- 您現在的位置：買賣IC網 > PDF目錄98282 > TPS54160DRCT (TEXAS INSTRUMENTS INC) SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 PDF資料下載
參數資料
| 型號： | TPS54160DRCT |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩壓器 |
| 英文描述： | SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| 封裝： | PLASTIC, SON-10 |
| 文件頁數： | 5/50頁 |
| 文件大小： | 1375K |
| 代理商： | TPS54160DRCT |
第1頁第2頁第3頁第4頁當前第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頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁
4.6
4.8
5
5.2
5.4
5.6
0
0.05
0.10
0.15
0.20
I
-OutputCurrent- A
O
V
-InputV
oltage-V
I
V
=5V
O
Start
Stop
3
3.2
3.4
3.6
3.8
4
0
0.05
0.10
0.15
0.20
I
-OutputCurrent- A
O
V
-InputV
oltage-V
I
V
=3.3V
O
Start
Stop
www.ti.com
SLVS795C – OCTOBER 2008 – REVISED OCTOBER 2010
DETAILED DESCRIPTION (continued)
Low Dropout Operation and Bootstrap Voltage (BOOT)
The TPS54160 has an integrated boot regulator, and requires a small ceramic capacitor between the BOOT and
PH pins to provide the gate drive voltage for the high-side MOSFET. The BOOT capacitor is refreshed when the
high-side MOSFET is off and the low-side diode conducts. The value of this ceramic capacitor should be 0.1mF.
A ceramic capacitor with an X7R or X5R grade dielectric with a voltage rating of 10V or higher is recommended
because of the stable characteristics overtemperature and voltage.
To improve drop out, the TPS54160 is designed to operate at 100% duty cycle as long as the BOOT to PH pin
voltage is greater than 2.1V. When the voltage from BOOT to PH drops below 2.1V, the high-side MOSFET is
turned off using an UVLO circuit which allows the low-side diode to conduct and refresh the charge on the BOOT
capacitor. Since the supply current sourced from the BOOT capacitor is low, the high-side MOSFET can remain
on for more switching cycles than are required to refresh the capacitor, thus the effective duty cycle of the
switching regulator is high.
The effective duty cycle during dropout of the regulator is mainly influenced by the voltage drops across the
power MOSFET, inductor resistance, low-side diode and printed circuit board resistance. During operating
conditions in which the input voltage drops and the regulator is operating in continuous conduction mode, the
high-side MOSFET can remain on for 100% of the duty cycle to maintain output regulation, until the BOOT to PH
voltage falls below 2.1V.
Attention must be taken in maximum duty cycle applications which experience extended time periods with light
loads or no load. When the voltage across the BOOT capacitor falls below the 2.1V UVLO threshold, the
high-side MOSFET is turned off, but there may not be enough inductor current to pull the PH pin down to
recharge the BOOT capacitor. The high-side MOSFET of the regulator stops switching because the voltage
across the BOOT capacitor is less than 2.1V. The output capacitor then decays until the difference in the input
voltage and output voltage is greater than 2.1V, at which point the BOOT UVLO threshold is exceeded, and the
device starts switching again until the desired output voltage is reached. This operating condition persists until
the input voltage and/or the load current increases. It is recommended to adjust the VIN stop voltage greater
than the BOOT UVLO trigger condition at the minimum load of the application using the adjustable VIN UVLO
feature with resistors on the EN pin.
The start and stop voltages for typical 3.3V and 5V output applications are shown in Figure 26 and Figure 27.
The voltages are plotted versus load current. The start voltage is defined as the input voltage needed to regulate
the output within 1%. The stop voltage is defined as the input voltage at which the output drops by 5% or stops
switching.
During high duty cycle conditions, the inductor current ripple increases while the BOOT capacitor is being
recharged resulting in an increase in ripple voltage on the output. This is due to the recharge time of the boot
capacitor being longer than the typical high-side off time when switching occurs every cycle.
Figure 26. 3.3V Start/Stop Voltage
Figure 27. 5.0V Start/Stop Voltage
Copyright 2008–2010, Texas Instruments Incorporated
13
Product Folder Link(s): TPS54160
相關PDF資料 |
PDF描述 |
|---|---|
| TPS54160DGQ | 2.7 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS54160DGQR | 2.7 A SWITCHING REGULATOR, 2500 kHz SWITCHING FREQ-MAX, PDSO10 |
| TPS5420MDREPG4 | 5.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS5420MDREP | 5.2 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS54225PWP | 4.5 A SWITCHING REGULATOR, 700 kHz SWITCHING FREQ-MAX, PDSO14 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| TPS54160EVM-230 | 功能描述:電源管理IC開發工具 TPS54160 Eval Mod RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54160EVM-535 | 功能描述:電源管理IC開發工具 Eval Mod for High Brightness LED Drvr RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
| TPS54160-Q1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.5-A 60-V STEP-DOWN SWIFT DC/DC CONVERTER WITH Eco-Mode CONTROL |
| TPS54160QDGQRDL | 制造商:Texas Instruments 功能描述:- Tape and Reel |
| TPS54160QDGQRQ1 | 功能描述:直流/直流開關調節器 Aut Cat 3.5-60V 1.5A Step Down Converter RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關頻率:1.5 MHz 輸出電壓:0.5 V to 0.86 V 輸出電流:4 A 輸出端數量: 最大工作溫度: 安裝風格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5 |
發布緊急采購，3分鐘左右您將得到回復。