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L6599 bảng dữ liệu(PDF) 22 Page - STMicroelectronics

tên linh kiện L6599
Giải thích chi tiết về linh kiện  High-voltage resonant controller
PDF  36 Pages
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nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
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L6599 bảng dữ liệu(HTML) 22 Page - STMicroelectronics

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Application information
L6599
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Figure 28. Power vs frequency curve in an resonant half-bridge
As a result, the average input current will smoothly increase, without the peaking that occurs
with linear frequency sweep, and the output voltage will reach the regulated value with
almost no overshoot.
Typically, RSS and CSS will be selected based on the following relationships:
where fstart is recommended to be at least 4 times fmin. The proposed criterion for CSS is
quite empirical and is a compromise between an effective soft-start action and an effective
OCP (see next section). Please refer to the timing diagram of Figure 31 to see some
significant signals during the soft-start phase.
RESONANCE
FREQUENCY
f
| Z ( f ) | -1
Initial
frequency
Steady-state
frequency
R
SS
RF
min
f
start
f
min
------------
1
–
----------------------
=
C
ss
310
3
–
⋅
R
SS
----------------------
=



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