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參數(shù)資料
| 型號： | TPS40009DGQG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | 3.05 X 4.98 MM, GREEN, PLASTIC, MSOP-10 |
| 文件頁數(shù)： | 2/28頁 |
| 文件大?。?/td> | 677K |
| 代理商： | TPS40009DGQG4 |
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TPS40007
TPS40009
SLUS589B NOVEMBER 2003 REVISED FEBRUARY 2005
10
www.ti.com
APPLICATION INFORMATION
Figure 4 shows the behavior of key signals during initial startup, during a fault and a successfully fault recovery.
At time t0, power is applied to the converter. The voltage on the soft-start capacitor (VCSS) begins to ramp up.
At t1, the soft-start period is completed and the converter is regulating its output at the desired voltage level.
From t0 to t1, pulse-by-pulse current limiting is in effect, and from t1 onward, overcurrent pulses are counted
for purposes of determining a possible fault condition. At t2, a heavy overload is applied to the converter. This
overload is in excess of the overcurrent threshold. The converter starts limiting current and the output voltage
falls to some level depending on the overload applied. During the period from t2 to t3, the counter is counting
overcurrent pulses, and at time t3 reaches a full count of 7. The soft-start capacitor is then discharged, the
counter is decremented, and a fault condition is declared.
VDD
VOUT
ILOAD
UDG03160
t
FAULT
t0
t1
t2 t3
t10
0
6
5
4
3
2
1
0
t4
t5
t6
t7
t8
t9
COUNTER
1 2
3 4
5 6
7
0.6 V
~ 1.3 V
~ 0.6 V
VCSS
Figure 4. Overcurrent/Fault Waveforms
When the soft start capacitor is fully discharged, it begins charging again at the same rate that it does on startup,
with a nominal 3.7-
A current source. When the capacitor voltage crosses 1.3 V, it is discharged again and the
counter is decremented by one count. These transitions occur at t3 through t9. Not shown in Figure 4 is that
between t3 and t9, LDRV is maintained OFF. At t9, the counter has been decremented to 0. The fault logic is
then cleared, the outputs are enabled, and the converter attempts to restart with a full soft-start cycle. The
converter comes into regulation at t10.
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| TPS40009DGQR | 功能描述:DC/DC 開關(guān)控制器 Low Input Sync Buck src/sink w/prebias 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 |
| TPS40009DGQRG4 | 功能描述:DC/DC 開關(guān)控制器 Low Input Sync Buck src/sink w/prebias 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 |
| TPS40009EVM-001 | 功能描述:電源管理IC開發(fā)工具 TPS40009-001 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 |
| TPS40020 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:ENHANCED LOW INPUT VOLTAGE MODE SYNCHRONOUS BUCK CONTROLLER |
| TPS40020PWP | 功能描述:DC/DC 開關(guān)控制器 Enhanced Low Input 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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