- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69508 > TPS40021PWP (TEXAS INSTRUMENTS INC) 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 PDF資料下載
參數(shù)資料
| 型號： | TPS40021PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | GREEN, PLASTIC, HTSSOP-16 |
| 文件頁數(shù)： | 6/36頁 |
| 文件大?。?/td> | 724K |
| 代理商： | TPS40021PWP |
第1頁第2頁第3頁第4頁第5頁當前第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頁第34頁第35頁第36頁
TPS40020
TPS40021
SLUS535D MARCH 2003 REVISED JULY 2007
www.ti.com
14
APPLICATION INFORMATION
Synchronization
The TPS4002x can be synchronized to an external reference frequency higher than the free running oscillator
frequency. The recommended method is to use a diode and a push pull drive signal as shown in Figure 6.
PREFERRED
UDG03032
ALTERNATE
Minumize
Output/Stray
Capacitance
on ILIM Node
1
2
ILIM/SYNC
VDD
TPS4002XPWP
VDD
1
2
ILIM/SYNC
VDD
TPS4002XPWP
VDD
50 ns to 100 ns
Figure 6. Synchronization Methods
This design allows synchronization up to the maximum operating frequency of 1 MHz. For best results the
nominal operating frequency of a converter that is to be synchronized should be kept as close as practicable
to the synchronization frequency to avoid excessive noise induced pulse width jitter. A good target is to shoot
for the free run frequency to be 80% of the synchronized frequency. This ensures that the synchronization
source is the frequency determining element in the system and not to adversely affect noise immunity.
Other methods of implementing the synchronization function include using an open collector or open drain
output device directly, or discreet devices to pull the ILIM/SYNC pin down. These do work but performance can
suffer at high frequency because the ILIM/SYNC pin must rise to (VDD 1.0 V) before the next switching cycle
begins. Any time that this requires is directly subtracted from the maximum pulse width available and should
be considered when choosing devices to drive ILIM/SYNC. Consequently, the lowest output capacitance
devices work best.
During a synchronization cycle, the current sink on the ILIM/SYNC pin becomes disabled when ILIM/SYNC is
pulled below 1.0 V. The ILIM/SYNC current sink remains disabled until ILIM/SYNC reaches (VDD 1.0 V) This
removes the load on the ILIM/SYNC pin to allow the voltage to slew rapidly depending on the ILIM resistor and
any stray capacitance on the pin. To maximize this slew rate, minimize stray capacitance on this pin.
The duration of the synchronization pulse pulling ILIM/SYNC low shoud be between 50 ns and 100 ns. Longer
durations may limit the maximum obtainable duty cycle.
相關PDF資料 |
PDF描述 |
|---|---|
| TPS40020PWPRG4 | 0.01 A SWITCHING CONTROLLER, 1100 kHz SWITCHING FREQ-MAX, PDSO16 |
| TPS40040DRBRG4 | 7.2 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS40040DRBT | 7.2 A SWITCHING CONTROLLER, 350 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS40041DRBRG4 | 7.2 A SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS40050QPWPRQ1 | SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| TPS40021PWPG4 | 功能描述:DC/DC 開關控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40021PWPR | 功能描述:DC/DC 開關控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40021PWPRG4 | 功能描述:DC/DC 開關控制器 Low Input Sync Buck Cntrlr source/sink 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 |
| TPS40022PWP | 制造商:Texas Instruments 功能描述: |
| TPS40040 | 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 |
發(fā)布緊急采購，3分鐘左右您將得到回復。