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參數資料
| 型號： | LM5026SD |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | Active Clamp Current Mode PWM Controller |
| 中文描述： | 3 A SWITCHING CONTROLLER, 660 kHz SWITCHING FREQ-MAX, DSO16 |
| 封裝： | 5 X 5 MM, EXPOSED PAD, LLP-16 |
| 文件頁數： | 18/23頁 |
| 文件大小： | 936K |
| 代理商： | LM5026SD |
Applications Information
(Continued)
HICCUP MODE CURRENT LIMIT RESTART (RES)
The basic operation of the hiccup mode current limit restart
is described in the functional description. The delay time to
restart is programmed with the selection of the RES pin
capacitor C
RES
as illustrated in
Figure 7
. In the case of
continuous cycle-by-cycle current limit detection at the CS
pin, the time required for C
RES
to reach the 2.5V hiccup
mode threshold is:
For example, if C
RES
= 0.01 μF the time t1 is approximately
2.5 ms.
The cool down time, t2 is set by the soft-start capacitor (C
SS
)
and the internal 1 μA SS current source, and is equal to:
If C
SS
= 0.01 μF, t2 is
≈
14 ms.
The soft-start time t3 is set by the internal 50 μA current
source, and is equal to:
20147926
FIGURE 15. Current Sense Using a Current Sense Transformer
20147927
FIGURE 16. Current Sense Using a Source Sense Resistor (R1)
L
www.national.com
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LM5026SD/NOPB | 功能描述:電流型 PWM 控制器 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 |
| LM5026SDX | 功能描述:電流型 PWM 控制器 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 |
| LM5026SDX/NOPB | 功能描述:電流型 PWM 控制器 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 |
| LM5027 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Voltage Mode Active Clamp Controller |
| LM5027A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Evaluation Board evaluation board is designed to provide |
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