參數(shù)資料
型號(hào)： PM6641
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING REGULATOR, 1100 kHz SWITCHING FREQ-MAX, QCC48
封裝： 7 X 7 MM, 1 MM HEIGHT, LEAD FREE, VQFP-48
文件頁(yè)數(shù)： 30/47頁(yè)
文件大?。?/td> 2254K
代理商： PM6641
Components selection
PM6641
36/47
Doc ID 13510 Rev 3
Once the inductor value is determined, the inductor current ripple is then recalculated:
Equation 13
The next step is the computation of the maximum RMS inductor current:
Equation 14
The inductor must have an RMS current greater than IL,RMS in order to assure thermal
stability.
Then the calculation of the maximum inductor peak current follows:
Equation 15
IL,PEAK is important when choosing the inductor, in term of its saturation current.
The saturation current of the inductor should be greater than the maximum between ILpeak
and the programmed peak current limit, selected by an external resistor connected between
CSNS pin and AGND (as described in current limit section).
8.2
Input capacitor selection
In a buck topology converter the current that flows through the input capacitor is pulsed and
with zero average value. The RMS input current, for each switching regulator, can be
calculated as follows:
Equation 16
Neglecting the second term, the equation is reduced to:
Equation 17
MAX
,
IN
OUT
MAX
,
IN
MAX
,
L
V
L
fsw
V
I
=
Δ
12
)
I
(
)
I
(
I
2
MAX
,
L
2
MAX
,
LOAD
RMS
,
L
Δ
+
=
2
I
MAX
,
L
MAX
,
LOAD
PEAK
,
L
Δ
+
=
2
L
2
LOAD
RMS
Cin
)
I
(
D
12
1
)
D
1
(
D
I
Δ
+
=
)
D
1
(
D
I
LOAD
RMS
Cin
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
PM6641TR 功能描述:低壓差穩(wěn)壓器 - LDO Monolithic VR RoHS:否 制造商:Texas Instruments 最大輸入電壓:36 V 輸出電壓:1.4 V to 20.5 V 回動(dòng)電壓（最大值）:307 mV 輸出電流:1 A 負(fù)載調(diào)節(jié):0.3 % 輸出端數(shù)量: 輸出類型:Fixed 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VQFN-20
PM6644 功能描述:直流/直流開關(guān)調(diào)節(jié)器 350mA adjust SD reg 4.5V to 25V 350mA RoHS:否 制造商:International Rectifier 最大輸入電壓:21 V 開關(guān)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(shù)量: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:PQFN 4 x 5
PM6644TR 功能描述:DC/DC 開關(guān)控制器 350 mA adj step-down 4.5 to 25V -40, 150c 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
PM6650 制造商:Qualcomm 功能描述:Electronic Component
PM6652 功能描述:DC/DC 開關(guān)控制器 Single Phase CNTR Intel MVP 6.5 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
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