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參數資料
| 型號： | NCP1381 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low−Standby High Performance PWM Controller |
| 文件頁數： | 16/26頁 |
| 文件大小： | 559K |
| 代理商： | NCP1381 |
NCP1381
http://onsemi.com
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Figure 22. Plateau Sensing Overvoltage Protection
Figure 23. Typical Sensed Waveforms
TIME ( S)
I
P
T
samp
58.5
62.5
66.5
70.4
74.4
+
V
latchdem
Latch
Input
To Demag
Comp.
DRV
Demag
1 Shot
Timer
+
External Latchoff
By lifting up Pin 5 above V
latch
(3.5 V typical), the circuit
is permanently latched. That is to say, Pin 9 goes low, the
GTS pin no longer supplies the PFC and the V
CC
is clamped
to 6 V. The latch reset occurs when V
CC
falls below 4 V, e.g.
when the user unplugs the converter from the mains.
Figure 24 shows several options on how to connect a PNP
to implement an OVP or Overtemperature Protection
(OTP).
Figure 24. Wiring a PNP Transistor on the Skip Cycle Input Pin will Latch the Circuit.
+
V
latch
Skip
NTC
Latch
V
max
< 5 V!
V
ref
OVP
V
ref
+
Skip
+
Latch
OVP
Skip
V
latch
+
Keep in mind that the 5 V maximum limit on all low
voltage pins implies some precaution when triggering the
latch voltage. The cheapest option is obtained when wiring
a simple zener diode in series with the monitored line. Care
must be taken to limit the excursion of the skip pin before
fully latching the controller.
GoToStandby detection
The PFC frontend stage delivers an elevated voltage to
the Flyback converter and keeps the mains power factor
close to unity. However, in standby, this PFC stage is no
longer needed and must be turned off to save watts and thus
reduce the noload standby power. To detect when the
converter enters standby, the controller observes the voltage
available on Pin 1: typically, a portion of the feedback
voltage will be used. In higher power conditions, this level
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相關代理商/技術參數 |
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| NCP1381 AM90 WAF | 制造商:ON Semiconductor 功能描述: |
| NCP1381ADAPEVB | 功能描述:BOARD EVAL NCP1381 RoHS:是 類別:編程器，開發系統 >> 評估演示板和套件 系列:* 標準包裝:1 系列:PCI Express® (PCIe) 主要目的:接口，收發器，PCI Express 嵌入式:- 已用 IC / 零件:DS80PCI800 主要屬性:- 次要屬性:- 已供物品:板 |
| NCP1381DR2G | 功能描述:電流型 PWM 控制器 ANA PWM CONTROLLER RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1382DR2G | 功能描述:電流型 PWM 控制器 L-STNDBY PWM CNTRLR RoHS:否 制造商:Texas Instruments 開關頻率:27 KHz 上升時間: 下降時間: 工作電源電壓:6 V to 15 V 工作電源電流:1.5 mA 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1392B | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:High-Voltage Half-Bridge Driver with Inbuilt Oscillator |
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