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參數(shù)資料
| 型號(hào)： | L6598D013TR |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | HIGH VOLTAGE RESONANT CONTROLLER |
| 中文描述： | 高壓諧振控制器 |
| 文件頁(yè)數(shù)： | 7/17頁(yè) |
| 文件大?。?/td> | 166K |
| 代理商： | L6598D013TR |
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L6598
During the soft start time the current I
SS
charges the capacitor C
SS
, generating a voltage ramp which is delivered
to a transconductance amplifier, as shown in fig. 7. Thus this voltage signal is converted in a growing current
which is subtracted to I
fstart
. Therefore the current which drives the oscillator to set the frequency during the soft
start is equal to:
[1]
where
[2]
At the start-up (t=0) the oscillator frequency is set by:
[3]
At the end of soft start (t = T
SS
) the second term of eq.1 decreases to zero and the switching frequency is set
only by I
min
(i.e. R
fmin
):
[4]
Since the second term of eq.1 is equal to zero, we have:
[5]
Note that there is not a fixed threshold of the voltage across C
SS
in which the soft start finishes (i.e. the end of
the frequency shifting), and T
SS
depends on C
SS
, I
fstart
, g
m
, and I
SS
(eq. 5). Making T
SS
independent of I
fstart
,
the I
SS
current has been designed to be a fraction of I
fstart
, so:
I
K
g
m
I
fstart
K
[6]
In this way the soft start time depends only on the capacitor C
SS
. The typical value of the k
SS
constant (Soft
Start Timing Constant) is 0.15 s/
μ
F.
The current I
osc
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 C
f
. 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:
[7]
The degree of approximation depends on the frequency value, but it remains very good in the range from 30kHz
to 100kHz (figg.9-13)
I
osc
I
fmin
I
fstart
g
m
V
Css
t
( )
–
(
)
+
I
fmin
I
fstart
g
I
C
ss
--------------
t
–
+
=
=
I
fmin
V
R
fmin
-------------
I
fsart
,
V
R
fstart
----------------
V
REF
,
2V
=
=
=
I
osc
0
( )
I
fmin
I
fstart
+
V
REF
1
R
fmin
-------------
1
R
fstart
----------------
+
=
=
I
osc
T
ss
(
)
I
fmin
V
R
fmin
-------------
=
=
I
fstart
g
I
C
ss
--------------
T
SS
–
0
T
SS
→
C
I
g
m
I
ss
-----------------------
=
=
I
SS
-------------
T
SS
→
-------------------------
T
SS
→
C
g
m
K
-----------
T
SS
k
SS
C
SS
–
→
=
=
=
f
min
1.41
R
fmin
C
f
--------------------
=
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