參數(shù)資料
型號： TPS40077PWPRG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： 2 A SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： GREEN, PLASTIC, HTSSOP-16
文件頁數(shù)： 6/43頁
文件大?。?/td> 847K
代理商： TPS40077PWPRG4
APPLICATION INFORMATION
MINIMUM PULSE DURATION
SLEW RATE LIMIT ON VDD
15
9
16
13
12
10
ILIM
HDRV
SW
LDRV
VDD
PGND
TPS40077
C
R
VIN
S0203-01
+
_
SLUS714D – JANUARY 2007 – REVISED APRIL 2009 ..................................................................................................................................................... www.ti.com
The TPS40077 allows the user to construct synchronous voltage-mode buck converters with inputs ranging from
4.5 V to 28 V and outputs as low as 700 mV. Predictive Gate Drive circuitry optimizes switching delays for
increased efficiency and improved converter output-power capability. Voltage feed-forward is employed to ease
loop compensation for wide-input-range designs and provide better line transient response.
The TPS40077 incorporates circuitry to allow startup into a preexisting output voltage without sinking current
from the source of the preexisting output voltage. This avoids damaging sensitive loads at start-up. An integrated
power-good indicator is available for logic (open-drain) output of the condition of the output of the converter.
The TPS40077 devices have limitations on the minimum pulse duration that can be used to design a converter.
Reliable operation is assured for nominal pulse durations of 150 ns and above. This places some restrictions on
the conversion ratio that can be achieved at a given switching frequency. Figure 14 shows minimum output
voltage for a given input voltage and frequency.
The regulator that supplies power for the drivers on the TPS40077 requires a limited rising slew rate on VDD for
proper operation if the input voltage is above 10 V. If the slew rate is too great, this regulator can overshoot and
damage to the part can occur. To ensure that the part operates properly, limit the slew rate to no more than
0.12 V/
s as the voltage at VDD crosses 8 V. If necessary, an R-C filter can be used on the VDD pin of the
device. Connect the resistor from the VDD pin to the input supply of the converter. Connect the capacitor from
the VDD pin to PGND. There should not be excessive (more than a 200-mV) voltage drop across the resistor in
normal operation. This places some constraints on the R-C values that can be used. Figure 22 is a schematic
fragment that shows the connection of the R-C slew rate limit circuit. Equation 1 and Equation 2 give values for R
and C that limit the slew rate in the worst-case condition.
Figure 22. Limiting the Slew Rate
14
Copyright 2007–2009, Texas Instruments Incorporated
Product Folder Link(s) :TPS40077
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40090 制造商:TI 制造商全稱:Texas Instruments 功能描述:HIGH FREQUENCY MULTIPHASE CONTROLLER
TPS40090EVM-001 功能描述:電源管理IC開發(fā)工具 TPS40090-001 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)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
TPS40090EVM-002 功能描述:電源管理IC開發(fā)工具 TPS40090-002 Eval Mod RoHS:否 制造商:Maxim Integrated 產(chǎn)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
TPS40090PW 功能描述:DC/DC 開關(guān)控制器 4 Ch Multiphase Buck DC/DC Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關(guān)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(fēng)格: 封裝 / 箱體:CPAK
TPS40090PW 制造商:Texas Instruments 功能描述:CONTROLLER IC
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