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)： 13/24頁(yè)
文件大?。?/td> 265K
代理商： LTC3765IMSE#TRPBF
LTC3765
20
3765f
APPLICATIONS INFORMATION
In a resonant reset application, the active clamp is re-
placed by a single reset capacitor. In this configuration,
the transformer core is reset every cycle and is less likely
to saturate; however, the transformer can still saturate
during certain transient conditions. The Direct Flux Limit
can also be configured to prevent core saturation in this
application. Connect the RMAG sense resistor in series
with the ground side of the resonant reset capacitor and
use the equation above for RCORE to prevent saturation
in a forward converter with resonant reset. The Direct
Flux Limit may be disabled by tying ISMAG to ground and
floating the RCORE pin; however, disabling the Direct Flux
Limit leaves the application circuit open to transformer
saturation and is not recommended.
Active Clamp Capacitor
Theactiveclampcapacitor,CCLAMP,storestheaveragereset
voltageofthetransformerovermanycycles.Thevoltageon
the clamp capacitor is generated by the transformer core
reset current, and will intrinsically adjust to the optimal
reset voltage regardless of other parameters. The voltage
across the capacitor at full load is approximately given by:
VCL =
VIN2
VIN –1.15 VOUT NP/NS
(
)
NP/NS is the main transformer turns ratio. The factor of
1.15 accounts for typical losses and delays. When PG
and AG are low, the bottom side of the clamp capacitor is
grounded, placing the reset voltage VCL on the SWP node
in Figure 1. When PG and AG are high, the topside of the
capacitor is grounded, and the voltage on the bottom side
of the capacitor is –VCL. Therefore the voltage seen on the
capacitor is also the voltage seen at the drains of the PG
and AG MOSFETs.
AsshowninFigure8,theVCLvoltagehasaminimumwhen
the converter is operating at 50%. For a given range on
VIN,therefore,themaximumclampvoltage(VCL(MAX))will
occur either at the minimum or maximum VIN, depending
on which input voltage causes the converter to operate
furthest from 50% duty cycle. The maximum VCL voltage
can be determined by substituting the maximum and
minimum values of VIN into this equation and selecting
the larger of the two. In order to leave room for overshoot,
choose a capacitor whose voltage rating is greater than
this maximum VCL voltage by 50% or more. Typically, a
good quality (X7R) ceramic capacitor is a good choice for
CCLAMP.Also,besuretoaccountforthevoltagecoefficient
ofthecapacitor.Manyceramiccapacitorswillloseasmuch
as 50% of their value at their rated voltage.
Figure 8. Active Clamp Capacitor Voltage vs Duty Cycle
DUTY CYCLE (%)
20
ACTIVE
CLAMP
VOL
TAGE
NORMALIZED
TO
50%
DUT
YCYCLE
1.3
1.4
1.5
1.2
1.1
40
60
30
50
70
80
1.0
0.9
1.6
3765 F08
相關(guān)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(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)
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

*
*
*