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參數(shù)資料
| 型號： | L6599N |
| 廠商： | 意法半導體 |
| 英文描述： | High-voltage resonant controller |
| 中文描述： | 高壓諧振控制器 |
| 文件頁數(shù)： | 25/36頁 |
| 文件大?。?/td> | 591K |
| 代理商： | L6599N |
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L6599
Application information
25/36
The circuit shown in
Figure 30
can be operated in two different ways. If the resistor R
A
in
series to C
A
is small (not above some hundred
, just to limit current spiking) the circuit
operates like a capacitive current divider; C
A
will be typically selected equal to C
R
/100 or
less and will be a low-loss type, the sense resistor R
B
will be selected as:
and C
B
will be such that R
B
·C
B
is in the range of 10 /f
min
.
If the resistor R
A
in series to C
A
is not small (in this case it will be typically selected in the ten
k
), the circuit operates like a divider of the ripple voltage across the resonant capacitor Cr,
which, in turn, is related to its current through the reactance of Cr. Again, C
A
will be typically
selected equal to C
R
/100 or less, this time not necessarily a low-loss type, while R
B
(provided it is << R
A
) according to:
where the reactance of C
A
(X
CA
) and C
R
(X
Cr
) should be calculated at the frequency where
I
Crpk
= I
Crpkx
. Again, C
B
will be such that R
B
·C
B
is in the range of 10 /f
min
.
Whichever circuit one is going to use, the calculated values of R
S
or R
B
should be
considered just a first cut value that needs to be adjusted after experimental verification.
OCP is effective in limiting primary-to-secondary energy flow in case of an overload or an
output short circuit, but the output current through the secondary winding and rectifiers
under these conditions might be so high to endanger converter's safety if continuously
flowing. To prevent any damage during these conditions it is customary to force converter's
intermittent operation, in order to bring the average output current to values such that the
thermal stress for the transformer and the rectifiers can be easily handled.
With the L6599 the designer can program externally the maximum time T
SH
that the
converter is allowed to run overloaded or under short circuit conditions. Overloads or short
circuits lasting less than T
SH
will not cause any other action, hence providing the system
with immunity to short duration phenomena. If, instead, T
SH
is exceeded an overload
protection (OLP) procedure is activated that shuts down the device and, in case of
continuous overload/short circuit, results in continuous intermittent operation with a user-
defined duty cycle.
R
B
π
I
Crpkx
--------------
1
C
r
C
A
-------
+
=
R
B
π
I
Crpkx
--------------
R
2
X
A
2
+
X
C
r
---------------------------
=
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