參數(shù)資料
型號(hào)： NCP1212PG
廠商： ON SEMICONDUCTOR
元件分類(lèi)： 穩(wěn)壓器
英文描述： Current Mode PWM Controller for Both Forward and Flyback Converters
中文描述： 1 A SWITCHING CONTROLLER, 200 kHz SWITCHING FREQ-MAX, PDIP8
封裝： LEAD FREE, PLASTIC, DIP-8
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 200K
代理商： NCP1212PG
NCP1212
http://onsemi.com
14
Figure 38. Overload Detection Block Diagram
1 V
Q
D
S
CLK
Q
D
CLK
+5 V
8 A
28 A
+
+
+
+
Current Limit
From
Current
Sense
+
OSC
Clock
CT
DMAX
Max. Duty
Cycle
48% or 82%
+
3.2 V
+
Q
S
Q
Overload Enable
Reset
+
+
0.5 V
Overload
Shutdown
SS/DMAX
Brownout Protection
NCP1212 has a builtin comparator for brownout
detection as shown in Figure 39. Positive terminal of the
comparator is connected to a +1.21 V bandgap reference.
The IC is prohibited from switching until Brownout Detect
pin exceeds 1.21 V. Once the brownout detect threshold is
exceeded, 45 A flows out of the pin and the voltage at this
pin is further pushed up to provide hysteresis effect. The
Brownout voltage setting is determined by the potential
divider formed with R
Upper
and R
Lower
. Equations to
calculate the resistors are shown below:
RUpper
RLower
(VBulk_H
VBulk_L)
45 A
RLower
[1.21 V(VBulk_H
(45 A
VBulk_L)]
VBulk_H)
Where V
Bulk_H
and V
Bulk_L
are the desired upper and
lower bulk capacitor voltage for brownout detection.
相關(guān)PDF資料
PDF描述
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
NCP1215ADR2G 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
NCP1215 制造商:ONSEMI 制造商全稱(chēng):ON Semiconductor 功能描述:Low Cost Variable OFF Time Switched Mode Power Supply Controller
NCP1215A 制造商:ONSEMI 制造商全稱(chēng):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(chǎn)品:Adapter 用于:EM35x
NCP1215ADR2 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)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(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
NCP1215ADR2G 功能描述:交流/直流開(kāi)關(guān)轉(zhuǎn)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(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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