參數(shù)資料
型號： TPS40074RHLRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20
封裝： GREEN, PLASTIC, QFN-20
文件頁數(shù)： 19/41頁
文件大小： 765K
代理商： TPS40074RHLRG4
www.ti.com
t
START w 2p
L
C
O
(37)
C
SS w
12
10*6
0.7
t
START
(38)
I
SCP w
C
O
V
OUT
t
START
) ILOAD )
DI
2
(39)
R
ILIM +
100
R
DS(on)MAX
I
SCP ) VILIM(min) ) 4.5 V
109
I
LIM(max)
(40)
I
SCP(min) +
1.09
I
ILIM(min)
R
ILIM * 0.045 V * VILIM(max)
R
DS(on)MAX
(41)
I
SCP(max) +
1.09
I
ILIM(max)
R
ILIM * 0.045 V * VILIM(min)
R
DS(on)MIN
(42)
C
ILIM(max) +
V
O
0.2
V
IN
R
ILIM
f
SW
(43)
SLUS617B – APRIL 2005 – REVISED OCTOBER 2006
V
UVLO(on) is in volts
R
KFF and RT are in k
This equation gives a RKFF value of 154.7 k. The closest lower standard value should be selected. For this
design and using E24 resistor range 154 k
was chosen. This yields a typical start voltage of 9.14 V.
3.2.3 Soft Start Capacitor
It is good practice to limit the rise time of the output voltage. This helps prevent output overshoot and possible
damage to the load. The selection of the soft start time is arbitrary, but it must meet one condition; it should be
greater than the time constant of the output filter, L and CO. This time is given by Equation 37
The soft-start time must be greater than 0.281 ms. A time of 1 ms was chosen, this time also helps keep the
initial input current during start up low. The value of CSS can be calculated using Equation 38.
CSS should be greater than 17 nF, a 22 nF MLCC was chosen. The calculated start time using this capacitor is
1.28 ms.
3.2.4 Short Circuit Protection, RILIM and CILIM
Short circuit protection is programmed using the RILIM resistor. Selection of this resistor depends on the RDS(on) of
the switching MOSFET selected and the required short circuit current trip point, ISCP. The minimum ISCP is limited
by the inductor peak current, the output voltage, the output capacitor and the soft start time. Their relationship is
given by Equation 39. A short circuit current trip point greater than that calculated by this equation should be
used.
The minimum short circuit current trip point for this design is 16.65 A. This value is used in Equation 40 to
calculate the minimum RILIM value.
RILIM is calculated to be 1.59 k . The closest standard value greater than 1.59 k is chose, this is 1.62 k. To
verify that the short circuit current requirements are met the minimum and maximum short circuit current can be
calculated using Equation 41 and Equation 42.
The minimum ISCP is 17.05 A and the maximum is 47.04 A.
It is recommended to add a small capacitor, CILIM, across RILIM. The value of this capacitor should be less than
that calculated in Equation 43.
This equation yields a maximum CILIM of 38 pF. A value half this is chosen, 22 pF.
3.2.5 Voltage Decoupling Capacitors, CDBP, CLVBP and CVDD
Several pins on the TPS40074 have DC voltages. It is recommended to add small decoupling capacitors to
these pins. Below is a list of the recommended values.
26
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40074RHLT 功能描述:DC/DC 開關(guān)控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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
TPS40074RHLTG4 功能描述:DC/DC 開關(guān)控制器 Mid Input Sync Buck w/Vltg Feed-Fwd 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
TPS40075 制造商:TI 制造商全稱:Texas Instruments 功能描述:4.5V TO 18V INPUT 10 PIN SYNCHRONOUS BUCK CONTROLLER WITH POWER GOOD
TPS40075EVM-001 功能描述:電源管理IC開發(fā)工具 15A 12V In 1.5V Out Eval Mod 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
TPS40075RHLR 功能描述:DC/DC 開關(guān)控制器 Wide Input 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
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