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參數(shù)資料
| 型號： | TPS40021EVM-001 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | High-Efficiency Synchronous Buck Converter with PWM Controller Evaluation Module(帶PWM控制器的高效率同步降壓轉(zhuǎn)換器TPS40021的評估模塊) |
| 中文描述： | 高效率同步降壓轉(zhuǎn)換器與PWM控制器評估模塊（帶脈寬調(diào)制控制器的高效率同步降壓轉(zhuǎn)換器TPS40021的評估模塊） |
| 文件頁數(shù)： | 5/13頁 |
| 文件大小： | 405K |
| 代理商： | TPS40021EVM-001 |
SLUU144A April 2003 Revised November 2003
5
TPS40021EVM001 High-Efficiency Synchronous Buck Converter with PWM Controller Evaluation Module
(HPA009)
2.5
MOSFETs and Diode
For a 1.5-V output voltage, the lower the R
DS(on)
of the MOSFET, the higher the efficiency. Due
to the high current and high conduction loss, the MOSFET should have very low conduction
resistance (R
DS(on)
) and thermal resistance. Si7858DP is chosen for its low R
DS(on)
(between
3 m
and 4 m
) and Power-Pak package.
2.6
Current Limiting
Resistor R3 sets the over current limit threshold. The R
DS(on)
of the upper MOSFET is used as a
current sensor. The current limit is initialized at 40% above the maximum output current,
I
OUT(max)
, which is 28 A. Then R3 can be calculated in equation (11) and yields a value of
1.43 k
.
I
LIM
20
V
REF
R4
20
0.7 V
118 k
118.6 ( A)
R3
K
R
DS(on)
I
LIM
( A)
I
OUT
1.5
4 (m )
I
LIM
( A)
28 A
1.43 (k )
where
R
DS(on)
is the on-resistance of Q1 (4 m
)
Temperature coefficient, K=1.5
V
REF
=0.7 V
R4=118 k
2.7
Voltage Sense Regulator
R1 and R2 operate as the output voltage divider. The internal reference voltage (V
REF
) is 0.7 V.
The relationship between the output voltage and divider is described in equation (8). Using a
10-k
resistor for R2 and 1.5-V output regulation, R1 is calculated as 8.66 k
.
V
REF
R1
V
OUT
R1
R2
0.7 V
R1
1.5 V
R1
10 k
R1
8.66 k
2.8
Transient Comparator
The output voltage transient comparators provide a quick response, first strike, approach to
output voltage transients. The output voltage is sensed through a resistor divider at the OSNS
pin, using R5 and R6 shown in Figure 2. If an overvoltage condition is detected, the HDRV gate
drive is shut off and the LDRV gate drive is turned on until the output is returned to regulation.
Similarly, if an output undervoltage condition is sensed, the HDRV gate drive goes to 95% duty
cycle to pump the output back up quickly. The voltage divider should keep same ratio as the
output voltage sensor for the PWM comparator. Resistor R5=8.66 k
and R6=10 k
in this
evaluation module.
(11)
(12)
(13)
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| TPS40021MPWPEP | 功能描述:DC/DC 開關(guān)控制器 Enhanced Prod Synch Buck Controller 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 |
| TPS40021MPWPREP | 功能描述:DC/DC 開關(guān)控制器 Enhanced Prod Synch Buck Controller 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 |
| TPS40021PWP | 功能描述:DC/DC 開關(guān)控制器 Low 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 |
| TPS40021PWPG4 | 功能描述:DC/DC 開關(guān)控制器 Low 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 |
| TPS40021PWPR | 功能描述:DC/DC 開關(guān)控制器 Low 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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