參數(shù)資料
型號(hào)： L6598
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP16
封裝： DIP-16
文件頁(yè)數(shù)： 2/24頁(yè)
文件大?。?/td> 359K
代理商： L6598
Block diagram description
L6598
10/24
Doc ID 6554 Rev 7
At the start-up (t = 0) the oscillator frequency is set by:
Equation 3
At the end of soft start (t = TSS) the second term of eq.1 decreases to zero and the switching
frequency is set only by Imin (i.e. Rfmin):
Equation 4
Since the second term of eq.1 is equal to zero, we have:
Equation 5
Note that there is not a fixed threshold of the voltage across CSS in which the soft start
finishes (i.e. the end of the frequency shifting), and TSS depends on CSS, Ifstart, gm, and ISS
(eq. 5). Making TSS independent of Ifstart, the ISS current has been designed to be a fraction
of Ifstart, so:
Equation 6
In this way the soft start time depends only on the capacitor CSS. The typical value of the kSS
constant (Soft start timing constant) is 0.15 s/
μF.
The current Iosc is fed to the oscillator as shown in fig. 7. It is twice mirrored (x4 and x8)
generating the triangular wave on the oscillator capacitor Cf. Referring to the internal
structure of the oscillator (fig.7), a good relationship to compute an approximate value of the
oscillator frequency in normal operation is:
Equation 7
I
OSC 0
() I
fmin
I
fstart
+
V
REF
1
R
fmin
--------------
1
R
fstart
----------------
+
=
I
OSC TSS
() I
fmin
V
REF
R
fmin
--------------
=
I
fstart
g
mIss
C
ss
--------------T
SS
–
0T
SS
C
ssIfstart
g
mIss
------------------------
=
→
=
I
SS
I
fstart
K
--------------
T
SS
C
ssIfstart
g
mIfstartK
--------------------------
T
SS
→
=
→
C
ss
g
mK
-----------
T
SS
k
SSCSS
–
→
==
f
min
1.41
R
fminCf
--------------------
=
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