參數(shù)資料
型號(hào)： NCP1205
廠商： ON SEMICONDUCTOR
英文描述： Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback
中文描述： 單端PWM控制器具有名冊(cè)操作和軟頻率折返
文件頁(yè)數(shù)： 13/20頁(yè)
文件大?。?/td> 163K
代理商： NCP1205
NCP1205
http://onsemi.com
13
Figure 15. This Typical Arrangement Allows for an Easy Fault Detection Management
To illustrate how the system reacts to a variable FB level,
we have entered the above circuit into a SPICE simulator
and observed the output waveforms. When FB is within
regulation, the error flag is low. However, as soon as FB
leaves its normal operating area, the OPAMP can no longer
keep the V(–) point and either goes to the positive top or
down to zero: the error flag goes high.
Because of the large amount of delay necessary for this
128 ms operation, the capacitor used for the timing is Ct,
–
+
V(–)
Ri
50 k
–
+
+
+
+
2R
R
OCP
Circuitry
Current
Setpoint
V
fb
V
low
1.5 V
V
fb
V1
2.5 V
V
HIGH
= 3 V
V
LOW
= 5 mV
1
2
3
5
6
7
Rf
150 k
Monitor
connected from ground to pin 5. In normal VFM operation,
this timing capacitor serves as the VCO capacitor and the
error management circuit is transparent. As soon as an error
is detected (error flag goes high), an internal switch routes
Ct to the 128 ms generator. As a first effect, the switching
frequency is no longer controlled by the VCO (if the error
appears during VFM) and the system is relaxed to natural
BCM. The capacitor now ramps up and down to be further
divided and finally create the 128 ms delay.
Figure 16. By Monitoring the Internal Virtual Ground, the System can Detect the Presence of a Fault
Regulation Area
OCP Condition
Error Flag
Virtual Point
FB
1.5 V
1.000 M
3.000 M
5.000 M
7.000 M
9.000 M
6.500
4.500
2.500
500.0 M
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
NCP1205/D 制造商:未知廠家 制造商全稱(chēng):未知廠家 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback
NCP1205_06 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback
NCP1205DR2 功能描述:IC CTRLR PWM CM OVP HV 16SOIC RoHS:否 類(lèi)別:集成電路 (IC) >> PMIC - AC-DC 轉(zhuǎn)換器，離線開(kāi)關(guān) 系列:- 標(biāo)準(zhǔn)包裝:1 系列:FPS™ 輸出隔離:隔離 頻率范圍:61kHz ~ 73kHz 輸入電壓:8 V ~ 26 V 輸出電壓:650V 功率（瓦特）:12W 工作溫度:-40°C ~ 115°C 封裝/外殼:8-DIP（0.300"，7.62mm） 供應(yīng)商設(shè)備封裝:8-MDIP 包裝:Digi-Reel® 其它名稱(chēng):FSL206MRBNFSDKR
NCP1205DR2G 功能描述:電流型 PWM 控制器 Single Ended Quasi Resonant 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
NCP1205P 功能描述:電流型 PWM 控制器 Single Ended Quasi 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
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