參數(shù)資料
型號(hào)： L6566BTR
廠商： STMICROELECTRONICS
元件分類： 穩(wěn)壓器
英文描述： 0.8 A POWER FACTOR CONTROLLER, 900 kHz SWITCHING FREQ-MAX, PDSO16
封裝： LEAD FREE, SOP-16
文件頁(yè)數(shù)： 17/51頁(yè)
文件大?。?/td> 624K
代理商： L6566BTR
Application information
L6566B
24/51
5.3
Burst-mode operation at no load or very light load
When the voltage at the COMP pin (9) falls 20 mV below a threshold fixed internally at a
value, VCOMPBM, depending on the selected operating mode, the L6566B is disabled with
the MOSFET kept in OFF state and its consumption reduced at a lower value to minimize
Vcc capacitor discharge.
The control voltage now will increase as a result of the feedback reaction to the energy
delivery stop (the output voltage will be slowly decaying), the threshold will be exceeded and
the device will restart switching again. In this way the converter will work in burst-mode with
a nearly constant peak current defined by the internal disable level. A load decrease will
then cause a frequency reduction, which can go down even to few hundred hertz, thus
minimizing all frequency-related losses and making it easier to comply with energy saving
regulations. This kind of operation, shown in the timing diagrams of Figure 11 along with the
others previously described, is noise-free since the peak current is low.
If it is necessary to decrease the intervention threshold of the burst-mode operation, this can
be done by adding a small DC offset on the current sense pin as shown in Figure 12 on
.
Note:
The offset reduces the available dynamics of the current signal; thereby, the value of the
sense resistor must be determined taking this offset into account.
Figure 11.
Load-dependent operating modes: timing diagrams
GD
(pin 4)
VCOMPBM
t
COMP
(pin 9)
20 mV
hyster.
QR Mode
Valley-skipping Mode
Burst-mode
fsw
fosc
QR Mode
FF Mode
Burst-mode
FF Mode
MODE/SC=Open
MODE/SC=VREF
MODE/SC=Open
MODE/SC=VREF
相關(guān)PDF資料
PDF描述
L6706 SWITCHING REGULATOR, QCC40
L6717 DUAL SWITCHING CONTROLLER, 575 kHz SWITCHING FREQ-MAX, QCC48
L6728HTR SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10
L6728H SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, PDSO10
L6728 1.5 A SWITCHING CONTROLLER, 330 kHz SWITCHING FREQ-MAX, DSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
L6566BTR-CUT TAPE 制造商:ST 功能描述:L6566B Series 23 V 4.6 mA SMPS Multi-Mode Controller Surface Mount - SOIC-16N
L6567 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:HIGH VOLTAGE DRIVER FOR CFL
L6567D 制造商:STMicroelectronics 功能描述:CFL DRVR 18V 14SOP - Rail/Tube
L6569 功能描述:功率驅(qū)動(dòng)器IC Hi-Volt Half Bridge RoHS:否 制造商:Micrel 產(chǎn)品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時(shí)間: 下降時(shí)間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube
L6569 制造商:STMicroelectronics 功能描述:IC HALF BRIDGE+OSC 6569 DIP8
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

*
*
*