收藏本站
A Product Line of
Diodes Incorporated
ZXGD3105N8
Application Information (cont.)
Functional Descriptions for Flyback Converter
The operation of the device is described step-by-step with reference to the timing diagram in Figure 3.
1. The detector stage monitors the MOSFET Drain-Source voltage.
2. When, due to transformer action, the MOSFET body diode is forced to conduct there is a negative voltage on the Drain pin due to the
body diode forward voltage.
3. As the negative Drain voltage crosses the turn-off Threshold voltage V T , the detector stage outputs a positive voltage with respect to
ground after the turn-on delay time t d(fall) . This voltage is then fed to the MOSFET driver stage and current is sourced out of the
GATE pin.
4. The controller goes into proportional gate drive control — the GATE output voltage is proportional to the MOSFET on-resistance-
induced Drain-Source voltage. Proportional gate drive ensures that MOSFET conducts during the majority of the conduction cycle to
minimize power loss in the body diode.
5. As the Drain current decays linearly toward zero, proportional gate drive control reduces the Gate voltage so the MOSFET can be
turned off rapidly at zero current crossing. The GATE voltage falls to 1V when the Drain-Source voltage crosses the detection
threshold voltage to minimize reverse current flow.
6. At zero Drain current, the controller GATE output voltage is pulled low to V G(off) to ensure that the MOSFET is off.
Figure 3 Timing diagram for a critical conduction mode Flyback converter
ZXGD3105N8
Document Number DS35101 Rev. 3 - 2
8 of 14
www.diodes.com
March 2013
? Diodes Incorporated
发布紧急采购，3分钟左右您将得到回复。

采购需求

(若只采购一条型号，填写一行即可)

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

发布成功！您可以继续发布采购。也可以进入我的后台，查看报价

*型号 *数量 厂商 批号 封装
添加更多采购

我的联系方式

*
*
*
相关PDF资料
ZXLD1100H6TA IC LED DRVR WHITE BCKLGT SC-70-6
ZXLD1101ET5TA IC LED DRVR WHITE BCKLGT SOT23-5
ZXLD1320DCATC IC LED DRVR WHITE BCKLGT 14-TDFN
ZXLD1321DCATC IC LED DRVR WHITE BCKLGT 14-TDFN
ZXLD1322DCCTC IC LED DRIVR WHITE BCKLGT 14-DFN
ZXLD1350ET5TA IC LED DRIVR WHITE BCKLGT TSOT-5
ZXLD1352ET5TA IC LED DRIVER HIGH BRIGHT TSOT-5
ZXLD1356DACTC IC LED DRIVER WHITE BCKLGT 6-DFN
相关代理商/技术参数
ZXGIF11 制造商:OMRON AUTOMATION AND SAFETY 功能描述:INTER UNIT NPN (RS232 TO BIN) 制造商:OMRON Industrial Automation 功能描述:INTER UNIT NPN (RS232 TO BIN)
ZX-GIF11 功能描述:INTER UNIT NPN (RS232 TO BIN) RoHS:是 类别:传感器，转换器 >> 配件 系列:* 标准包装:1 系列:* 其它名称:Y92EEG18T
ZXGIF11A 制造商:OMRON AUTOMATION AND SAFETY 功能描述:INTER UNIT NPN W/SETUP S/W 制造商:OMRON Industrial Automation 功能描述:INTER UNIT NPN W/SETUP S/W
ZX-GIF11A 功能描述:INTER UNIT NPN W/SETUP S/W RoHS:是 类别:传感器，转换器 >> 配件 系列:* 标准包装:1 系列:* 其它名称:Y92EEG18T
ZXGIF41 制造商:OMRON Industrial Automation 功能描述:INTER UNIT PNP (RS232 TO BIN)
ZX-GIF41 功能描述:INTER UNIT PNP (RS232 TO BIN) RoHS:是 类别:传感器，转换器 >> 配件 系列:* 标准包装:1 系列:* 其它名称:Y92EEG18T
ZXGIF41A 制造商:OMRON Industrial Automation 功能描述:INTER UNIT PNP W/SETUP S/W
ZX-GIF41A 功能描述:INTER UNIT PNP W/SETUP S/W RoHS:是 类别:传感器，转换器 >> 配件 系列:* 标准包装:1 系列:* 其它名称:Y92EEG18T