- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69509 > TPS40057MPWPREP (TEXAS INSTRUMENTS INC) SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 PDF資料下載
參數(shù)資料
| 型號： | TPS40057MPWPREP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 2/33頁 |
| 文件大?。?/td> | 755K |
| 代理商： | TPS40057MPWPREP |
第1頁當前第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁
www.ti.com
Clock
PWM RAMP
PowerGood
VIN
UVLO Threshold
1 2 3 4 5 6 7
1 2
SGLS310A – JULY 2005 – REVISED AUGUST 2005
APPLICATION INFORMATION (continued)
RT is the timing resistance in kW
The variable UVLO function uses a 3-bit full adder to prevent spurious shut-downs or turn-ons due to spikes or
fast line transients. When the adder reaches a total of seven counts in which the ramp duration is shorter than
the clock cycle a power-good signal is asserted and a soft-start initiated and the upper and lower MOSFETS are
turned off.
Once the soft-start is initiated, the UVLO circuit must see a total count of seven cycles in which the ramp
duration is longer than the clock cycle before an undervoltage condition is declared. (See Figure 5 ).
Figure 5. Undervoltage Lockout Operation
The tolerance on the UVLO set point also affects the maximum duty cycle achievable. If the UVLO starts the
device at 10% below the nominal start up voltage, the maximum duty cycle is reduced approximately 10% at the
nominal start up voltage.
The impedance of the input voltage can cause the input voltage, at the controller, to sag when the converter
starts to operate and draw current from the input source. Therefore, there is voltage hysteresis that prevents
nuisance shutdowns at the UVLO point. With RT chosen to select the operating frequency and RKFF chosen to
select the start-up voltage, the approximate amount of hysteresis voltage is shown in Figure 6.
10
相關PDF資料 |
PDF描述 |
|---|---|
| TPS40090RHDRG4 | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28 |
| TPS40091RHDR | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28 |
| TPS40090PWRG4 | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24 |
| TPS40091PWG4 | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PDSO24 |
| TPS40091RHDRG4 | SWITCHING CONTROLLER, 1200 kHz SWITCHING FREQ-MAX, PQCC28 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS40057PWP | 功能描述:DC/DC 開關控制器 Wide 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 安裝風格: 封裝 / 箱體:CPAK |
| TPS40057PWP | 制造商:Texas Instruments 功能描述:CONTROLLER IC |
| TPS40057PWPG4 | 功能描述:DC/DC 開關控制器 Wide 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 安裝風格: 封裝 / 箱體:CPAK |
| TPS40057PWPR | 功能描述:DC/DC 開關控制器 Wide 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 安裝風格: 封裝 / 箱體:CPAK |
| TPS40057PWPRG4 | 功能描述:DC/DC 開關控制器 Wide 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 安裝風格: 封裝 / 箱體:CPAK |
發(fā)布緊急采購，3分鐘左右您將得到回復。