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參數(shù)資料
| 型號： | NCP1239 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low−Standby High Performance PWM Controller |
| 文件頁數(shù)： | 35/38頁 |
| 文件大?。?/td> | 1145K |
| 代理商： | NCP1239 |
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NCP1239
http://onsemi.com
35
Figure 58.
One clearly sees that the GTS signal does not react to the fugitive low FB Pin condition during startup
Figure 59.
Internal GoToStandby signal elaboration
+
Skip
+
0.43V
S
R
Q
Q
FB < V
pin7
=> Skip high
+
7
COMP1
COMP2
Stby_detect
GTS
pin1
100 ms timer (*)
(SS and timer block)
FB
15r
25r
100k
Skip
Adjust
REF5V
R1
R2
FB > 1.7 * V
pin7
=> Stby_detect RESET
(*) the 100 ms delay is programmed by the Pin 6 capacitor
Suppose our Flyback controller is built with a transformer
primary inductance of 250 H. To pass 120 W, we assume
that a peak current of 4.2 A was needed. Due to these
numbers, we can easily now when the GTS signal will be
asserted:
Lp, primary inductance = 250 H
= 85%
fsw, switching frequency = 65 kHz
Ip
2
Pout
Lp
fsw
4.2 A
Ip skip = 30% of Ip max = 1.26 A
The theoretical region at which the SMPS will enter
standby is: 1/2 * Lp * Ip * fsw *
can vary depending on the line level since the propagation
delay becomes a sensitive parameter, and on the efficiency
that is difficult to precisely predict in light load conditions.
The peak current at which the SMPS will leave standby is
48% of the peak current which means that a power of 28 W
is necessary to retrigger the PFC.
11 W. This number
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| NCP1239FDR2 | Low−Standby High Performance PWM Controller |
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| NCP1239VDR2 | Low−Standby High Performance PWM Controller |
| NCP1239VDR2G | Low−Standby High Performance PWM Controller |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1239D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Low-Standby High Performance PWM Controller |
| NCP1239F | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
| NCP1239FDR2 | 功能描述:電流型 PWM 控制器 Low Standby Power RoHS:否 制造商:Texas Instruments 開關(guān)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(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1239FDR2G | 功能描述:電流型 PWM 控制器 Low Standby Power High Performance PWM RoHS:否 制造商:Texas Instruments 開關(guān)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(shù)量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1239V | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:AC-DC Offline Switching Controllers/Regulators |
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