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參數(shù)資料
| 型號： | TPS40040DRBRG4 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 7.2 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| 封裝： | 3 X 3 MM, PLASTIC, SON-8 |
| 文件頁數(shù)： | 3/38頁 |
| 文件大?。?/td> | 741K |
| 代理商： | TPS40040DRBRG4 |
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Enable and Start-Up Sequence
Configure ILIM Threshold
Soft Start
4 ms
1.5 ms
VOUT
ENB
COMP
Soft Start
SLUS700D – MARCH 2006 – REVISED DECEMBER 2007
The EN pin of the TPS40040/1s internally pulled to VDD. When power is applied to VDD, the EN pin is allowed
to float high, and the TPS40040/1 remains OFF. Only when the EN pin is externally pulled below the threshold
voltage of VDD - 1.2 V is the TPS40040/1 allowed to start. When enabled, the TPS40040/1 enters a calibration
cycle where the short circuit current threshold is determined. The TPS40040/1 monitors the current out of the
COMP pin and selects a threshold based on the sensed value of the current. See Selecting the Short Circuit
Current Limit Threshold section for for details. When this calibration time is completed, the soft-start cycle is
allowed to begin. See Figure 19 below.
Figure 19. Startup
DESIGN
If the enable function is not used, the EN pin should be connected to ground
HINT:
(GND).
DESIGN
When designing the feedback loop compensation, ensure the capacitors used
HINT:
are not so large that they distort the COMP pin calibration waveform.
At the end of a calibration cycle, the TPS40040/1 slowly increases the voltage to the non-inverting input of the
error amplifier. In this way, the output voltage slowly ramps up until the voltage on the non-inverting input to the
error amplifier reaches the internal reference voltage. At that time, the voltage at the non-inverting input to the
error amplifier remains at the reference voltage.
During the soft-start interval, pulse-by-pulse current limiting is active. If seven consecutive current limit pulses are
detected, overcurrent is declared and a timeout period equivalent to seven calibration/soft-start cycles goes into
effect. See Output Short Circuit Protection section for details.
Copyright 2006–2007, Texas Instruments Incorporated
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS40040DRBT | 功能描述:DC/DC 開關(guān)控制器 Low Vin Synch Buck DC/DC 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 |
| TPS40040DRBT | 制造商:Texas Instruments 功能描述:Peak Reflow Compatible (260 C):Yes |
| TPS40040DRBTG4 | 功能描述:DC/DC 開關(guān)控制器 Lo Vin Synch Buck DC/DC Cntrlr 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 |
| TPS40040EVM-001 | 功能描述:電源管理IC開發(fā)工具 10A Synch Buck 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 |
| TPS40041 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LOW PIN COUNT, LOW VIN (2.5 V TO 5.5 V) SYNCHRONOUS BUCK DC-TO-DC CONTROLLER WITH ENABLE |
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