參數(shù)資料
型號(hào)： LM5027AMH
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 穩(wěn)壓器
英文描述： SWITCHING CONTROLLER, 1000 kHz SWITCHING FREQ-MAX, PDSO20
封裝： TSSOP-20
文件頁(yè)數(shù)： 5/28頁(yè)
文件大?。?/td> 561K
代理商： LM5027AMH
the voltage at the RES pin to gradually increase. If the RES
voltage reaches the 1.0V threshold, the following restart se-
quence occurs (also see Figure 2).
The SS and SSSR capacitors are fully discharged.
The RES 20 A current source is turned-off and the 5 A
current source is turned-on.
The voltage on the RES pin is allowed to charge up to 4.0V.
When voltage on the RES pin reaches 4.0V the 5 A current
source is turned-off and a 5 A current sink is turned-on,
ramping the voltage on the RES capacitor down to 2.0V.
The RES capacitor voltage is ramped between 4.0V and
2.0V eight times.
When the counter reaches eight, the RES pin voltage is
pulled low and the Soft-Start capacitor is released to begin a
soft-start sequence. The SS capacitor voltage slowly increas-
es. When the SS voltage reaches 1.0V, the PWM comparator
will produce the first narrow output pulse at OUTA.
When the SS voltage reaches 4.0V the capacitor on the
SSSR pin is released and is charged with a 25 A current
source, soft-starting the free-wheeling synchronous rectifier.
If the overload condition persists after restart, cycle-by-cycle
current limiting will begin to increase the voltage on the RES
capacitor again, repeating the hiccup mode sequence.
If the overload condition no longer exists after restart, the
RES pin will be held at ground by the 5 A current sink and
normal operation resumes.
30111904
FIGURE 2. Restart and Soft-Start Delay Timing
13
www.national.com
LM5027A
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LM5027AMH/NOPB 功能描述:電壓模式 PWM 控制器 Active Clamp Pwm W/3A Sr Drv RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
LM5027AMHX/NOPB 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
LM5027ASQ/NOPB 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
LM5027ASQX/NOPB 功能描述:電壓模式 PWM 控制器 RoHS:否 制造商:Texas Instruments 輸出端數(shù)量:1 拓?fù)浣Y(jié)構(gòu):Buck 輸出電壓:34 V 輸出電流: 開關(guān)頻率: 工作電源電壓:4.5 V to 5.5 V 電源電流:600 uA 最大工作溫度:+ 125 C 最小工作溫度:- 40 C 封裝 / 箱體:WSON-8 封裝:Reel
LM5027MH 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Voltage Mode Active Clamp Controller
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