參數(shù)資料
型號(hào)： NCP1212
廠商： ON SEMICONDUCTOR
英文描述： Current Mode PWM Controller for Both Forward and Flyback Converters
中文描述： 電流模式PWM控制器正向和反激式轉(zhuǎn)換器
文件頁(yè)數(shù)： 18/22頁(yè)
文件大?。?/td> 200K
代理商： NCP1212
NCP1212
http://onsemi.com
18
Figure 42. Brownout Detect Waveforms
Channel 1: The MOSFET’s V
DS
Switching Waveform
Channel 2: Primary Bulk Capacitor Voltage
Channel 3: BOK Pin Voltage
Experimental results for the Brownout action were shown
in Figure 42. From the captured waveforms, it can be noted
that the Brownout Input Threshold Voltage is 1.21 V and
Brownout Hysteresis Voltage is 1.36 V at BOK pin.
4. Improving Light Load and No Load Regulation for
High Power Applications
For high power applications, limited by the dynamic
range of the control circuitry, i.e. the control
feedback is limited by the swing of the optocoupler.
When V
FB
reaches about 0.1 V at light load
conditions, it no longer has the means to further
reduce that voltage because of the saturation of the
optocoupler. At light load or no load conditions, the
primary current is very small and as the current
sensing resistor is also small for high power
applications, the current sense feedback voltage will
be much smaller than 0.1 V. Consequently, the
control will force to acquire maximum Duty Cycle
operation and the output will increase without
control.
In order to improve the poor regulation at light load,
a small circuit is added as shown in Figure 43. With
the additional circuitry, when V
FB
falls below 0.1 V,
Q2 will drive additional offset current to CS pin and
modify the current sensing voltage, V
CS
. For V
FB
higher than 0.1 V at normal load operation, Q2 will
be turned off due to limited V
be.
相關(guān)PDF資料
PDF描述
NCP1212PG Current Mode PWM Controller for Both Forward and Flyback Converters
NCP1212DR2 Current Mode PWM Controller for Both Forward and Flyback Converters
NCP1212P Current Mode PWM Controller for Both Forward and Flyback Converters
NCP1215(中文) Low Cost Variable OFF Time Switched Mode Power Supply Controller(低成本可變關(guān)閉時(shí)間開(kāi)關(guān)模式電源控制器)
NCP1215ADR2 Low Cost Variable OFF Time Switched Mode Power Supply Controller
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NCP1212/D 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Current Mode PWM Controller for Both Forward and Flyback Converters
NCP1212_05 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:Current Mode PWM Controller for Both Forward and Flyback Converters
NCP1212DR2 功能描述:電流型 PWM 控制器 High Performance RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1212DR2G 功能描述:電流型 PWM 控制器 High Performance Current Mode PWM RoHS:否 制造商:Texas Instruments 開(kāi)關(guān)頻率:27 KHz 上升時(shí)間: 下降時(shí)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(shù)量:1 最大工作溫度:+ 105 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TSSOP-14
NCP1212P 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)換器 High Performance RoHS:否 制造商:STMicroelectronics 輸出電壓:800 V 輸入/電源電壓（最大值）:23.5 V 輸入/電源電壓（最小值）:11.5 V 開(kāi)關(guān)頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel
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