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A6984 датащи(PDF) 17 Page - STMicroelectronics

номер детали A6984
подробное описание детали  36 V, 400 mA automotive synchronous step-down switching regulator
PDF  47 Pages
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производитель  STMICROELECTRONICS [STMicroelectronics]
домашняя страница  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

A6984 датащи(HTML) 17 Page - STMicroelectronics

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A6984
Device description
47
As a consequence the switching frequency slightly depends on the conversion losses:
Equation 7
where DREAL is the real duty cycle accounting conduction losses:
Equation 8
RON_HS and RON_LS represent the RDSON value of the embedded power elements (see
Table 5 on page 7) and DCR the equivalent series resistor of the selected inductor.
Finally from Equation 7 and Equation 8:
Equation 9
where fSW is the desired switching frequency at a certain IOUT load current level.
Figure 8 shows the estimated fSW variation over the load range assuming the typical
RDSON of the power elements, DCR = 420 m
 (see Section 6 on page 39 for details on the
selected inductor for the reference application board.) and RTON = 1 M.
f
SW IOUT

D
REAL IOUT

T
ON
----------------------------------
=
D
REAL IOUT

V
OUT
R
ON_LS
DCR
+
 I
OUT
+
V
IN
R
ON_LS
R
ON_HS
–
 I
OUT
+
------------------------------------------------------------------------------------
=
R
TON
1
0.9
--------
V
IN
D
REAL IOUT
*

f
SW
C
TON
------------------------------------------------
=



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