參數(shù)資料
型號: L6599D
廠商: STMICROELECTRONICS
元件分類: 穩(wěn)壓器
英文描述: 0.8 A SWITCHING CONTROLLER, 500 kHz SWITCHING FREQ-MAX, PDSO16
封裝: LEAD FREE, SOP-16
文件頁數(shù): 15/36頁
文件大?。?/td> 636K
代理商: L6599D
Application information
L6599
22/36
Figure 29. 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 32 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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