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LM5021 Datasheet(PDF) 1 Page - Texas Instruments |
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LM5021 Datasheet(HTML) 1 Page - Texas Instruments |
1 / 23 page VOUT VIN CS SS OUT FEEDBACK WITH ISOLATION COMP GND RT VCC LM5021 90 ~ 264 Vac + + AC LM5021 www.ti.com SNVS359D – MAY 2005 – REVISED MARCH 2013 LM5021 AC-DC Current Mode PWM Controller Check for Samples: LM5021 1 FEATURES DESCRIPTION The LM5021 off-line pulse width modulation (PWM) 2 • Ultra Low Start-up Current (25 µA maximum) controller contains all of the features needed to • Current Mode Control implement highly efficient off-line single-ended • Skip Cycle Mode for Low Standby Power flyback and forward power converters using current- mode control. The LM5021 features include an ultra- • Single Resistor Programmable Oscillator low (25 µA) start-up current, which minimizes power • Synchronizable Oscillator losses in the high voltage start-up network. A skip • Adjustable Soft-Start cycle mode reduces power consumption with light loads for energy conserving applications (ENERGY • Integrated 0.7A Peak Gate Driver STAR®, CECP, etc.). Additional features include • Direct Opto-Coupler Interface under-voltage lockout, cycle-by-cycle current limit, • Maximum Duty Cycle Limiting (80% for hiccup mode overload protection, slope com- LM5021-1 or 50% for LM5021-2) pensation, soft-start and oscillator synchronization capability. This high performance 8-pin IC has total • Slope Compensation for (LM5021-1 Only) propagation delays less than 100nS and a 1MHz • Under Voltage Lockout (UVLO) with Hysteresis capable oscillator that is programmed with a single • Cycle-by-Cycle Over-Current Protection resistor. • Hiccup Mode for Continuous Overload WHITE SPACE Protection • Leading Edge Blanking of Current Sense Signal • Packages: VSSOP-8 or PDIP-8 Simplified Application Diagram 1 Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. 2 All trademarks are the property of their respective owners. PRODUCTION DATA information is current as of publication date. Copyright © 2005–2013, Texas Instruments Incorporated Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. |
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