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)： 1/28頁
文件大小： 561K
代理商： LM5027AMHX
LM5027A
July 19, 2010
Voltage Mode Active Clamp Controller
General Description
The LM5027A is a functional variant of the LM5027 active
clamp PWM controller. The functional difference of the
LM5027A is that the maximum duty cycle of the LM5027A is
decreased from 91% to 71%. In addition, the oscillator timing
equation has been modified.
The LM5027A pulse-width modulation (PWM) controller con-
tains all of the features necessary to implement power con-
verters utilizing the Active Clamp / Reset technique. With the
active clamp technique, higher efficiencies and greater power
densities can be realized compared to conventional catch
winding or RDC clamp / reset techniques. Three control out-
puts are provided: the main power switch control (OUTA), the
active clamp switch control (OUTB), and secondary side syn-
chronous rectifier control (OUTSR). The timing between the
control outputs is adjustable with external resistors that pro-
gram internal precision timers. This controller is designed for
high-speed operation including an oscillator frequency range
up to 1 MHz and total PWM propagation delays less than 50
ns. The LM5027A includes a high-voltage startup regulator
with a maximum input voltage rating of 105V. Additional fea-
tures include Line Under Voltage Lockout (UVLO), separate
soft-start of main and synchronous rectifier outputs, a timer
for hiccup mode current limiting, a precision reference, and
thermal shutdown.
Features
■ Voltage-Mode control
■ Line feed-forward PWM ramp
■ Internal 105V rated start-up bias regulator
■ Programmable line Under-Voltage Lockout (UVLO) with
adjustable hysteresis
■ Versatile dual mode over-current protection
■ Programmable volt-second limiter and soft-start
■ Programmable synchronous rectifier soft-start and stop
■ Precise 500mV over-current comparator
■ Current sense leading edge blanking
■ Programmable oscillator with 1 MHz maximum frequency
and synchronization capability
■ Precision 5V reference
■ Programmable time delays between outputs
■ A 70% maximum duty cycle
Packages
■ eTSSOP-20
■ LLP-24
Typical Application Circuit
30111901
Simplified Active Clamp Converter
2010 National Semiconductor Corporation
301119
www.national.com
LM5027A
Voltage
Mode
Active
Clamp
Controller
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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 拓撲結(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 拓撲結(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 拓撲結(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 拓撲結(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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