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A6985F датащи(PDF) 55 Page - STMicroelectronics

номер детали A6985F
подробное описание детали  38 V 500 mA synchronous step-down switching regulator
PDF  77 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
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A6985F датащи(HTML) 55 Page - STMicroelectronics

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A6985F
Application notes
77
For example with VOUT = 3.3 V, VIN = 12 V, IL = 0.25 A, fSW = 2 MHz (resulting by the
inductor value) and COUT = 10 F MLCC:
Equation 54
The output capacitor value has a key role to sustain the output voltage during a steep load
transient. When the load transient slew rate exceeds the system bandwidth, the output
capacitor provides the current to the load. In case the final application specifies high slew
rate load transient, the system bandwidth must be maximized and the output capacitor has
to sustain the output voltage for time response shorter than the loop response time.
In Table 15 some capacitor series are listed.
Table 15. Output capacitors
Manufacturer
Series
Cap value (
F)
Rated voltage (V)
ESR (m
)
MURATA
GRM32
22 to 100
6.3 to 25
< 5
GRM31
10 to 47
6.3 to 25
< 5
PANASONIC
ECJ
10 to 22
6.3
< 5
EEFCD
10 to 68
6.3
15 to 55
SANYO
TPA/B/C
100 to 470
4 to 16
40 to 80
TDK
C3225
22 to 100
6.3
< 5
V
OUT
VOUT
------------------
1
VOUT
--------------
I
LMAX
COUT fSW
------------------------------
1
3.3
--------
0·25
810
F2MHz
----------------------------------------------



1·6mV
3.3
-------------------
0.05%
==
=



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