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参数资料
| 型号： | L6598 |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 稳压器 |
| 英文描述： | SWITCHING CONTROLLER, 400 kHz SWITCHING FREQ-MAX, PDIP16 |
| 封装： | DIP-16 |
| 文件页数： | 2/24页 |
| 文件大小： | 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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| L6598D013TR | 功能描述:PMIC 解决方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安装风格:SMD/SMT 封装 / 箱体:QFN-24 封装:Reel |
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