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參數(shù)資料
| 型號： | LTC3766IGN#PBF |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PDSO28 |
| 封裝： | 0.150 INCH, LEAD FREE, PLASTIC, SSOP-28 |
| 文件頁數(shù)： | 36/60頁 |
| 文件大?。?/td> | 607K |
| 代理商： | LTC3766IGN#PBF |
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LTC3766
41
3766f
APPLICATIONS INFORMATION
A useful variant of the inductor over-winding bias supply
is shown in Figure 27, where a discrete transformer TOW
has been used instead of an additional winding on the
main inductor LF. This is often more convenient because
standard parts can readily be used.
In the circuit of Figure 27, a second diode DOW2 has been
added to prevent DC bias current from being carried in
the transformer TOW. This transformer can be either a
gate-drive or flyback-style transformer, which are widely
available in a range of turns ratios. Note that transformer
TOWrequiresonlyfunctionalisolationandcanbephysically
very small. This circuit produces a bias voltage given by:
VOW = VOUT –0.5
(
)NL2
NL1
– 0.5
Duringanoutputoverloadcondition,thevoltagegenerated
by a either a buck supply or inductor overwinding sup-
ply will drop as the converter output voltage decreases.
If this happens and there is no peak charge bias supply,
then the LTC3766 will have a UVLO fault that will cause
both the LTC3765 and LTC3766 to shut down and attempt
a restart. If a peak charge supply is used together with a
buckorinductoroverwindingsupply,thentheLTC3766will
automatically re-energize the high voltage linear regulator
when the VAUX pin gets too low. If continuous operation of
the peak charge and high voltage regulator is not needed,
then the REGSD pin can be used to limit the total time that
this regulator is allowed to operate (shown as an option
in Figures 23 and 24). This enables a low power pass
transistor to be used. See Linear Regulator Operation for
more information on using the REGSD feature.
Soft-Start Ramp Time and Control Hand-Off
The soft-start ramp time on the LTC3766 is set by placing a
capacitorbetweentheSSpinandGND.Thissecondary-side
soft-start capacitor only controls the output voltage ramp
after control hand-off has taken place. Consequently, its
effect on the overall output voltage start-up will depend on
the primary to secondary hand-off voltage in the particular
application. Choose a soft-start capacitor using:
CSS =
5A
( )tSS
1.83 0.6 – VFB(HO)
(
)
where tSS is the soft-start time after control hand-off to
the secondary and VFB(HO) is the voltage on the FB pin at
control hand-off. The total soft-start time will be the sum
of tSS and the open-loop soft-start time prior to control
hand-off set by the LTC3765. Note that during the open-
loop soft-start time, the output voltage ramp will vary
significantly with load, since the synchronous MOSFET is
not enabled and the converter may operate in discontinu-
ous current mode. If precise control over the soft-start
time is desired, use a secondary-side bias scheme that
provides control hand-off at the lowest possible output
voltage. See above sections on generating secondary-side
bias for details.
Just prior to control hand-off, the LTC3766 rapidly pre-
sets the soft-start capacitor so that the internal soft-start
voltage is equal to VFB(HO), ensuring a smooth transition
from primary to secondary control. Due to the dielectric
absorption of the soft-start capacitor, however, the voltage
on the soft-start capacitor may droop somewhat following
the initial preset. This can result in a small step down in the
output voltage ramp after control hand-off, and an associ-
ated negative current transient in the output inductor. To
minimize this effect, use a soft-start capacitor with a low
dielectric absorption, such as an NPO ceramic capacitor.
Pulse Transformer Selection
The pulse transformer that connects the LTC3766
PT+/PT outputs to the LTC3765 IN+/IN inputs functions
VIN
VAUX
NDRV
LTC3766
VCC
CVCC
3766 F27
COW
DOW1
DOW2
NL2
SW
MAIN
XFMR
NL1
LF
NS
NP
VOW
COUT
VOUT
Figure 27. Inductor Overwinding Using Standard Parts
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
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| LTC3766IUFD#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) |
| LTC3766IUFD#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) |
| 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) |
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