參數(shù)資料
型號(hào)： L6591TR
廠商： STMICROELECTRONICS
元件分類(lèi)： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, PDSO16
封裝： ROHS COMPLIANT, SOP-16
文件頁(yè)數(shù)： 8/32頁(yè)
文件大?。?/td> 560K
代理商： L6591TR
Application information
L6591
16/32
Doc ID 14821 Rev 4
Figure 8.
Load-dependent operating modes: timing diagram
Figure 9.
Addition of an offset to the current sense lowers the burst-mode
operation threshold
To help the designer meet energy saving requirements even in power-factor-corrected
systems, where a PFC pre-regulator precedes the DC-DC converter, the L6591 allows that
the PFC pre-regulator can be turned off during burst-mode operation, hence eliminating the
no-load consumption of this stage (0.5
÷1 W). There is no compliance issue in that because
EMC regulations on low-frequency harmonic emissions refer to nominal load, no limit is
envisaged when the converter operates with light or no load.
To do so, the L6591 provides the PFC_STOP (#8) pin: it is an open collector output,
normally open, that is asserted low when the IC is idle during burst-mode operation. This
signal will be externally used for switching off the PFC controller and the pre-regulator as
shown in Figure 10. When the L6591 is in UVLO the pin is kept open, to let the PFC
controller starts first.
LVG, HVG
1.82V
t
COMP
Fi x. Fr eq. M ode
Burst-mode
fosc
Fi x. Freq. Mode
PFC_STOP
PFC
GATE-DR IVE
1.75V
Rs
L6591
R
Vref
Rc
6
10
4
11
Vo = Vref
R
R + Rc
LVG
ISEN
GND
Rs
L6591
R
Vref
Rc
6
10
4
11
Vo = Vref
R
R + Rc
LVG
ISEN
GND
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相關(guān)代理商/技術(shù)參數(shù)
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L6598D013TR 功能描述:PMIC 解決方案 High Volt Reson Cont RoHS:否 制造商:Texas Instruments 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-24 封裝:Reel
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