数据搜索系统,热门电子元器件搜索 |
|
UC3717AQTR 数据表(PDF) 4 Page - Texas Instruments |
|
UC3717AQTR 数据表(HTML) 4 Page - Texas Instruments |
4 / 12 page The UC3717A’s drive circuit shown in the block diagram includes the following components. (1) H-bridge output stage (2) Phase polarity logic (3) Voltage divider coupled with current sensing compa- rators (4) Two-bit D/A current level select (5) Monostable generating fixed off-time (6) Thermal protection OUTPUT STAGE The UC3717A’s output stage consists of four Darlington power transistors and associated recirculating power di- odes in a full H-bridge configuration as shown in Figure 7. Also presented, is the new added feature of inte- grated bootstrap pull up, which improves device per- formance during switched mode operation. While in switched mode, with a low level phase polarity input, Q2 is on and Q3 is being switched. At the moment Q3 turns off, winding current begins to decay through the commu- tating diode pulling the collector of Q3 above the supply voltage. Meanwhile, Q6 turns on pulling the base of Q2 higher than its previous value. The net effect lowers the saturation voltage of source transistor Q2 during recircu- lation, thus improving efficiency by reducing power dissi- pation. UC3717A Figure 6. UC3717A Test Circuit Figure 7. Simplified Schematic of Output Stage Note: Dashed lines indicate current decay paths. FUNCTIONAL DESCRIPTION 4 |
类似零件编号 - UC3717AQTR |
|
类似说明 - UC3717AQTR |
|
|
链接网址 |
隐私政策 |
ALLDATASHEETCN.COM |
ALLDATASHEET是否为您带来帮助? [ DONATE ] |
关于 Alldatasheet | 广告服务 | 联系我们 | 隐私政策 | 链接交换 | 制造商名单 All Rights Reserved©Alldatasheet.com |
Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
Family Site : ic2ic.com |
icmetro.com |