LM5021 AC-DC current mode PWM controller | TI.com

LM5021
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AC-DC current mode PWM controller

AC-DC current mode PWM controller - LM5021
Datasheet
 

Description

The LM5021 off-line pulse width modulation (PWM) controller contains all of the features needed to implement highly efficient off-line single-ended flyback and forward power converters using current-mode control. The LM5021 features include an ultra-low (25 µA) start-up current, which minimizes 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, and so forth). Additional features include under-voltage lockout, cycle-by-cycle current limit, hiccup mode overload protection, slope compensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total propagation delays less than 100 ns and a 1-MHz capable oscillator that is programmed with a single resistor.

Features

  • Ultra Low Start-up Current (25 µA maximum)
  • Current Mode Control
  • Skip Cycle Mode for Low Standby Power
  • Single Resistor Programmable Oscillator
  • Synchronizable Oscillator
  • Adjustable Soft-Start
  • Integrated 0.7 A Peak Gate Driver
  • Direct Opto-Coupler Interface
  • Maximum Duty Cycle Limiting (80% for LM5021-1
    or 50% for LM5021-2)
  • Slope Compensation (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: VSSOP-8 or PDIP-8

WEBENCH ® Designer LM5021

  Min   Max Range
Vin -  V 85 to 500V
Product Option
Vout  V 3.3 to 48V
Iout  A ≤ 5A
Ambient Temp   °C -40 to 125 °C

Parametrics

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Part number Order Control method Duty cycle (Max) (%) Frequency (Max) (kHz) UVLO thresholds on/off (V) Features Operating temperature range (C) Package Group Rating Package size: mm2:W x L (PKG)
LM5021 Order now Secondary-side regulation     80     1000     20/7.25     SSR
DCM
CCM
Frequency Synchronization    
-40 to 125     PDIP | 8
VSSOP | 8    
Catalog     8PDIP: 93 mm2: 9.43 x 9.81 (PDIP | 8)
8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)    
LM5021-Q1 Order now Secondary-side regulation     80     1000     20/7.25     SSR
DCM
CCM
Frequency Synchronization    
-40 to 125     VSSOP | 8     Automotive     8VSSOP: 15 mm2: 4.9 x 3 (VSSOP | 8)