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參數(shù)資料
| 型號(hào)： | ISL6441 |
| 廠(chǎng)商： | Intersil Corporation |
| 英文描述： | 1.4MHz Dual, Out-of-Phase, Step-Down PWM and Single Linear Controller(1.4MHz兩路,異相，降壓型PWM，外加一路線(xiàn)性控制器) |
| 中文描述： | 1.4MHz的雙通道，外的階段，降壓型PWM和線(xiàn)性控制器單（1.4MHz的兩路，異相，降壓型脈寬調(diào)制，外加一路線(xiàn)性控制器） |
| 文件頁(yè)數(shù)： | 17/18頁(yè) |
| 文件大小： | 380K |
| 代理商： | ISL6441 |
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FN9197.1
October 4, 2005
Output Inductor Selection
The PWM converters require output inductors. The output
inductor is selected to meet the output voltage ripple
requirements. The inductor value determines the converter’s
ripple current and the ripple voltage is a function of the ripple
current and output capacitor(s) ESR. The ripple voltage
expression is given in the capacitor selection section and the
ripple current is approximated by the following equation:
For the ISL6441, Inductor values between 1
μ
H to 3.3
μ
H is
recommended when using the Typical Application
Schematic. Other values can be used but a more rigorous
stability analysis should be done.
Input Capacitor Selection
The important parameters for the bulk input capacitor(s) are
the voltage rating and the RMS current rating. For reliable
operation, select bulk input capacitors with voltage and
current ratings above the maximum input voltage and largest
RMS current required by the circuit. The capacitor voltage
rating should be at least 1.25 times greater than the
maximum input voltage and 1.5 times is a conservative
guideline. The AC RMS Input current varies with the load.
The total RMS current supplied by the input capacitance is:
where,
DC is duty cycle of the respective PWM.
Depending on the specifics of the input power and its
impedance, most (or all) of this current is supplied by the
input capacitor(s). Figure 22 shows the advantage of having
the PWM converters operating out of phase. If the
converters were operating in phase, the combined RMS
current would be the algebraic sum, which is a much larger
value as shown. The combined out-of-phase current is the
square root of the sum of the square of the individual
reflected currents and is significantly less than the combined
in-phase current.
Use a mix of input bypass capacitors to control the voltage
ripple across the MOSFETs. Use ceramic capacitors for the
high frequency decoupling and bulk capacitors to supply the
RMS current. Small ceramic capacitors can be placed very
close to the upper MOSFET to suppress the voltage induced
in the parasitic circuit impedances.
For board designs that allow through-hole components, the
Sanyo OS-CON series offer low ESR and good
temperature performance. For surface mount designs, solid
tantalum capacitors can be used, but caution must be
exercised with regard to the capacitor surge current rating.
These capacitors must be capable of handling the surge-
current at power-up. The TPS series available from AVX is
surge current tested.
I
L
V
------------–
V
f
S
(
)
V
OUT
)
(
)
(
)
L
( )
V
IN
(
=
I
RMS
I
RMS1
2
I
RMS2
2
+
=
I
RMSx
DC
DC
2
–
=
FIGURE 22. INPUT RMS CURRENT vs LOAD
1
2
3
4
5
3.3V AND 5V LOAD CURRENT
I
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
0
IN PHASE
OUT OF PHASE
5V
3.3V
ISL6441
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| ISL6443(中文) | 300kHz Dual, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller(兩路300kHz，180°異相，降壓PWM外加一路線(xiàn)性控制器) |
| ISL6443 | 300kHz Dual, 180° Out-of-Phase, Step-Down PWM and Single Linear Controller(兩路300kHz，180°異相，降壓PWM外加一路線(xiàn)性控制器) |
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| ISL6445 | 1.4MHz Dual, 180 Degree Out-of-Phase, Step-Down PWM Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
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| ISL6441IR | 功能描述:IC CTRLR SGL/STEP DOWN PWM 28QFN RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL6441IR-T | 功能描述:IC CTRLR PWM DUAL 1.4MHZ 28-QFN RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL6441IR-TK | 功能描述:IC CTRLR PWM DUAL 1.4MHZ 28-QFN RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:- 應(yīng)用說(shuō)明:Ultrasound Imaging Systems Application Note 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:37 系列:- 應(yīng)用:醫(yī)療用超聲波成像，聲納 電流 - 電源:- 電源電壓:2.37 V ~ 6 V 工作溫度:0°C ~ 70°C 安裝類(lèi)型:表面貼裝 封裝/外殼:56-WFQFN 裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:56-TQFN-EP（8x8） 包裝:管件 |
| ISL6441IRZ | 功能描述:IC CTRLR SGL/STEP DOWN PWM 28QFN RoHS:是 類(lèi)別:集成電路 (IC) >> PMIC - 電源管理 - 專(zhuān)用 系列:- 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:50 系列:- 應(yīng)用:熱電冷卻器 電流 - 電源:- 電源電壓:3 V ~ 5.5 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)型:表面貼裝 封裝/外殼:28-SOIC（0.173"，4.40mm 寬）裸露焊盤(pán) 供應(yīng)商設(shè)備封裝:28-TSSOP 裸露焊盤(pán) 包裝:管件 產(chǎn)品目錄頁(yè)面:1410 (CN2011-ZH PDF) |
| ISL6441IRZS2695 | 制造商:Intersil Corporation 功能描述: |
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