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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： | 11/41頁 |
| 文件大小： | 765K |
| 代理商： | TPS40074RHLT |
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TPS40074 POWER DISSIPATION
P
D + Qg
V
DR
f
SW
(Watts driver)
(14)
P
T +
2
P
D
V
DR
) IQ
V
IN
(Watts)
(15)
P
T + 2
Qg
f
SW ) IQ
V
IN
(Watts)
(16)
P
T +
T
J * TA
qJA
(Watts)
(17)
f
SW +
T
J*TA
qJA VIN
* IQ
2
Qg
(Hz)
(18)
BOOST DIODE
LOW VOLTAGE OPERATION
SLUS617B – APRIL 2005 – REVISED OCTOBER 2006
APPLICATION INFORMATION (continued)
The power dissipation in the TPS40074 is largely dependent on the MOSFET driver currents and the input
voltage. The driver current is proportional to the total gate charge, Qg, of the external MOSFETs. Driver power
(neglecting external gate resistance) can be calculated from:
where
V
DR is the driver output voltage
The total power dissipation in the TPS40074, assuming the same MOSFET is selected for both the high-side
and synchronous rectifier is described in Equation 15.
or
where
I
Q is the quiescent operating current (neglecting drivers)
The maximum power capability of the TPS40074 PowerPAD package is dependent on the layout as well as air
flow. The thermal impedance from junction to air ambient assuming 2-oz. copper trace and thermal pad with
solder and no air flow is
θ
JA = 60 °C/W
The maximum allowable package power dissipation is related to ambient temperature by Equation 17.
Substituting Equation 17 into Equation 16 and solving for fSW yields the maximum operating frequency for the
TPS4007x. The result is described in Equation 18.
The TPS40074 has internal diodes to charge the boost capacitor connected from SW to BOOST. The drop
across this diode is rather large at 1.4-V nominal at room temperature resulting in the drive voltage to the
high-side MOSFET being reduced by this amount from the DBP voltage. If this drop is too large for a particular
application, an external diode may be connected from DBP (anode) to BOOST (cathode). This provides
significantly improved gate drive for the high-side MOSFET, especially at lower input voltages.
If the programmable UVLO is set to less than 6.5 V nominal, connect a 330-k
resistor across the soft-start
capacitor. This eliminates a race condition inside the device that can lead to an output voltage overshoot on
power down of the part.
19
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相關代理商/技術參數 |
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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 |
| TPS40075EVM-001 | 功能描述:電源管理IC開發工具 15A 12V In 1.5V Out Eval Mod RoHS:否 制造商:Maxim Integrated 產品: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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