參數(shù)資料
型號(hào)： PM6675STR
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： 3 A SWITCHING CONTROLLER, QCC24
封裝： 4 X 4 MM, LEAD FREE, VFQFPN-24
文件頁(yè)數(shù)： 33/53頁(yè)
文件大?。?/td> 2632K
代理商： PM6675STR
PM6675S
Application information
39/53
where
Equation 28a
Equation 28b
Referring to the typical application schematic (figure in cover page and Figure 33), 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 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.
IN
OSC
V
=
α
OUT
SNS
OUT
V
=
α
OSC
2
1
2
OSC
SW
K
1
R
K
f
+
=
α
=
Table 10.
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
相關(guān)PDF資料
PDF描述
PM6675S 3 A SWITCHING CONTROLLER, QCC24
PM6681ATR 0.4 A DUAL SWITCHING CONTROLLER, QCC32
PMA4118HSF/C 1-OUTPUT 18 W DC-DC REG PWR SUPPLY MODULE
PMA4118LSF/B 1-OUTPUT 14.4 W DC-DC REG PWR SUPPLY MODULE
PMA4218GSF/B 1-OUTPUT 21.6 W DC-DC REG PWR SUPPLY MODULE
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