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參數資料
| 型號： | NCP1215 |
| 廠商： | ON SEMICONDUCTOR |
| 英文描述： | Low Cost Variable OFF Time Switched Mode Power Supply Controller |
| 中文描述： | 低成本可變關閉時間開關電源控制器 |
| 文件頁數： | 8/16頁 |
| 文件大小： | 148K |
| 代理商： | NCP1215 |
NCP1215
http://onsemi.com
8
Figure 15. Feedback Loop Current Sense Control
FB
17 k
Current
Mirror
4:3
37.5
A
12.5
A
CS
To Current Sense Comparator
The resulting current sense regulation characteristic can
be seen from Figure 16.
Figure 16. Current Sense Regulation Characteristic
C
12.5 A
50 A
140 A
100 A
50 A
0 A
FB Pin Sink Current
When the load goes light, the compression circuitry
decreases the peak current. This has the effect of slightly
increasing the switching frequency but the compression
ratio is selected to not hamper the standby power.
OFF Time Control
The loop signal together with the internal current source,
via an external capacitor, controls the switchoff time. This
is portrayed in Figure 17.
Figure 17. OFF Time Control
+
+
CT
Voffset
10 A
From Feedback Loop Block
V
offset
to V
DD
To Latch’s Set Input
To Latch’s Output
GND
CT
During the switchON time, the CT capacitor is kept
discharged by a MOSFET switch. As soon as the latch
output changes to a low state, the voltage across CT created
by the internal current source, starts to rampup until its
value reaches the threshold given by the feedback loop
demand.
Figure 18. CT
Pin Voltage (P
out
1
P
out
2
P
out
3)
V
offset
V
DD
V
CT Pin
Voltage
P
OUT
Goes Down
P
OUT
Goes Up
t
offmin
t
P3
P2
P1
The voltage that can be observed on CT pin is shown in
Figure 18. The
bold
waveform shows the maximum output
power when the OFF time is at its minimum. The IC allows
an OFF time of several seconds.
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相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1215A | 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Power Factor Controllers |
| NCP1215AADAPGEVB | 功能描述:插座和適配器 NCP1215 5 W ADAPTER EVB RoHS:否 制造商:Silicon Labs 產品:Adapter 用于:EM35x |
| NCP1215ADR2 | 功能描述:交流/直流開關轉換器 Low Cost Variable 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 開關頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| NCP1215ADR2G | 功能描述:交流/直流開關轉換器 Low Cost Variable Off SMPS 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 開關頻率:115 kHz 電源電流:1.6 mA 工作溫度范圍:- 40 C to + 150 C 安裝風格:SMD/SMT 封裝 / 箱體:SSO-10 封裝:Reel |
| NCP1215ASNT1 | 功能描述:開關變換器、穩壓器與控制器 Low Cost Variable RoHS:否 制造商:Texas Instruments 輸出電壓:1.2 V to 10 V 輸出電流:300 mA 輸出功率: 輸入電壓:3 V to 17 V 開關頻率:1 MHz 工作溫度范圍: 安裝風格:SMD/SMT 封裝 / 箱體:WSON-8 封裝:Reel |
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