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參數(shù)資料
| 型號： | PM6675TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, QCC24 |
| 封裝： | 4 X 4 MM, VFQFPN-24 |
| 文件頁數(shù)： | 27/50頁 |
| 文件大?。?/td> | 782K |
| 代理商： | PM6675TR |
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PM6675
Application information
33/47
where
Equation 28a
Equation 28b
Referring to the typical application schematic (figure in cover page and Figure 5), the final
expression is then:
Equation 29
The switching frequency directly affects two parameters:
●
Inductor size: greater frequencies mean smaller inductances. In notebook applications,
real estate solutions (i.e. low-profile power inductors) are mandatory also with high
saturation and r.m.s. currents.
●
Efficiency: switching losses are proportional to the frequency. Generally, higher
frequencies imply lower efficiency.
Even if the switching frequency is theoretically independent from battery and output
voltages, parasitic parameters involved in power path (like MOSFETs' on-resistance and
inductor's DCR) introduce voltage drops responsible for a slight dependence on load
current.
In addition, the internal delay is cause of a light dependence from input voltage.
Table 8. Typical values for switching frequency selection
R1 (k
)R2 (k)
Approx switching frequency (kHz)
330
11
250
330
13
300
330
15
350
330
18
400
330
20
450
330
22
500
IN
OSC
V
=
α
OUT
SNS
OUT
V
=
α
OSC
2
1
2
OSC
SW
K
1
R
K
f
+
=
α
=
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相關代理商/技術參數(shù) |
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| PM6680_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:No Rsense dual step-down controller with adjustable voltages for notebook system power |
| PM6680A | 功能描述:DC/DC 開關控制器 Dual sync controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 |
| PM6680ATR | 功能描述:DC/DC 開關控制器 Dual sync controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 |
| PM6680TR | 功能描述:DC/DC 開關控制器 No Rsense dual StepDwn Controller RoHS:否 制造商:Texas Instruments 輸入電壓:6 V to 100 V 開關頻率: 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 |
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