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參數(shù)資料
| 型號： | L6563A |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | 0.003 A POWER FACTOR CONTROLLER WITH POST REGULATOR, PDSO14 |
| 封裝： | LEAD FREE, SOP-14 |
| 文件頁數(shù)： | 24/39頁 |
| 文件大小： | 745K |
| 代理商： | L6563A |
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Application information
L6563 - L6563A
30/39
Figure 44. Interface circuits that let the L6563/A switch on or off a PWM controller
If this is not the case or it is not possible to achieve a start-up delay long enough (because
this prevents the DC-DC stage from starting up correctly) or, simply, the PWM controller is
devoid of soft start, the arrangement of Figure 45 lets the DC-DC converter start-up when
the voltage generated by the PFC stage reaches a preset value. The technique relies on the
UVLO thresholds of the PWM controller.
Figure 45. Interface circuits for actual power-up sequencing (master PFC)
Another possible use of the RUN and PWM_STOP pins (again, in systems where the PFC
stage is the master) is brownout protection, thanks to the hysteresis provided.
Brownout protection is basically a not-latched device shutdown function that must be
activated when a condition of mains undervoltage is detected. This condition may cause
overheating of the primary power section due to an excess of RMS current. Brownout can
also cause the PFC pre-regulator to work open loop and this could be dangerous to the PFC
stage itself and the downstream converter, should the input voltage return abruptly to its
rated value. Another problem is the spurious restarts that may occur during converter power
down and that cause the output voltage of the converter not to decay to zero monotonically.
For these reasons it is usually preferable to shutdown the unit in case of brownout.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| L6563ATR | 功能描述:功率因數(shù)校正 IC Advanced transition mode PFC controller RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6563CYTR | 制造商:ST 功能描述:ADVANCED TRANSITION-MODE PFC CONTROLLER |
| L6563H | 功能描述:功率因數(shù)校正 IC High voltage start Transition-mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6563HTR | 功能描述:功率因數(shù)校正 IC 700V 6mA Start-Up Transition-Mode PFC RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
| L6563S | 功能描述:功率因數(shù)校正 IC Transition Mode PFC 5mA 90uA 1.5% Ref RoHS:否 制造商:Fairchild Semiconductor 開關(guān)頻率:300 KHz 最大功率耗散: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Reel |
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