參數(shù)資料
型號： TPS40055MPWPREPG4
廠商： TEXAS INSTRUMENTS INC
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO16
封裝： PLASTIC, HTSSOP-16
文件頁數(shù)： 17/35頁
文件大?。?/td> 2348K
代理商： TPS40055MPWPREPG4
SGLS310B – JULY 2005 – REVISED OCTOBER 2010
www.ti.com
8. Programming the ramp generator circuit
The PWM ramp is programmed through a resistor (RKFF) from the KFF pin to VIN. The ramp generator also
controls the input UVLO voltage. For an undervoltage level of 10 V, RKFF can be calculated from Equation 64.
(64)
9. Calculating the output capacitance (CO)
In this example the output capacitance is determined by the load response requirement of
ΔV = 0.3 V for a 1-A
to 8-A step load. CO can be calculated using Equation 65.
(65)
Using Equation 66, we can calculate the ESR required to meet the output ripple requirements.
(66)
(67)
For this design example, two Panasonic SP EEFUEOJ1B1R capacitors, (6.3 V, 180 F, 12 m
) are used.
10. Calculate the soft-start capacitor (CSS)
This design requires a soft-start time (tSTART) of 1 ms. CSS can be calculated on Equation 68
(68)
11. Calculate the current limit resistor (RILIM)
The current limit set point depends on tSTART, VO, CO, and ILOAD at start-up as shown in Equation 69. For this
design,
(69)
For this design, set ILIM for 11 ADC minimum. From Equation 70, with IOC equal to the dc-output surge current
plus one-half the ripple current of 3.2 A and RDS(on) is increased 30% (1.3 × 0.008) to allow for MOSFET heating.
(70)
12. Calculate loop compensation values
Calculate the dc modulator gain (AMOD) from Equation 71
(71)
Calculate the output filter L-CO poles and CO ESR zeros from Equation 72 and Equation 73
(72)
and
24
Copyright 2005–2010, Texas Instruments Incorporated
Product Folder Link(s): TPS40055-EP
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TPS40055PWP 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink 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 安裝風格: 封裝 / 箱體:CPAK
TPS40055PWPG4 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink 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 安裝風格: 封裝 / 箱體:CPAK
TPS40055PWPR 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink 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 安裝風格: 封裝 / 箱體:CPAK
TPS40055PWPRG4 功能描述:DC/DC 開關(guān)控制器 Wide Input Sync Buck Cntrlr source/sink 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 安裝風格: 封裝 / 箱體:CPAK
TPS40056 制造商:TI 制造商全稱:Texas Instruments 功能描述:WIDE-INPUT SYNCHRONOUS, TRACKING BUCK CONTROLLER
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