- 您現在的位置：買賣IC網 > PDF目錄30770 > LTC3765IMSE#TRPBF (LINEAR TECHNOLOGY CORP) 1-CHANNEL POWER SUPPLY SUPPORT CKT, PDSO16 PDF資料下載
參數資料
| 型號： | 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 |
| 文件頁數： | 10/24頁 |
| 文件大小： | 265K |
| 代理商： | LTC3765IMSE#TRPBF |
LTC3765
18
3765f
APPLICATIONS INFORMATION
Alternatively,theactiveclampPMOSsourcecanbereturned
to the VCC supply bypass capacitor, as shown in Figure7b.
In this configuration, the level-shift circuit comprised of
CAG, DAG and RAG is not needed. The AG output drives the
gate of the PMOS between VCC and ground.
UnliketheconfigurationinFigure7a,themaintransformer
leakage current spike and magnetizing current return to
the VCC bypass capacitor. The VCC capacitor should be
increased to prevent excessive ripple on the supply and
a low impedance plane should be used to route VCC. The
ripple on the VCC capacitor (CVCC) due to the magnetizing
current can be approximated by the following equation:
VCC =
VOUT NP/NS
(
)
6.8 CVCC LMAG fSW2
1–
VOUT NP/NS
(
)
VIN(MAX)
In general, a 4.7F capacitor is a good choice for most
application circuits when the active clamp current is
returned to VCC.
Direct Flux Limit
In active clamp forward converters, it is essential to es-
tablish an accurate limit to the transformer flux density
in order to avoid core saturation during load transients or
when starting up into a pre-biased output. Although the
active clamp technique provides a suitable reset voltage
during steady-state operation, the sudden increase in
duty cycle caused in response to a pre-bias output or a
load step can cause the transformer flux to accumulate
or “walk,” potentially leading to saturation. This occurs
because the reset voltage on the active clamp capacitor
cannot keep up with the rapidly changing duty cycle. This
effect is most pronounced at low input voltage, where the
voltage loop demands a greater increase in duty cycle due
to the lower voltage available to ramp up the current in
the output inductor.
TheLTC3765andLTC3766implementanewuniquesystem
formonitoringanddirectlylimitingthefluxaccumulationin
the transformer core. During a reset cycle, when the active
clamp PMOS is on, the magnetizing current is sensed by
a resistor (RMAG) connected to the source of the PMOS.
The voltage across this resistor is sensed by the ISMAG
pin. Both the traditional and alternative configurations for
the active clamp driver, shown previously in Figures 7a
and 7b, are supported. In the traditional configuration, if
Figure 7a. Traditional AG and PG Driver Configuration
Figure 7b. Alternative AG and PG Driver Configuration
3765 F07a
VIN
PRIMARY
SWITCH
NMOS
ACTIVE
CLAMP
PMOS
PG
AG
MAIN
TRANSFORMER
CCLAMP
ISMAG
DAG
CAG
RAG
CSN
RSN
RMAG
3765 F07b
VIN
PRIMARY
SWITCH
NMOS
ACTIVE
CLAMP
PMOS
PG
AG
VCC
MAIN
TRANSFORMER
CCLAMP
CSN
RSN
CVCC
ISMAG
RMAG
相關PDF資料 |
PDF描述 |
|---|---|
| LTC3766IGN#PBF | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3766HGN#TRPBF | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PDSO28 |
| LTC3766HUFD#TRPBF | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3766IUFD#TRPBF | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28 |
| LTC3766MPUFD#TRPBF | SWITCHING CONTROLLER, 316 kHz SWITCHING FREQ-MAX, PQCC28 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| 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™ 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用: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 供應商設備封裝: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™ 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用: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 供應商設備封裝: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® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用: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 供應商設備封裝: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® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用: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 供應商設備封裝: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® 產品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 應用: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 供應商設備封裝:40-TQFN-EP（5x5） 包裝:帶卷 (TR) |
發(fā)布緊急采購，3分鐘左右您將得到回復。