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參數(shù)資料
| 型號(hào)： | LM5027AMHX |
| 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 |
| 文件頁數(shù)： | 8/28頁 |
| 文件大?。?/td> | 561K |
| 代理商： | LM5027AMHX |
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30111908
FIGURE 6. Soft-Start Synchronous Rectifier Timing
External Over-Temperature
Protection
An external set-point voltage divider between the REF, OTP,
and AGND pins, as shown in Figure 7, is one method to im-
plement over-temperature protection shutdown. Typically a
NTC thermistor is installed as the lower device of the voltage
divider. The divider must be designed such that the voltage
at the OTP pin will be greater than 1.25V when there is not
an over-temperature condition, and the OTP pin must drop
below 1.25V during an over-temperature event. OTP hystere-
sis is accomplished with an internal 20 A current source that
is switched on or off into the impedance of the external set-
point divider. When the OTP pin voltage exceeds 1.25V
threshold, the current source is activated to quickly raise the
voltage at the OTP pin. When the OTP pin voltage falls below
the 1.25V threshold, the current source is turned off causing
the voltage at the OTP pin to quickly fall. When OTP falls be-
low 1.25V the LM5027A will go through a soft-stop turn-off
sequence.
30111909
FIGURE 7. External OTP Protection
Fault/Events Summary Table
Table 1 is a Truth Table which describes the faults and events
that control the LM5027A drive outputs. For example the first
event is with UVLO being pulled below 0.4V, a possible re-
mote shutdown condition. When this occurs the SS, and
SSSR capacitors are discharged, and the three drive outputs
will stop switching (outputs low). The last fault is if the OTP
pin is pulled low <1.25V, this would occur if an OTP protection
circuit is used, see Figure 7. In an OTP event, the LM5027A
goes into a soft-stop shutdown.
www.national.com
16
LM5027A
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LM5027MH/NOPB | 功能描述:電壓模式 PWM 控制器 Voltage Mode Active Clamp Controller 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 |
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