參數(shù)資料
型號(hào)： LTC3766IUFD#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28
封裝： 4 X 5 MM, LEAD FREE, PLASTIC, MO-220, QFN-28
文件頁(yè)數(shù)： 35/60頁(yè)
文件大?。?/td> 607K
代理商： LTC3766IUFD#TRPBF
LTC3766
40
3766f
APPLICATIONS INFORMATION
The buck bias winding can also be used standalone
without the peak charge supply, as shown in Figure 25.
This is sometimes done in applications where the peak
charge circuit is impractical, such when the VIN voltage
has a wide range.
When using the buck bias supply standalone, particular
care must be taken to ensure that the bias output comes
up more quickly than the main output, and that there is
adequate bias voltage immediately after control hand-
off. This is made more difficult by the presence of some
load on the VCC pin during start-up whereas there may
be no load on the main output. In general, a clean start-
up with a standalone buck bias supply can be achieved
by observing the following guidelines: 1) set the turns
ratio of the auxiliary winding so that the operating VAUX
will be at least 3V above the rising VCC UVLO voltage,
2) use a smaller value for LBK, typically one-half of that
calculated in the above equation, but always large enough
for continuous current in LBK during normal operation
3) use the high-voltage linear regulator to minimize the
load on VCC during start-up, 4) use the RUN pin to monitor
the bias voltage and set the start-up voltage to 2V above
the rising VCC UVLO voltage with a hysteresis of 1.5V, 5)
use a shorter soft-start time, less than 10ms if possible,
6) use a small VCC capacitor (typically CVCC = 0.22μF) and
a capacitor CBK given by:
CBK =
20 QGPRIfSW +3mA
(
)NPT +18mA
fSWVHYST
where VHYST is the hysteresis set by the RUN pin (1.5V).
Note that this value for CBK is as small as possible so that
VBUCK rises quickly, but large enough to support the bias
current until control is handed off to the secondary and
the duty cycle increases. Once control is handed off, both
the buck supply and the main converter will be operating
in continuous current mode, so their outputs will track.
Anotherhighefficiencyoptionforgeneratingbiasistomake
use of an inductor overwinding, as shown in Figure26.
This supply is created by adding a second winding on the
main output inductor.
During the on-time of the synchronous MOSFET, the VOUT
voltageisscaledandcoupledthroughdiodeDOWtocapaci-
tor COW, so that the resulting bias voltage is:
VOW = VOUT
NL2
NL1
– 0.5
This is similar to the buck supply in that it is highly efficient
and fairly well regulated. However, it is simpler in that it
does not require the use of an additional inductor to gener-
ate the bias voltage. Another advantage of this technique
is that the bias voltage always tracks VOUT, so there is
no concern about the bias voltage potentially lagging the
output voltage during start-up. Like the buck bias supply,
the inductor overwinding can be used either stand alone
(as shown in Figure 26) or together with a peak charge
bias supply. Use a schottky diode DOW with a peak surge
current rating of 5A or higher. Capacitor COW should be a
ceramic capacitor with a value of 2.2μF or greater.
VIN
VBUCK
RUN
RR2
DBK
LBK
CVCC
NDRV
LTC3766
VCC
RR1
CBK
Q1
3766 F25
NP
NAUX
MAIN
XFMR
Figure 25. Using the Buck Bias Supply Standalone
VIN
VAUX
NDRV
LTC3766
VCC
CVCC
3766 F26
COW
DOW
NL2
SW
MAIN
XFMR
NL1
NS
NP
VOW
COUT
VOUT
Figure 26. Inductor Overwinding Bias Supply
相關(guān)PDF資料
PDF描述
LTC3766MPUFD#TRPBF SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28
LTC3766IGN#TRPBF SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PDSO28
LTC3766MPUFD#PBF SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28
LTC3766EUFD#PBF SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28
LTC3805EDD SWITCHING CONTROLLER, 700 kHz SWITCHING FREQ-MAX, PDSO10
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3766MPGN#PBF 功能描述:IC CONTROLLER SYNCH 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC3766MPGN#TRPBF 功能描述:IC CONTROLLER SYNCH 28SSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC3766MPUFD#PBF 功能描述:IC CONTROLLER SYNCH 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC3766MPUFD#TRPBF 功能描述:IC CONTROLLER SYNCH 28QFN RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™, PolyPhase® 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:2,500 系列:- 應(yīng)用:多相控制器 輸入電壓:- 電源電壓:9 V ~ 14 V 電流 - 電源:- 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:40-WFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR)
LTC3770EG 制造商:Linear Technology 功能描述:LDO Cntrlr SYNC BUCK REG 0.6V to 32V 28-Pin SSOP
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

*
*
*