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參數資料
| 型號： | NCP1205DR2 |
| 廠商： | ON SEMICONDUCTOR |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| 中文描述： | SWITCHING CONTROLLER, 125 kHz SWITCHING FREQ-MAX, PDSO16 |
| 封裝： | SOIC-16 |
| 文件頁數： | 13/17頁 |
| 文件大?。?/td> | 277K |
| 代理商： | NCP1205DR2 |
NCP1205
http://onsemi.com
13
Figure 14. This Typical Arrangement Allows for an Easy Fault Detection Management
+
V(
)
Ri
50 k
+
+
+
+
2R
R
OCP
Circuitry
Current
Setpoint
V
fb
V
low
1.5 V
V
fb
V1
2.5 V
V
HIGH
= 3 V
V
LOW
= 5 mV
1
2
3
5
6
7
Rf
150 k
Monitor
To illustrate how the system reacts to a variable FB level,
we have entered the above circuit into a SPICE simulator
and observed the output waveforms. When FB is within
regulation, the error flag is low. However, as soon as FB
leaves its normal operating area, the OPAMP can no longer
keep the V(
) point and either goes to the positive top or
down to zero: the error flag goes high.
Because of the large amount of delay necessary for this
128 ms operation, the capacitor used for the timing is Ct,
connected from ground to pin 5. In normal VFM operation,
this timing capacitor serves as the VCO capacitor and the
error management circuit is transparent. As soon as an error
is detected (error flag goes high), an internal switch routes
Ct to the 128 ms generator. As a first effect, the switching
frequency is no longer controlled by the VCO (if the error
appears during VFM) and the system is relaxed to natural
BCM. The capacitor now ramps up and down to be further
divided and finally create the 128 ms delay.
Figure 15. By Monitoring the Internal Virtual Ground, the System can Detect the Presence of a Fault
Regulation Area
OCP Condition
Error Flag
Virtual Point
FB
1.5 V
1.000 M
3.000 M
5.000 M
7.000 M
9.000 M
6.500
4.500
2.500
500.0 M
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| NCP1205PG | Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| NCP1205P | Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
| NCP1205P2 | Single Ended PWM Controller Featuring QR Operation and Soft Frequency Foldback |
相關代理商/技術參數 |
參數描述 |
|---|---|
| NCP1205DR2G | 功能描述:電流型 PWM 控制器 Single Ended Quasi Resonant PWM RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1205P | 功能描述:電流型 PWM 控制器 Single Ended Quasi RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1205P2 | 功能描述:電流型 PWM 控制器 Single Ended Quasi RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1205P2G | 功能描述:電流型 PWM 控制器 Single Ended Quasi Resonant PWM RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
| NCP1205PG | 功能描述:電流型 PWM 控制器 Single Ended Quasi Resonant PWM RoHS:否 制造商:Texas Instruments 開關頻率: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 輸出端數量:1 最大工作溫度:+ 105 C 安裝風格:SMD/SMT 封裝 / 箱體:TSSOP-14 |
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