> | 339K |
| 代理商： | TPS40003EVM |
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SLUU130A – September 2002 – Revised February 2003
7
TPS40003-Based 5-A Converter in Less Than One Square Inch
4.4
Output Capacitor Selection
Selection of the output capacitor is based on many application variables, including function, cost, size, and
availability. The minimum allowable output capacitance is determined by the amount of inductor ripple current
and the allowable output ripple in equation (3).
C
OUT(min) +
I
RIPPLE
8
f
V
RIPPLE
+
1.25 A
8
600 kHz
12 mV
+ 22 mF
In this design, COUT(min) is 22 F with VRIPPLE = 12 mV to allow for some margin. However, this only affects the
capacitive component of the ripple voltage. In addition, the voltage component due to the capacitor ESR must
be considered in equation (4).
ESR
Cout v
V
RIPPLE
I
RIPPLE
+ 0.012 V
1.25 A
+ 9.6 mW
For compactness while maintaining transient response capability, two 22-
F ceramic capacitors are fitted in
parallel. The total ESR of these capacitors is below 3 m
, and contributes only a few mV to the output voltage
ripple.
4.5
MOSFET Selection
The small physical size of this design requires the use of a single SO-8 package which contains dual N-channel
MOSFETs. MOSFETs with an RDS(on) of 18 m are selected to keep the conduction losses to a manageable
amount at full load.
4.6
Short Circuit Protection
The TPS40003 implements short circuit protection by comparing the voltage across the topside MOSFET while
it is on to a voltage dropped from VDD by RLIM due to an internal current source of 15 A inside pin 1. Due to
tolerances in the current source and variations in the power MOSFET on-voltage versus temperature, the short
circuit level can protect against gross overcurrent conditions only, and should be set higher than rated load. In
this particular case, RLIM is selected as:
R
LIM +
R1
+
2.5
I
OUT
0.018
W
15
mA
+ 15 kW
For this design, RLIM = 15 k, and the factor of 2.5 in the equation accounts for the variations in component
tolerances over temperature and output current ripple. The high currents that are switched under short circuit
conditions may cause SW pin 8 to be driven below ground several volts, possibly injecting substrate current
which can cause improper operation of the device. A 3.3-
resistor has been placed in series with this pin to
limit its excursion to safe levels.
(3)
(4)
(5)
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| TPS40004DGQ | 功能描述:電壓模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS40004DGQG4 | 功能描述:電壓模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS40004DGQR | 功能描述:電壓模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
| TPS40004DGQRG4 | 功能描述:電壓模式 PWM 控制器 Lo Input 300kHz Freq Synch Buck Cntrlr RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel |
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