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參數(shù)資料
| 型號： | 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)： | 23/28頁 |
| 文件大小： | 561K |
| 代理商： | LM5027AMHX |
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Pin
Name
Description
Application Information
17
RES
Restart timer
If cycle-by-cycle current limit is reached during any cycle, a 22 A
current is sourced into the RES capacitor. If the RES capacitor voltage
charges to 1.0V, a hiccup sequence is initiated. The SS and SSSR
capacitors are discharged and the control outputs are disabled. The
voltage on the RES capacitor is ramped between 4V and 2V eight
times. After the eighth cycle, the SS capacitor is released and the
normal start-up sequence begins.
18
SSSR
Soft-start for synchronous rectifier
output.
An external capacitor and an internal 25 A current source sets the
soft-start and soft-stop ramps for the synchronous rectifier output
(OUTSR).
19
OTP
Over-Temperature Protection
The OTP comparator can be used for over-temperature shutdown
protection with an external NTC thermistor voltage divider setting the
shutdown temperature. The OTP comparator threshold is 1.25V.
Hysteresis is set by an internal current source that sources 20 A into
the external resistor divider when the OTP pin voltage is above the
threshold.
20
UVLO
Line under-voltage lockout
An external voltage divider from the power source sets the shutdown
and standby comparator levels. When UVLO reaches the 0.4V
threshold, the VCC and REF regulators are enabled. When UVLO
reaches the 2.0V threshold, the SS pin is released and the device
enters the active mode. Hysteresis is set by an internal current source
that pulls 20 A from the external resistor divider when the UVLO pin
is below the 2.0V threshold.
EP
Exposed pad, underside of package
No electrical contact to the LM5027A integrated circuit. Connect to
system ground plane for reduced thermal resistance.
Note: The pin numbers shown are only for the eTSSOP package.
www.national.com
4
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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