- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄69510 > TPS54162QPWPRQ1 (TEXAS INSTRUMENTS INC) 3 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20 PDF資料下載
參數(shù)資料
| 型號： | TPS54162QPWPRQ1 |
| 廠商： | TEXAS INSTRUMENTS INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 3 A SWITCHING REGULATOR, 2200 kHz SWITCHING FREQ-MAX, PDSO20 |
| 封裝： | GREEN, PLASTIC, HTSSOP-20 |
| 文件頁數(shù)： | 9/41頁 |
| 文件大小： | 2414K |
| 代理商： | TPS54162QPWPRQ1 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁當(dāng)前第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
www.ti.com
SLVSA32C – OCTOBER 2009 – REVISED MAY 2010
Enable and Shutdown
The EN pin (pin 5) provides electrical ON/OFF control of the regulator. Once the EN pin voltage exceeds the
upper threshold voltage (VIH), the regulator starts operating and the internal soft start begins to ramp. If the EN
pin voltage is pulled below the lower threshold voltage (VIL), the regulator stops switching and the internal soft
start resets. Connecting this pin to ground or to any voltage less than VIL disables the regulator and causes the
device to shut down. This pin must have an external pullup or pulldown to change the state of the device.
Soft Start
An external soft start capacitor is connected to SS pin (pin 11) to set the minimum time to reach the desired
regulated output voltage (VReg) during power up cycle. This prevents the output voltage from overshooting when
the device is powered up. This is also useful when the load requires a controlled voltage slew rate, and also
helps to limit the current drawn from the input voltage supply line.
For proper operation, the following conditions must be satisfied during power-up and after a short circuit event:
VIN – VReg > 2.5 V
Load current < 1 A, until RSTgoes high
The recommended value of soft start capacitor is 100 nF (typical) for startup load current of 1 A (maximum).
Oscillator Frequency
The oscillator frequency can be set by connecting an external resistor (R8 in Figure 4) to RT pin (pin 6) .
Figure 23 shows the relation between the resistor value (RT) and switching frequency (fsw). The switching
frequency can be set in the range 200 kHz to 2200 kHz. In addition, the switching frequency can be imposed
externally by a clock signal (fext) at the SYNC pin.
Selecting the Switching Frequency
A power supply switching at a higher switching frequency allows use of lower value inductor and smaller output
capacitor compared to a power supply that switches at a lower frequency. Typically, the user will want to choose
the highest switching frequency possible since this will produce the smallest solution size. The switching
frequency that can be selected is limited by the following factors:
The input voltage
The minimum target regulated voltage
Minimum on-time of the internal switching transistor
Frequency shift limitation
Selecting lower switching frequency results in using an inductor and capacitor of a larger value, where as
selecting higher switching frequency results in higher switching and gate drive power losses. Therefore, a
tradeoff has to be made between physical size of the power supply and the power dissipation at the system/
application level.
The minimum and maximum duty cycles can be expressed in terms of input and output voltage as shown in
(6)
Where,
DMin = minimum duty cycle
DMax = maximum duty cycle
VINMin = minimum input voltage
VINMax = maximum input voltage
VReg-Min = minimum regulated output voltage
VReg-Max = maximum regulated output voltage
From Equation 6, maximum switching frequency can be calculated in Equation 7.
(7)
Copyright 2009–2010, Texas Instruments Incorporated
17
Product Folder Link(s): TPS54162-Q1
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TPS5420DR | 5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS5420D | 6.5 A SWITCHING REGULATOR, 600 kHz SWITCHING FREQ-MAX, PDSO8 |
| TPS54226PWP | DUAL SWITCHING CONTROLLER, PDSO20 |
| TPS54226RGTT | DUAL SWITCHING CONTROLLER, PQCC16 |
| TPS54232DR | SWITCHING REGULATOR, 1200 kHz SWITCHING FREQ-MAX, PDSO8 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TPS5420 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:SWIFT Converter Product Portfolio |
| TPS54200DDCR | 功能描述:TPS54200DDCR 制造商:texas instruments 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| TPS54200DDCT | 功能描述:IC REG BUCK 制造商:texas instruments 系列:- 包裝:剪切帶（CT） 零件狀態(tài):在售 功能:降壓 輸出配置:正 拓?fù)?降壓 輸出類型:可調(diào)式 輸出數(shù):1 電壓 - 輸入（最小值）:4.5V 電壓 - 輸入（最大值）:28V 電壓 - 輸出（最小值/固定）:-0.1V 電壓 - 輸出（最大值）:28V 電流 - 輸出:1.5A 頻率 - 開關(guān):600kHz 同步整流器:是 工作溫度:-40°C ~ 125°C （TJ） 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 細(xì)型，TSOT-23-6 供應(yīng)商器件封裝:TSOT-23-6 標(biāo)準(zhǔn)包裝:1 |
| TPS54200EVM-818 | 功能描述:EVALUATION MODULE 制造商:texas instruments 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
| TPS54201DDCR | 功能描述:TPS54201DDCR 制造商:texas instruments 系列:* 零件狀態(tài):在售 標(biāo)準(zhǔn)包裝:1 |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。