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參數資料
| 型號： | LM5021NA-2/NOPB |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 穩壓器 |
| 英文描述： | 0.7 A SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封裝： | LEAD FREE, PLASTIC, DIP-8 |
| 文件頁數： | 1/15頁 |
| 文件大小： | 747K |
| 代理商： | LM5021NA-2/NOPB |
LM5021
AC-DC Current Mode PWM Controller
General Description
The LM5021 off-line pulse width modulation (PWM) control-
ler contains all of the features needed to implement highly
efficient off-line single-ended flyback and forward power con-
verters using current-mode control. The LM5021 features
include an ultra-low (25 A) start-up current, which mini-
mizes power losses in the high voltage start-up network. A
skip cycle mode reduces power consumption with light loads
for energy conserving applications (ENERGY STAR,
CECP, etc.). Additional features include under-voltage lock-
out, cycle-by-cycle current limit, hiccup mode overload pro-
tection, slope compensation, soft-start and oscillator syn-
chronization capability. This high performance 8-pin IC has
total propagation delays less than 100nS and a 1MHz ca-
pable oscillator that is programmed with a single resistor.
Features
n
Ultra Low Start-up Current (25 A maximum)
n
Current Mode Control
n
Skip Cycle Mode for Low Standby Power
n
Single Resistor Programmable Oscillator
n
Synchronizable Oscillator
n
Adjustable Soft-start
n
Integrated 0.7A Peak Gate Driver
n
Direct Opto-Coupler Interface
n
Maximum Duty Cycle Limiting (80% for LM5021-1 or
50% for LM5021-2)
n
Slope Compensation for (LM5021-1 Only)
n
Under Voltage Lockout (UVLO) with Hysteresis
n
Cycle-by-Cycle Over-Current Protection
n
Hiccup Mode for Continuous Overload Protection
n
Leading Edge Blanking of Current Sense Signal
n
Packages: MSOP-8 or MDIP-8
Simplified Application Diagram
20144201
June 2005
LM5021
AC-DC
Current
Mode
PWM
Controller
2005 National Semiconductor Corporation
DS201442
www.national.com
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| LM5022 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:60V Low Side Controller for Boost and SEPIC |
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| LM5022EVAL | 功能描述:BOARD EVALUATION LM5022 RoHS:否 類別:編程器，開發系統 >> 評估板 - DC/DC 與 AC/DC（離線）SMPS 系列:- 產品培訓模塊:Obsolescence Mitigation Program 標準包裝:1 系列:True Shutdown™ 主要目的:DC/DC，步升 輸出及類型:1，非隔離 功率 - 輸出:- 輸出電壓:- 電流 - 輸出:1A 輸入電壓:2.5 V ~ 5.5 V 穩壓器拓撲結構:升壓 頻率 - 開關:3MHz 板類型:完全填充 已供物品:板 已用 IC / 零件:MAX8969 |
| LM5022EVAL/NOPB | 功能描述:電源管理IC開發工具 LM5022 EVAL BOARD RoHS:否 制造商:Maxim Integrated 產品:Evaluation Kits 類型:Battery Management 工具用于評估:MAX17710GB 輸入電壓: 輸出電壓:1.8 V |
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