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參數資料
| 型號： | TPS40022PWP |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.01 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | POWERPAD, PLASTIC, HTSSOP-16 |
| 文件頁數： | 5/29頁 |
| 文件大小： | 337K |
| 代理商： | TPS40022PWP |
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TPS40020
TPS40021
TPS40022
SLUS535 – MARCH 2003
www.ti.com
13
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 5.
1
2
ILIM/SYNC
VDD
TPS4002XPWP
VDD
1
2
ILIM/SYNC
VDD
TPS4002XPWP
VDD
Pulse Generator
VDD to GND
Push–Pull
PREFERRED
ALTERNATE
Output/Stray
Capacitance:
Minimize
Open
Drain
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.
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相關代理商/技術參數 |
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| 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 |
| TPS40040DRBR | 功能描述:DC/DC 開關控制器 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 |
| TPS40040DRBRG4 | 功能描述:DC/DC 開關控制器 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 |
| TPS40040DRBT | 功能描述:DC/DC 開關控制器 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 |
| TPS40040DRBT | 制造商:Texas Instruments 功能描述:Peak Reflow Compatible (260 C):Yes |
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