參數(shù)資料
型號(hào)： NCP1212
廠商： ON SEMICONDUCTOR
英文描述： Current Mode PWM Controller for Both Forward and Flyback Converters
中文描述： 電流模式PWM控制器正向和反激式轉(zhuǎn)換器
文件頁(yè)數(shù)： 14/22頁(yè)
文件大?。?/td> 200K
代理商： NCP1212
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
NCP1212PG Current Mode PWM Controller for Both Forward and Flyback Converters
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)間開關(guān)模式電源控制器)
NCP1215ADR2 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
NCP1212/D 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current Mode PWM Controller for Both Forward and Flyback Converters
NCP1212_05 制造商:ONSEMI 制造商全稱:ON Semiconductor 功能描述:Current Mode PWM Controller for Both Forward and Flyback Converters
NCP1212DR2 功能描述:電流型 PWM 控制器 High Performance RoHS:否 制造商:Texas Instruments 開關(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
NCP1212DR2G 功能描述:電流型 PWM 控制器 High Performance Current Mode PWM RoHS:否 制造商:Texas Instruments 開關(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
NCP1212P 功能描述:交流/直流開關(guān)轉(zhuǎn)換器 High Performance 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(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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