- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄363215 > NCP1200AP100G (ON SEMICONDUCTOR) PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power PDF資料下載
參數(shù)資料
| 型號(hào)： | NCP1200AP100G |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| 中文描述： | 0.25 A SWITCHING CONTROLLER, 114 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 8/16頁(yè) |
| 文件大?。?/td> | 136K |
| 代理商： | NCP1200AP100G |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)當(dāng)前第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)
NCP1200A
http://onsemi.com
8
Figure 16. A simple diode naturally reduces the average voltage on pin 8
8
7
6
5
1
2
3
4
mains
Cbulk
HV
Skipping Cycle Mode
The NCP1200A automatically skips switching cycles
when the output power demand drops below a given level.
This is accomplished by monitoring the FB pin. In normal
operation, pin 2 imposes a peak current accordingly to the
load value. If the load demand decreases, the internal loop
asks for less peak current. When this setpoint reaches a
determined level, the IC prevents the current from
decreasing further down and starts to blank the output
pulses: the IC enters the socalled skip cycle mode, also
named controlled burst operation. The power transfer now
depends upon the width of the pulse bunches (Figure 18).
Suppose we have the following component values:
Lp, primary inductance = 1 mH
F
SW
, switching frequency = 61 kHz
Ip skip = 200 mA (or 333 mV/R
SENSE
)
The theoretical power transfer is therefore:
1
2
If this IC enters skip cycle mode with a bunch length of
20 ms over a recurrent period of 100 ms, then the total
power transfer is: 1.2
.
0.2 = 240 mW.
Lp
Ip
2
FSW
1.2 W
To better understand how this skip cycle mode takes place,
a look at the operation mode versus the FB level
immediately gives the necessary insight:
Figure 17.
SKIP CYCLE OPERATION
I
P(min)
= 333 mV/R
SENSE
NORMAL CURRENT
MODE OPERATION
FB
1 V
4.2 V, FB Pin Open
3.2 V, Upper
Dynamic Range
When FB is above the skip cycle threshold (1 V by
default), the peak current cannot exceed 1 V/R
SENSE
. When
the IC enters the skip cycle mode, the peak current cannot go
below Vpin1 / 3.3. The user still has the flexibility to alter
this 1 V by either shunting pin 1 to ground through a resistor
or raising it through a resistor up to the desired level.
Grounding pin 1 permanently invalidates the skip cycle
operation.
Power P1
Power P2
Power P3
Figure 18. Output Pulses at Various Power Levels (X = 5.0 s/div) P1
P2
P3
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| NCP1200AP40 | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200AP40G | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200AP60 | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200AP60G | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
| NCP1200D | PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| NCP1200AP40 | 功能描述:IC CTRLR PWM CM HV 8DIP RoHS:否 類別: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:FSL206MRBNFSDKR |
| NCP1200AP40G | 功能描述:IC CTRLR PWM CM HV 8DIP RoHS:是 類別: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:FSL206MRBNFSDKR |
| NCP1200AP60 | 功能描述:IC CTRLR PWM CM HV 8DIP RoHS:否 類別: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:FSL206MRBNFSDKR |
| NCP1200AP60G | 功能描述:IC CTRLR PWM CM HV 8DIP RoHS:是 類別: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:FSL206MRBNFSDKR |
| NCP1200D | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:PWM Current-Mode Controller for Universal Off-Line Supplies Featuring Low Standby Power |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。