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LM5021NA-2 Datasheet

  • LM5021NA-2

  • AC-DC Current Mode PWM Controller

  • 15頁(yè)

  • NSC

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LM5021 AC-DC Current Mode PWM Controller
May 2005
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 碌A(chǔ)) 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
廬
,
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
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Ultra Low Start-up Current (25 碌A(chǔ) maximum)
Current Mode Control
Skip Cycle Mode for Low Standby Power
Single Resistor Programmable Oscillator
Synchronizable Oscillator
Adjustable Soft-start
Integrated 0.7A Peak Gate Driver
Direct Opto-Coupler Interface
Maximum Duty Cycle Limiting (80% for LM5021-1 or
50% for LM5021-2)
Slope Compensation for (LM5021-1 Only)
Under Voltage Lockout (UVLO) with Hysteresis
Cycle-by-Cycle Over-Current Protection
Hiccup Mode for Continuous Overload Protection
Leading Edge Blanking of Current Sense Signal
Packages: MSOP-8 or MDIP-8
Simplified Application Diagram
20144201
漏 2005 National Semiconductor Corporation
DS201442
www.national.com

LM5021NA-2 產(chǎn)品屬性

  • 1

  • 25ns

  • 10ns

  • 有

  • 通孔

  • 6.35mm

  • MDIP

  • 9.27 x 6.35 x 3.3mm

  • 有

  • 8

  • 電流

  • -40 °C

  • 50%

  • +125 °C

  • 500 kHz

  • 0.7 A

  • 9.27mm

  • 3.3mm

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