參數(shù)資料
型號(hào)： L6599TR
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)： 21/36頁(yè)
文件大?。?/td> 591K
代理商： L6599TR
L6599
Application information
21/36
7.3
Soft-start
Generally speaking, purpose of soft-start is to progressively increase converter's power
capability when it is started up, so as to avoid excessive inrush current. In resonant
converters the deliverable power depends inversely on frequency, then soft- start is done by
sweeping the operating frequency from an initial high value until the control loop takes over.
With the L6599 converter's soft start-up is simply realized with the addition of an R-C series
circuit from pin 4 (RF
min
) to ground (see
Figure 27
).
Initially, the capacitor C
SS
is totally discharged, so that the series resistor R
SS
is effectively
in parallel to RF
min
and the resulting initial frequency is determined by R
SS
and RF
min
only,
since the optocoupler's phototransistor is cut off (as long as the output voltage is not too far
away from the regulated value):
The C
SS
capacitor is progressively charged until its voltage reaches the reference voltage
(2V) and, consequently, the current through R
SS
goes to zero. This conventionally takes 5
time constants R
SS
·C
SS
but, before that time, the output voltage will have got close to the
regulated value and the feedback loop taken over, so that it will be the optocoupler's
phototransistor to determine the operating frequency from that moment onwards.
During this frequency sweep phase the operating frequency will decay following the
exponential charge of C
SS
, that is, initially it will change relatively quickly but the rate of
change will get slower and slower. This counteracts the non-linear frequency dependence
of the tank circuit that makes converter's power capability change little as frequency is away
from resonance and change very quickly as frequency approaches resonance frequency
(see
Figure 28
).
Figure 27. Soft-start circuit
f
start
3
CF
R F
min
R
SS
)
(
)
------------------------------------------------------------------------
=
L6599
Css
4
1
RFmin
R
Fmin
R
SS
C
SS
| Z ( f ) |
相關(guān)PDF資料
PDF描述
L6701 3 Phase Controller for VR10, VR9 and K8 CPUs
L6701TR 3 Phase Controller for VR10, VR9 and K8 CPUs
L6711 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs
L6711TR 3 PHASE CONTROLLER WITH DYNAMIC VID AND SELECTABLE DACs
L6714 4 phase controller with embedded drivers for Intel VR10, VR11 and AMD 6Bit CPUs
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L65B 制造商:Electro-Mech 功能描述:
L65B3C881-00000-000 制造商:Carling Technologies 功能描述:L-SERIES ROCKER SWITCH - Bulk
L65D1CNN1-00000-000 制造商:Carling Technologies 功能描述:L-SERIES ROCKER SWITCH - Bulk
L65D1S001-AZZ00-000 制造商:Carling Technologies 功能描述:L-SERIES ROCKER SWITCH - Bulk
L65E1AC01-A9Z00-000 制造商:Carling Technologies 功能描述:L-SERIES ROCKER SWITCH - Bulk
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。

采購(gòu)需求

(若只采購(gòu)一條型號(hào)，填寫(xiě)一行即可)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

發(fā)布成功！您可以繼續(xù)發(fā)布采購(gòu)。也可以進(jìn)入我的后臺(tái)，查看報(bào)價(jià)

*型號(hào) *數(shù)量 廠商 批號(hào) 封裝
添加更多采購(gòu)

我的聯(lián)系方式

*
*
*