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參數資料
| 型號： | TPS40074RHLT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PQCC20 |
| 封裝： | GREEN, PLASTIC, QFN-20 |
| 文件頁數： | 20/41頁 |
| 文件大小： | 765K |
| 代理商： | TPS40074RHLT |
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C
BOOST u
Q
g(TOTAL)
DVBOOST
(44)
K
PWM ^
V
UVLO
1 V
(45)
K
LC +
1 ) s
ESR
C
O
1 ) s
L
R
LOAD
) s2
L
C
O
(46)
Ge(s) + KPWM
K
LC +
V
UVLO
1 V
1 ) s
ESR
C
O
1 ) s
L
R
LOAD
) s2
L
C
O
(47)
DCGAIN + 20
LOG
V
UVLO
1 V
+ 20
LOG(9.14) + 19.3 dB
(48)
SLUS617B – APRIL 2005 – REVISED OCTOBER 2006
CDBP = 1.0 F
CLVBP = 0.1 F
CVDD = 4.7 F
3.2.6 Boost Voltage, CBOOST and DBOOST (optional)
A capacitor charge pump or boost circuit is required to drive an N-channel MOSFET in the switch location of a
buck converter . The TPS40074 contains the elements for this boost circuit. The designer just has to add a
capacitor, CBOOST, from the switch node of the buck power stage to the BOOST pin of the device. Selection of
this capacitor is based on the total gate charge of the switching MOSFET and the allowable ripple on the boost
voltage,
V
BOOST. A ripple of 0.15 V is assumed for this design. Using these two parameters and Equation 44
the minimum value for CBOOST can be calculated.
The total gate charge of the switching MOSFET is 13.3 nC. A minimum CBOOST of 0.089 F is required. A 0.1 F
capacitor was chosen.
This capacitor must be able to withstand the maximum voltage on DBP (10 V in this instance ). A 50 V capacitor
is used for expediancy.
To reduce losses in the TPS40074 and to increase the available gate voltage for the switching MOSFET an
external diode can be added between the DBP pin and the BOOST pin of the device. A small signal schottky
should be used here, such as the BAT54.
3.3 Closing the Feedback Loop, RZ1, RP1, RPZ2, RSET1, RSET2, CZ2, CP2 and CPZ1
A graphical method is used to select the compensation components. This is a standard feedforward buck
converter. Its PWM gain is shown in Equation 45.
The gain of the output L-C filter is given by Equation 46
The PWM and LC gain is, shown in Equation 47.
To describe this in a Bode plot, the DC gain must be expressed in dB. The DC gain is equal to KPWM. To
express this in dB we take its LOG and multiple by 20. For this converter the DC gain is shown in Equation 48.
The pole and zero frequencies should be calculated, also. A double pole is associated with the L-C and a zero is
associated with the ESR of the output capacitor. The frequency at where these occur can be calculated using
the following two equations.
27
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| TPS40074RHLTG4 | 功能描述:DC/DC 開關控制器 Mid Input Sync Buck w/Vltg Feed-Fwd RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 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 |
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| TPS40075RHLR | 功能描述:DC/DC 開關控制器 Wide Input Synch Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
| TPS40075RHLRG4 | 功能描述:DC/DC 開關控制器 Wide Input Synch Buck Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 輸出電壓:1.215 V to 80 V 輸出電流:3.5 A 輸出端數量:1 最大工作溫度:+ 125 C 安裝風格: 封裝 / 箱體:CPAK |
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