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| 型号： | LM5021NA-2/NOPB |
| 厂商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分类： | 稳压器 |
| 英文描述： | 0.7 A SWITCHING CONTROLLER, 560 kHz SWITCHING FREQ-MAX, PDIP8 |
| 封装： | LEAD FREE, PLASTIC, DIP-8 |
| 文件页数： | 1/15页 |
| 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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