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PM6675STR 数据表(PDF) 39 Page - STMicroelectronics

部件名 PM6675STR
功能描述  High efficiency step-down controller with embedded 2 A LDO regulator
PDF  53 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

PM6675STR 数据表(HTML) 39 Page - STMicroelectronics

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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
OSC
V
V
=
α
OUT
SNS
OUT
V
V
=
α
OSC
2
1
2
OSC
OSC
SW
K
1
R
R
R
K
f
⋅
+
=
α
=
Table 10.
Typical values for switching frequency selection
R1 (k
Ω)R2 (kΩ)
Approx switching frequency (kHz)
330
11
250
330
13
300
330
15
350
330
18
400
330
20
450
330
22
500



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