- 您现在的位置：买卖IC网 > PDF目录4961 > LT3758EDD#PBF (Linear Technology)IC REG CTRLR BST FLYBK INV 10DFN PDF资料下载
参数资料
| 型号： | LT3758EDD#PBF |
| 厂商： | Linear Technology |
| 文件页数： | 18/36页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BST FLYBK INV 10DFN |
| 标准包装： | 121 |
| PWM 型： | 电流模式 |
| 输出数： | 1 |
| 频率 - 最大： | 1MHz |
| 电源电压： | 5.5 V ~ 100 V |
| 降压： | 无 |
| 升压： | 是 |
| 回扫： | 是 |
| 反相： | 是 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 封装/外壳： | 10-WFDFN 裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1340 (CN2011-ZH PDF) |
第1页第2页第3页第4页第5页第6页第7页第8页第9页第10页第11页第12页第13页第14页第15页第16页第17页当前第18页第19页第20页第21页第22页第23页第24页第25页第26页第27页第28页第29页第30页第31页第32页第33页第34页第35页第36页
LT3758/LT3758A
APPLICATIONS INFORMATION
The flyback converter can be designed to operate either
in continuous or discontinuous mode. Compared to con-
tinuous mode, discontinuous mode has the advantage of
smaller transformer inductances and easy loop compen-
sation, and the disadvantage of higher peak-to-average
current and lower efficiency.
to the number of variables involved. The user can choose
either a duty cycle or a turns ratio as the start point. The
following trade-offs should be considered when select-
ing the switch duty cycle or turns ratio, to optimize the
converter performance. A higher duty cycle affects the
flyback converter in the following aspects:
V IN
+
C IN
–
V SN
+
SUGGESTED
RCD SNUBBER
C SN R SN
D SN
L P
N P :N S
L S
D
I D
+
+
C OUT
–
? Lower MOSFET RMS current I SW(RMS) , but higher
MOSFET V DS peak voltage
? Lower diode peak reverse voltage, but higher diode
RMS current I D(RMS)
? Higher transformer turns ratio (N P /N S )
+
V DS
=
LT3758
GATE
SENSE
I SW
M
–
R SENSE
The choice,
D
D + D2
1
3
GND
3758 F07
Figure 7. A Simplified Flyback Converter
(for discontinuous mode operation with a given D3) gives
the power MOSFET the lowest power stress (the product
of RMS current and peak voltage). The choice,
Flyback Converter: Switch Duty Cycle and Turns Ratio
D
D + D2
=
2
3
V OUT N D
Theflybackconverterconversionratiointhecontinuous
mode operation is:
= S ?
V IN N P 1 ? D
Where N S /N P is the second to primary turns ratio.
Figure 8 shows the waveforms of the flyback converter
in discontinuous mode operation. During each switching
period T S , three subintervals occur: DT S , D2T S , D3T S .
During DT S , M is on, and D is reverse-biased. During
D2T S , M is off, and L S is conducting current. Both L P and
L S currents are zero during D3T S .
(for discontinuous mode operation with a given D3) gives
the diode the lowest power stress (the product of RMS
current and peak voltage). An extreme high or low duty
cycle results in high power stress on the MOSFET or diode,
and reduces efficiency. It is recommended to choose a
duty cycle between 20% and 80%.
V DS
I SW
The flyback converter conversion ratio in the discontinu-
ous mode operation is:
I D
I SW(MAX)
= S ?
V OUT
V IN
N D
N P D2
I D(MAX)
T S
Accordingtotheprecedingequations,theuserhasrelative
freedom in selecting the switch duty cycle or turns ratio to
suit a given application. The selections of the duty cycle
and the turns ratio are somewhat iterative processes, due
DT S D2T S D3T S t
3758 F08
Figure 8. Waveforms of the Flyback Converter
in Discontinuous Mode Operation
3758afd
18
相关PDF资料 |
PDF描述 |
|---|---|
| LTC3850EGN#PBF | IC REG CTRLR BUCK PWM CM 28-SSOP |
| RCA24DTMH | CONN EDGECARD 48POS R/A .125 SLD |
| AHA475M2AE16B-F | CAP ALUM 4.7UF 100V 20% SMD |
| GMM36DSXI | CONN EDGECARD 72POS DIP .156 SLD |
| RCA24DTMD | CONN EDGECARD 48POS R/A .125 SLD |
相关代理商/技术参数 |
参数描述 |
|---|---|
| LT3758EDDTRPBF | 制造商:LINER 制造商全称:Linear Technology 功能描述:High Input Voltage, Boost, Flyback, SEPIC and Inverting Controller |
| LT3758EMSE#PBF | 功能描述:IC REG CTRLR PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 特色产品:LM3753/54 Scalable 2-Phase Synchronous Buck Controllers 标准包装:1 系列:PowerWise® PWM 型:电压模式 输出数:1 频率 - 最大:1MHz 占空比:81% 电源电压:4.5 V ~ 18 V 降压:是 升压:无 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-5°C ~ 125°C 封装/外壳:32-WFQFN 裸露焊盘 包装:Digi-Reel® 产品目录页面:1303 (CN2011-ZH PDF) 其它名称:LM3754SQDKR |
| LT3758EMSE#PBF | 制造商:Linear Technology 功能描述:DC-DC CONTROLLER INVERTING 1 制造商:Linear Technology 功能描述:DC-DC CONTROLLER, INVERTING, 1MHZ, MSOP- |
| LT3758EMSE#TRPBF | 功能描述:IC REG CTRLR PWM CM 10-MSOP RoHS:是 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 切换控制器 系列:- 标准包装:2,500 系列:- PWM 型:电流模式 输出数:1 频率 - 最大:500kHz 占空比:96% 电源电压:4 V ~ 36 V 降压:无 升压:是 回扫:无 反相:无 倍增器:无 除法器:无 Cuk:无 隔离:无 工作温度:-40°C ~ 125°C 封装/外壳:24-WQFN 裸露焊盘 包装:带卷 (TR) |
| LT3758EMSEPBF | 制造商:Linear Technology 功能描述:100V Flyback SEPIC Controller MSOP10EP |
发布紧急采购，3分钟左右您将得到回复。