參數(shù)資料
型號(hào)： LTC3765IMSE#TRPBF
廠商： LINEAR TECHNOLOGY CORP
元件分類： 電源管理
英文描述： 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16
封裝： LEAD FREE, PLASTIC, MSOP-16
文件頁(yè)數(shù)： 8/24頁(yè)
文件大?。?/td> 265K
代理商： LTC3765IMSE#TRPBF
LTC3765
16
3765f
APPLICATIONS INFORMATION
The internal oscillator generates a ramp that is compared
with the voltage on the SSFLT pin to generate a duty cycle.
The internal oscillator has an offset that prevents switch-
ing until SSFLT reaches approximately 1V. When VCC is
undervoltage or the RUN pin is below its threshold, the
SSFLT pin is internally grounded and the drivers therefore
do not switch.
When start-up conditions have been met, the SSFLT pin is
released and a current is sourced out of the pin to charge
an external capacitor connected from SSFLT to ground.
Initially, a 60A current is sourced out of the pin; how-
ever, this current is reduced to approximately 4A when
PG begins switching. The 60A initial current reduces
delay due to charging the external capacitor to 1V, where
switching begins.
During the open-loop start-up, the output voltage rises
much more quickly at high line than at low line for a given
duty cycle ramp rate. This has the potential to overvolt-
age the output before the LTC3766 has begun switching,
particularly at no load. To avoid this situation, the 4A
soft-start current is modulated by the RUN pin voltage,
which monitors VIN through a resistive divider. When the
RUN pin voltage increases from 1.3V to 3.75V, the soft-
start current decreases from 4A to 1.6A.
As the external soft-start capacitor gradually charges from
1V to 3V, the duty cycle increases linearly from 0% to 70%.
For SSFLT voltages above 3V, the duty cycle is clamped at
approximately70%toallowforadequateactiveclampreset
time. When the SSFLT voltage reaches 3.5V, the voltage
is held and the linear regulator is turned off. The PG and
AG gate drivers will continue to switch at 70% duty cycle
and the VCC supply will decrease until it reaches its falling
undervoltagelockoutthreshold.Atthatpoint,theLTC3765
will fault, turn on the linear regulator, and gradually reset
the SSFLT capacitor for a restart attempt.
In most applications, the LTC3766 is biased from a peak
charge circuit from an auxiliary winding of the main
transformer. This configuration is shown in Figure 6. Since
the LTC3765 open-loop start-up powers both the peak
charge circuit and the output voltage, the primary design
constraint on the soft-start capacitor value is to ensure
that the output does not overvoltage before the LTC3766
has adequate bias to take control. A good rule of thumb
is to select the soft-start capacitor so that the LTC3766
has adequate supply voltage before the output voltage has
risen to half of its regulation point.
For the peak charge circuit of Figure 6, choose the value of
CPKbasedonthecapacitancerequiredtobiastheLTC3766.
ThenchoosetheauxiliarywindingturnsratioNA/NPtogive
a peak charge voltage at minimum VIN of approximately
30% more than the required VCC of the LTC3766.
Figure 6. Peak Charge Circuit for Biasing the LTC3766
in a Self-Starting Application
PG
NP
NS
NA
VOUT
VIN
COUT
L
3765 F06
FG NMOS
BODY DIODE
SG NMOS
BODY DIODE
LTC3766 VAUX
CPK
DPK
RPK
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LTC3765MPMSE#PBF 功能描述:IC CONTROLLER GATE DR 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™ 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)
LTC3765MPMSE#TRPBF 功能描述:IC CONTROLLER GATE DR 16MSOP RoHS:是 類別:集成電路 (IC) >> PMIC - 電源控制器，監(jiān)視器 系列:Direct Flux Limit™ 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)
LTC3766EGN#PBF 功能描述:IC CONTROLLER SYNCH 28-SSOP 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)
LTC3766EGN#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)
LTC3766EUFD#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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